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LEDA data base Back to CATS manual (English) (Russian) [ CATS home ] [ Back to CATS list ]


From: heinz@adel.univ-lyon1.fr (Heinz Andernach)

Lyon-Meudon Extragalactic DAtabase (LEDA) Created in 1983, LEDA is the oldest Extragalactic Database. It gives more than 60 of the most important parameters for about 100.000 galaxies. It provides charts and images through an X11 interface. In addition, a batch mode is available and also a very powerful SQL-like query language.

                   INSTRUCTIONS FOR USE                                        
                Last update: March,1994                                        
                                                                               
                                                                               
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                      HOW TO CONNECT                                           
                      ==============                                           
                                                                               
>From an INTERNET site                                                          
=====================                                                          
                                                                               
Enter :   telnet lmc.univ-lyon1.fr      (or :      telnet 134.214.4.7)         
login :   leda                                                                 
                                                                               
>From an SPAN site                                                              
=================                                                              
                                                                               
Enter :   set host ciripa                                                      
login :   lmc.univ-lyon1.fr!         (or :    login :   134.214.4.7!)          
login :   leda                                                                 
                                                                               
                                                                               
                                                                               
                         INTRODUCTION                                          
                         ============                                          
                                                                               
LEDA has been the first Extragalactic Database. It was created in 1983 at      
Lyon Observatory. Since this time, the database has been continuously       
updated. The main idea is to collect raw measurements (coming directly from    
observations) and to archive them. Mean homogenized data are calculated        
in the same spirit as those used by de Vaucouleurs et al. when publishing      
the series of Bright Galaxy Catalogues (RC1, RC2, RC3). In fact, RC3 was       
created using the LEDA database.                                               
                                                                               
Two kinds of terminal are supported: text terminal (VT100) or graphic          
terminal (X11). The second one gives access to the full on-line graphic        
capabilities. An eight-bit-color screen and a minimum of 4 Mbyte memory        
are needed.                                                                    
                                                                               
The result of any request will be sent to you via e-mail. So, please, provide  
your e-mail address carefully. You may give an alias after your e-mail         
address. This alias will be kept by the system for easier future connections.  
                                                                               
example:                                                                       
jdoe@lmc.univ.lyon1.fr  dodo                                                   
(dodo is the alias)                                                            
                                                                               
                                                                               
You will receive an ASCII file containing all information you selected         
during the connection. Charts and images will also be sent in  ASCII format    
as Postscript files. These files can be sent to a laser printer supporting     
Postscript language (Postscript is a Trade mark of Adobe Corporation).         
Note that before sending such Postscript files to your laser printer you       
must remove the heading of the e-mail message. This can be done easily         
using mail capabilities (option: w  message#  file_name). Note that, at        
certain sites blank lines have to be removed from the beginning of the         
file.                                                                          
                                                                               
When using an X11 terminal charts and images are displayed directly on the     
screen and sent as Postscript files only when the user has pushed the 'SAVE'   
button.                                                                        
                                                                               
                                                                               
                                                                               
                         DIAGRAM OF MENUS                                      
                         ================                                      
                                                                               
The structure of menus is the following in both VT100 and X11:                 
                                                                               
   MAIN MENU:  Single object      : Explore raw data                           
                                  : Explore mean data                          
               Several objects    : Select from a list of names                
                                  : SQL-like selection                         
               2D-information     : Charts                                     
                                  : Images                                     
               Information        : Instructions for use                       
                                  : News                                       
                                  : LEDA's team                                
               Exit               : Give comments                              
                                                                               
                                                                               
Except for the SQL-like option, NO PRIOR KNOWLEDGE IS NECESSARY to use LEDA    
interactively. Generally, you just have to follow on-line instructions.        
However, it could be helpful to explain how to designate an object.            
You may designate an object with:                                              
1) A Name written in a free format                                             
   (e.g.: M31 or m31 or messier 31; NGC224 or n 224 etc...)                     
2) Coordinates in a free format, for the epoch you have chosen                 
   (e.g. for R.A.: 12h30.0 or 12.5 or 12 h 30mn 0 s etc...)                     
   WARNING: Do not use e.g. '.3' but '0.3'.
3) the internal record number. This internal record number is especially       
   useful for multiple objects.                                                
   (e.g., If you ask UGC 1, LEDA gives internal record number for both         
    galaxies covered by the name UGC 1)                                        
                                                                               
Now let us give more details about two powerful options: SQL-like language     
and BATCH mode.                                                                
                                                                               
                                                                               
                                                                               
                                                                               
                         SQL-like language                                     
                         =================                                     
                                                                               
The Standard Query Language has been developed by IBM (SQL is a trade mark     
of IBM corporation). The LEDA query language  (LQL) is somewhat similar.       
The principle consists in giving a sentence which describes the request.       
The structure of this sentence is always the same:                             
                                                                               
select (parameters desired for output) where (conditions) end                  
------                                 -----              ---                  
                                                                               
The parameters you desire in the output file are simply given                  
as a list of parameter names (or a combination of them), each name being       
separated by a comma.                                                          
                                                                               
ex:  select ident1,al2000,de2000,logd25 where (conditions) end                 
     ------                             -----              ---                 
The authorized parameter names are given below.                                
                                                                               
The elementary conditions are built using operators like >, <, =, (, ) and     
operands (+,-,*,/,^ (exponent), & (exist), not(), log(), ln(), exp(), sqrt(),  
sin(), cos(), tan(), abs()).                                                   
Note that you must put character strings between apostrophes (')               
(e.g., typ='E')                                                                
                                                                               
Here are some examples:                                                        
select ident1,logd25 where (w20>200 and w20<300) end                           
select ident1 where &w20 or &w50 end                                           
select pgc,al2000,de2000 where (bt+5*logd25)<20 end                            
select pgc,al2000,de2000 where al2000<3.0 and al2000>2.0 end                   
select all where w20 > 500 and w20 < 550 end                                   
select pgc,typ where typ='E' and bt<10 end                                     
select pgc,(bt+5*logd25) where (bt+5*logd25)<20 end                            
select pgc where ring='R' and multiple='M' end                                 
select pgc,abs(w20-w50) where &w20 and &w50 and abs(w20-w50)>100 end           
select ident1 where &w20 and not(&w50) end                                     
                                                                               
The most important thing to know is the name and definition of each            
parameter. The complete list is given below and the detailed description       
of the way they were calculated is given in ANNEX B:                           
                                                                               
                                                                               
al1950     R.A. (B1950) (decimal hours)                                        
de1950     DEC. (B1950) (decimal degrees)                                      
ipad       '*' for coordinates better than 10"           *** alphabetical ***  
al2000     R.A. (J2000) (decimal hours)                                        
de2000     DEC. (J2000) (decimal degrees)                                      
l2         galactic longitude (degrees)                                        
b2         galactic latitude (degrees)                                         
sgl        supergalactic longitude (degrees)                                   
sgb        supergalactic latitude (degrees)                                    
pgc        PGC name                                         *** alphabetical **
ident1     1st name (NGC,IC,UGC,ESO...)                     *** alphabetical **
pa         position angle (N->E) in degrees                                    
typ        morphological type (e.g. 'E','Sab','SBa','SO')   *** alphabetical **
ring       'R' for Ring galaxies, otherwise ' ' (blank)     *** alphabetical **
multiple   'M' for multiple galaxies, otherwise ' ' (blank) *** alphabetical **
compact    'C' for compact, 'D' for diffuse, otherwise ' '  *** alphabetical **
t          morphological type code (-5 to 10)                                  
st         mean error on t                                                     
lc         luminosity class (1 to 11)                                          
slc        mean error on lc                                                    
logd25     log10 of isophotal diameter (d25 in 0.1')                           
slogd25    mean error on logd25                                                
logr25     log10 of the axis ratio (major/minor axis)                          
slogr25    mean error on logr25                                                
brief      effective surface brightness (mag.arcsec-2)                         
sbrief     mean error on brief                                                 
bt         total B-magnitude                                                   
sbt        mean error on bt                                                    
ubt        (U-B)T                                                              
bvt        (B-V)T                                                              
ube        (U-B)e                                                              
bve        (B-V)e                                                              
w20        21-cm line width at 20% of the peak (in km/s)                       
sw20       mean error on w20                                                   
w50        21-cm line width at 50% of the peak (in km/s)                       
sw50       mean error on w50                                                   
logs       log10 of the central velocity dispersion (s in km/s)                
slogs      mean error on logs                                                  
m21        HI-magnitude                                                        
sm21       mean error on m21                                                   
mfir       far-infrared magnitude                                              
vrad       radio heliocentric radial velocity in km/s                          
svrad      mean error on vrad                                                  
vopt       optical heliocentric radial velocity in km/s                        
svopt      mean error on vopt                                                  
v          mean heliocentric radial velocity in km/s                           
sv         mean error on v                                                     
lgg        Lyon's galaxy group number                                          
ag         galactic absorption in B-mag according to RC2                       
ai         internal absorption (in B-mag)                                      
incl       inclination (angle between line of sight and polar axis)            
a21        HI self-absorption                                                  
lambda     luminosity-index according to G. de Vaucouleurs                     
logdc      log10 of the corrected diameter (dc in 0.1')                        
btc        corrected B-magnitude                                               
ubtc       (U-B)o                                                              
bvtc       (B-V)o                                                              
bri25      mean surface brightness within 25 m/" (mag.arcsec-2)                
logvm      log10 of maximum circular rotation velocity (corrected for incl)    
m21c       corrected HI-magnitude (corrected for a21)                          
hic        HI color index                                                      
vlg        radial velocity relative to the Local Group centroid                
vgsr       radial velocity relative to the galactic Std. of rest               
vvir       radial velocity corrected for velocity infall on Virgo              
v3k        radial velocity relative to the 3K background radiation             
mucin      kinematical distance modulus (H=75 km/s/Mpc)                        
mupar      photometric distance modulus                                        
mabs       absolute B magnitude from mucin and mupar                           
                                                                               
                                                                               
For the selection:                                                             
                                                                               
select pgc,ident1,al2000,de2000,bt where (bt+5*logd25)<20 end                  
                                                                               
The output will looks like (just an extract!) :                                
 Conditions for extraction : [[bt + [5 * logd25]] < 20]                        
                                                                               
  pgc         ident1           al2000          de2000          bt              
  PGC 000006  CGCG 456- 13         0.0006         15.8814         15.3900      
  PGC 000007  MCG  0- 1- 14        0.0012         -0.0830         15.4200      
  PGC 000009  ESO   12- 11A        0.0021        -77.3376         17.3800      
  PGC 000010  MCG  0- 1- 15        0.0022         -0.0405         15.4900      
  PGC 000011  ESO   12- 11         0.0023        -77.3399         16.9000      
  PGC 000005  IC   5370            0.0025         32.7389         14.8900      
  PGC 000020  MCG  0- 1- 16        0.0044          1.1450         15.1600      
  PGC 000027  MCG -1- 1- 18        0.0060         -6.9049         14.5000      
                                                                               
                                                                               
Note that all pieces of information extracted from the SQL-like option are     
stored in a single file. Thus, avoid to make several long queries in a         
single session.                                                                
                                                                               
                                                                               
                                                                               
                         BATCH MODE                                            
                         ==========                                            
                                                                               
If you want to make a study (e.g. extract data, charts, plot on a Flamsteed    
projection) from a list of galaxy names or galaxy positions,  it is            
not necessary to keypunch these names or positions in an on-line               
connection. Just send your list of galaxy identifiers to:                      
                                                                               
LEDAMAIL@LMC.UNIV-LYON1.FR                                                     
                                                                               
You will receive in reply to your mail a file with the result.                 
Give as a Subject of the mail one of the following keywords, and follow the    
instruction for the format to use in your mail.                                
                                                                               
Subject: LIST                                                                  
--------------                                                                 
You will receive in reply to your mail a file with the main                    
parameters needed for good identification of the galaxies of your              
list. These parameters are: coordinates, alternative names, apparent           
diameter and axis ratio, apparent magnitude, radial velocity.                  
FORMAT OF YOUR MAIL : one identifier per line (Name or 1950-RA.DEC             
in free format).                                                               
EXAMPLE:                                                                       
NGC598                                                                         
121921.4+044458                                                                
UGC3615                                                                        
n224                                                                           
                                                                               
Subject: LISTALL                                                               
----------------                                                               
You will receive a file with all astrophysical parameters for your galaxies.   
The format of this file is given in 'ANNEX A' below.                           
FORMAT OF YOUR MAIL :  one identifier (Name or 1950-RA.DEC) per line.          
EXAMPLE:                                                                       
ESO122.12                                                                      
12h19m21.4s 4d44'58"                                                           
UGC5005                                                                        
                                                                               
Subject: FLAMEQ  (or FLAMGA or FLAMSG)                                         
--------------------------------------                                         
You will receive a postscript file with  an all-sky Flamsteed 
equal-area projection of your objects in either equatorial or galactic        
or supergalactic coordinates, depending on the Subject you selected.           
To print this file just send it to a laser printer with postscript             
language.                                                                      
FORMAT OF YOUR MAIL :  one identifier (Name or 1950-RA.DEC) per line.          
EXAMPLE:                                                                       
LMC                                                                            
121921.4+044458                                                                
UGC4612                                                                        
                                                                               
Subject: CHART                                                                 
--------------                                                                 
You will receive a postscript file with charts (max 20), and a corresponding   
file with data.                                                                
FORMAT OF YOUR MAIL :                                                          
-one line with an identifier (Name or 1950-RA.DEC)                             
-one line with the radius in arcmin (0=PSS or ESO scale)                       
EXAMPLE:                                                                       
me31                                                                           
0                                                                              
12 19 21.4 4 44 58                                                             
100                                                                            
(this will create two charts (in one file) : the first one centered on         
Messier 31 with the PSS scale. the second one will create a chart centered     
on the position RA1950=12h19m21.4s  DEC1950=04d44'58" with a 100' radius)      
                                                                               
                                                                               
Subject: SQL                                                                   
------------                                                                   
                                                                               
The principle consists in giving a sentence which describes the request.       
You will receive a file corresponding to the result of you request.            
See the instructions for use to learn how to use it, and to know the name      
and the description of the parameters.                                         
FORMAT OF YOUR MAIL : only one line per selection and one selection per mail.  
                                                                               
EXAMPLE:                                                                       
select ident1,logd25 where (w20>200 and w20<300) end                           
                                                                               
                                                                               
Good luck!                                                                     
If you are satisfied using LEDA, we would appreciate your quoting              
LEDA in publications you derive from it. This will encourage us to             
pursue our efforts. Thank you.                                                 
                                                                               
                                G. Paturel                                     
                                LEDA Lyon-Meudon Extragalactic Database        
                                Observatoire de Lyon                           
                                69561 Saint-Genis Laval CEDEX, France          
                                patu@lmc.univ-lyon1.fr                         
                                                                               
                                                                               
                                                                               
ACKNOWLEDGEMENTS:                                                              
=================                                                              
This database has been developed with the help of many people,                 
                                                                               
Becker M., Bottinelli L., Buta R.J., Corwin H.G.Jr., Davoust E.,               
de Vaucouleurs A., de Vaucouleurs G., Durand N., Fouque P., Garnier R.,        
Kogoshvili N., Gouguenheim L., Hallet N., Marthinet M.C.,                      
Miyauchi-Isobe N., Odewahn S., Petit C., Prugniel Ph., Andernach H.,            
Simien F., Takase B., Mamon G.                                                 
                                                                               
and the following Institutions                                                 
INSU, CNRS, DRED, Conseil Regional Rhone-Alpes, Observatoire de Lyon,          
Observatoire de Paris-Meudon, Centre de Donnees Stellaires de Strasbourg.      
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
    ANNEX A: FORMAT OF THE FILE BUILD FROM THE 'LISTALL' OPTION                
    ===========================================================                
                                                                               
NAME       FORMAT      COLUMNS    NOTE                                         
=========================================================                      
Name        a20,1x       1 - 21   Name as given by user                        
al1950      f8.5        21 - 28                                                
de1950      f8.4        29 - 36                                                
ipad       1x,a1,1x     37 - 39                                                
al2000      f8.5        40 - 47                                                
de2000      f8.4        48 - 55                                                
l2          f6.2        56 - 61                                                
b2          f6.2        62 - 67                                                
sgl         f6.2        6