Homogenization of astronomical parameters
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 then
calculated in the spirit of the famous series of Bright Galaxy
Catalogues (RC1, RC2, RC3) by de Vaucouleurs and co-workers.
In fact, RC3 was created using the LEDA database.
Examples of SQL searches
The SQL selection is very intuitive.
Some of the following examples will help you to perform
your selection :
For a reference about SQL language, see the Postgres manual (HyperLeda uses
Postgres DBMS).
Note also that the SQL request can as well be submitted with POST or
GET
methods (the latter may be particularly useful to write scripts, for
example using wget).
Calculation of homogenized astrophysical parameters.
For each parameter the method of the calculation (or the definition) is
given in the Third Reference Catalogue (de Vaucouleurs et al., 1991)
and/or in Paturel et al. (1997) and/or in some additional references given
below. The "actual uncertainty" of parameters is defined
in Paturel et al. (1997).
This table presents the references.
| Field name |
References |
| pgc |
Paturel et al., 1989,1992,1996,2000 |
| objname |
Paturel et al., 1989 |
| al1950 de1950 |
Paturel et al., 1999a, 1999b, 2000, 2000a ; Petit
2006 (unpublished)
|
| al2000 de2000 |
Merits Standards, 1983, Circ. U.S. Naval
Observatory |
| l2 b2 |
de Vaucouleurs et al., 1991 |
| sgl sgb |
de Vaucouleurs et al., 1991 |
| t st |
de Vaucouleurs et al., 1991, 1997 |
| lc |
de Vaucouleurs et al., 1991 ; Corwin (private communication) |
| slc |
Paturel et al., 1997 |
| logd25 |
Paturel et al., 2003a |
| slogd25 |
ibidem
|
| logr25 |
ibidem
|
| slogr25 |
ibidem |
| pa |
Paturel et al., 1989; Garnier et al., 1995 ; Paturel
et al., 2000
|
| brief |
Paturel et al., 1997 |
| sbrief |
Lauberts and Valentijn, 1989; Paturel et al.,
1997 |
| bt |
Paturel et al., 1994 |
| sbt |
Paturel et al., 1997 |
| ubt |
de Vaucouleurs et al., 1991 |
| bvt |
de Vaucouleurs et al., 1991 |
| ube |
de Vaucouleurs et al., 1991 |
| vdis e_vdis |
Prugniel and Simien, 1995 |
| mg2 e_mg2 |
Golev and Prugniel, 1998 |
| m21 |
de Vaucouleurs et al., 1976 ; de Vaucouleurs et al.,
1991
|
| mfir |
de Vaucouleurs et al., 1991; IRAS, 1988 |
| vrad |
Paturel et al., 2003b
|
| svrad |
ibidem
|
| vopt |
Fouqué et al., 1992 ; Paturel et al., 2003b
|
| svopt |
Fouqué et al., 1992 ; Paturel et al., 1997 ;
Paturel et al. 2003b |
| v |
Paturel et al., 1997 |
| ag |
Schlegel, Finkbeiner and Davis, 1998 |
| ai |
Bottinelli et al., 1995 |
| incl |
Heidmann et al., 1972; Bottinelli et al., 1983;
Paturel et al., 1997 |
| a21 |
Heidmann et al., 1972; de Vaucouleurs et al.,
1976 |
| lambda |
de Vaucouleurs et al., 1979 |
| logdc |
Bottinelli et al., 1995 |
| btc |
Paturel et al., 1997; Bottinelli et al., 1995
|
| ubtc |
de Vaucouleurs et al., 1991 |
| bvtc |
de Vaucouleurs et al., 1991 |
| bri25 |
de Vaucouleurs et al., 1991 |
| vrot e_vrot |
Paturel et al., 2003b
|
| m21c |
de Vaucouleurs et al., 1976; Paturel et al.,
1997 |
| hic |
Heidmann et al., 1972; de Vaucouleurs et al.,
1976 |
| vlg |
Yahil et al., 1977 |
| vgsr |
de Vaucouleurs et al., 1991 |
| vvir |
Terry J.N. et al., 2002 |
| v3k |
Lubin and Villela, 1986; de Vaucouleurs et al., 1991 |
| modz |
Makarov et al. 2011 |
| mod0 |
Makarov et al. 2011
|
| mabs |
Paturel et al., 1997 |
|
