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Дата изменения: Wed Mar 18 12:25:11 2015 Дата индексирования: Sun Apr 10 00:06:21 2016 Кодировка: Поисковые слова: galaxy cluster |
The morphological catalogue of galaxies, MCG, (Vorontsov-Velyaminov et al., 1962-1968), which presently can be considered as one of the most complete galaxy catalogues, has been used as a main source of data for the merged catalogue on the magnetic tape. It has been supplied with information from the other catalogues and lists of galaxies published by 1973, such as UGC (Nilson, 1973), RCBG (de Vaucouleurs and de Vaucouleurs, 1964), CGGG catalogues (Zwicky et al., 1961-1968) and from other sources.
The arrangement of galaxies in the merged catalogue is similar to that in morphological catalogue of galaxies. The galaxies are ordered according the increase of right ascension within each of the Palomar sky atlas prints. These prints, in their turn, are arranged in accordance with increasing Right Acension within each zone having the same declination.
Data from UGC catalogue have been added to data already stored in MCG. Data for galaxies with no MCG numbers in UGC were introduced into the corresponding fields arranged by increasing right ascension.
The whole information about each galaxy consists of two parts: the main part, containing exclusively the MCG data, and the additional one, containing the data from notes given for some galaxies in MCG catalogue as well as from the other sources.
The first part includes: MCG and NGC or IC identification numbers, equatorial coordinates for the epoch of 1950.0, diameters and surface brightnesses for the internal and external areas of the galaxy, inclination and detailed morphological description of the galaxy by symbols.
The second part consists of: morphological types of the galaxy by the hubble, de Vaucouleurs, Morgan and van den Bergh's classifications, integrated colour indices, radial velocities, diameters on blue and red PA prints from UGC, position angle, its belonging to near-by clusters from cgcg catalogue, the occurrence in some lists of galaxies, radio flux densities for several wave lengths, the membership in binary or multiple systems, the interaction features, numbers of companions as well as some other parameters.
In compiling the catalogue of galaxies on the magnetic tape we aimed to retain the accepted astronomical symbols as far as possible. To facilitate the work with the computer we have had to encode certain data.
The complete morphological description of each galaxy by means of symbols according to MCG was divided into three parts to simplify the computer comparison of different descriptions of galaxies: the description of 1) general appearance of a galaxy (if the object is described in MCG by means of basic symbols); 2) the bright internal part of a galaxy; 3) the external part of a galaxy.
The description of the external part of a galaxy was carried out from the centre outwards for five similar areas with the similar structure, completely filled by symbols only when there were seen many details in the appearance of a galaxy.in the case of lack of data in the either part, the corresponding places were filled by blanks. The descriptions of galaxies are given with minimized simplification.
Magnetic tape version of the merged catalogue consists of four files. The first file contains the detailed description of the catalogue, the second one - the data concerning the galaxies, the third-bibliographical references and the fourth-detailed description of the information, encoded in the catalogue mentioned.
One of the main purposes of the merged catalogue was to record on the magnetic tape as complete information for each galaxy as possible.at the same time it turned out quite impossible to enter into the first and forth descriptive files all the symbols from MCG catalogue, because of the restricted symbolics of the computer used.
Therefore there had been worked out some main principles for storing of the whole descriptive information on the magnetic tape and particularly for recording of some of the nontrivial symbols from MCG.
There should be taken into account the expressions for some of the nontrivial symbols, used by Vorontsov-Velyaminov in MCG, e.g., for description of the spiral arms of galaxies, as seen projected in the sky, Vorontsov-Velyaminov had used two symbols s and reverse s (sometimes referred to as a cyrillic g) to define the two different directions of rotation of a galaxy. Vorontsov- Velyaminov introduces also the term branched spiral arm , represented as ss.s. and reverse ss.s. the existance of spiral arms of both directions in the same galaxy are denoted in MCG by symbols gam or s+reverse s . arrows, which were used by Vorontsov-Velyaminov for designation of the structure transitions are denoted in our case by two computer symbols -> , structure uncertainties of galaxies in MCG-by three symbols (') , the description of the structure incompleteness-by (-) , the uncertainty of morphological type of a galaxy, denoted in catalogues by square brackets, -by symbols (//) etc.
The second file consists of 31917 records for 31917 galaxies. The record length is 364 bytes. The internal computer code is ebcdic.
The author is greatly thankful to the staff of the astronomical data centre of the astronomical council of the academy of sciences of the ussr, and particularly to the department head O. B. Dluzhnevskaya, as well as to A. Piskunov and V. Semyonova, who have accomplished all the work related to the recording of the merged catalogue of galaxies from the formerly used M-220 computer codes to the ES ones.
The present catalogue is based on the following works:
1. N.G.Kogoshvili, bul. Abastum. astr. obs., 46, 1975, 133.
Catalogue of galaxies brighter than 15-th magnitude on the computer
M-220 magnetic tape.
2. N.G.Kogoshvili, coll.n 64 mas, Strasbourg, D. Reidel publ. comp., 1981, 273.
The compiled catalogue of galaxies in machine-readable form and its
statistical investigation.
columns designation units of measure ------ notes ------- 1- 11 MCG MCG identification number 1 zone sign 2- 3 zone number 5- 6 field number 8- 10 galaxy number in the field 11 component symbolic designation 13- 18 NGC/IC NGC or IC identification number 13 if NGC, then n if IC, then i a - designation for an anonymous galaxy in rcbg catalogue, otherwise blank 14- 17 galaxy number 18 component symbolic designation 20 if * , then additional information is given, otherwise blank 22- 29 alf(1950) right ascension at epoch 1950.0 22- 23 h. hours 25- 26 m. minutes 28- 29 s. seconds 31- 36 del(1950) declination at epoch 1950.0 31 sign 32- 33 degr degrees 35- 36 min arc minutes 38- 42 magn integral magnitude 44 accuracy of magnitude: coded as 1, if magnitude was reported in source catalog with accuracy to 0.01 magn as 2, if to 0.1 magn as 3, if to 1 magn 46- 47 reference for magnitude 49 symbol z is used, if a magnitude is given for two or more galaxies, otherwise blank 50 quantity of galaxies having common magnitude 52- 56 d.1(MCG) arc min angular diameters (major and minor axes) 58- 62 d.2(MCG) arc min of the galaxy bright inner part in MCG 64 id. surface brightness of galaxy inner part in the scale of MCG (ref.1) 66- 70 d1(MCG) arc min angular diameters (major and minor axes) 72- 76 d2(MCG) arc min of the whole galaxy in MCG 78 >, if d1, d2 are the lower limits of diameters (for uncertain dimensions), otherwise blank 80- 81 id surface brightness of the galaxy outward regions in the scale of MCG (ref.1) 83 i. The inclination to the line of sight in The scale of MCG (ref.1) 85- 89 d.1(UGC) arc min maximum diameters (major and minor axes) 91- 95 d.2(UGC) arc min measured on the blue Palomar sky survey blue PA prints prints from UGC (ref.10) 97-101 d.1(UGC) arc min maximum diameters (major and minor axes) 103-107 d.2(UGC) arc min measured on the red Palomar sky survey red PA prints prints from UGC (ref.10) 109 parameter, estimating the uncertainty in diameters: 0 for certain values 1 for uncertain values on the blue pa prints only 2 for uncertain values on the red pa prints only 3 for uncertain values on the blue and red pa prints 111-113 p. position angle from UGC (ref.10) 115 parameter, estimating the uncertainty in position angle: 0 for certain values 1 for uncertain values (denoted in UGC by a colon) 2 for face-on spirals (values in brackets in UGC) 3 for asymmetric systems (values in square brackets in UGC) 117-121 symbolic description of the general app.earance of a galaxy according to MCG (ref.1). See remark 1 (file 4) 123-126 symbolic description of the galaxy inner part according to MCG (ref.1). see remark 2 (file 4) 128-166 symbolic description of the galaxy outward part in MCG (ref.1) divided into five areas: 128-134 first area 136-142 second area 144-150 third area 152-158 fourth area 160-166 fifth area see remark 3 (file 4) 168 source of classification:(cc170-176) if U, then ref.10 if R, then ref.21 170-176 galaxy morphological type by de Vaucouleurs classification see remark 4 178-183 galaxy type by Morgan classification (ref.21). See remark 5 185-192 galaxy type by hubble classification according to UGC (ref.10) or by van den Bergh classification according to RCBG (ref.21).see remark 6 194 source of classification:(cc185-192) if U, then ref.10 if R, then ref.21 196-201 v km/sec/mpc radial velocity referred to the sun 196 sign of the velocity. 203-204 reference for v 206-211 v0 km/sec/mpc radial velocity corrected for solar motion 206 sign of the velocity 213-214 reference for v0 216-218 v. km/sec/kpc rotational velocity 220-224 r.h distance from the centre to the bend point on rotation curve r.h in arc min, if ref.11 r.h in kpc, if ref.12 226 >, if, r.h is the lower limit otherwise blank 228-229 reference for v. 231-232 SN 1 date of an explosion of the first supernova (two last figures of the year) 234-235 SN 2 date of an explosion of the second supernova (two last figures of the year) 237 number of supernovae observed in 239-241 number of HII regions 243-244 reference for HII regions 246-250 U-B magn integrated U-B colour 252-253 reference for U-B 255-258 B-V magn integrated B-V colour 260-261 reference for B-V 263-267 (U-B)(0) magn integrated 'face-on' (U-B)(0) colour from rcbg (ref.21) 269-272 (B-V)(0) magn integrated 'face-on' (B-V)(0) colour from rcbg (ref.21) 274-275 integral spectrum 277-280 S178 dex(-26)wt/Hz*m*m radio flux density at 178 MHz 282-283 reference for S178 285-288 S780 dex(-26)wt/Hz*m*m radio flux density at 780 MHz 290-291 reference for S780 293-296 S1400 dex(-26)wt/Hz*m*m radio flux density at 1400 MHz 298-299 reference for S1400 301-304 S2700 dex(-26)wt/Hz*m*m radio flux density at 2700 MHz 306-307 reference for S2700 309-312 S5000 dex(-26)wt/Hz*m*m radio flux density at 5000 MHz 314-315 reference for S5000 317-319 number of near-by cluster according to cgcg (ref.2) and taken from UGC (ref.10), if a galaxy is within the outline of this cluster 321 if 1 , then the galaxy is contained in ccg catalogue (ref.55) otherwise blank 323 if 1 , then the galaxy is contained in Markaryan's lists (ref.56) otherwise blank 325 if 1 , then the galaxy is contained in the catalogue of isolated galaxies by Karachentseva (ref.58) otherwise blank
1 description of the general app.earance of a galaxy according to MCG (ref.1) field structure: a b c d e a description of the general app.earance of a galaxy by means of symbols: e, p, l, f b description of various structure details coded as follows: MCG tape!MCG tape!MCG tape!MCG tape!MCG tape!MCG tape!MCG tape! a. a !i. i !o. 2 !f. f !n. 8 !t. t !b. b ! a.d. 5 !e. e !m. m !z. z !c. c !a.i. 6 !a 1 ! w. w !l. 9 !d. d !b.i. 7 !p. p !? 4 ! c the same as b d type of the faint galaxy seen in contact with the main one, or *, if a star is projected on the image of a galaxy e structure of the faint galaxy or its inclination to the line of sight. in the case of * in d there are used codes: 1 - for a star, projected on the nuclear region of a galaxy, 2 - on the outer region, 3 - a star is close-by to a galaxy, 4 - a star is possibly projected on the galaxy image 2 description of the galaxy inner bright region according to MCG (ref.1) field structure: a b c d a number of galaxy nuclei seen in contact b description of the galaxy inner region by symbols: n, l, n.. in the case of 'n.' the symbol $ is used on the tape c, d structure of a nuclear region, for () is used the code 3 3 description of the galaxy external region according to MCG (ref.1) description of the external part of a galaxy was carried out from The central regions outwards for five similar areas.for lack of information the corresponding areas were filled with blanks. field structure for one of the abovementioned similar 5 areas: a b c d e f g a area separating symbols according to MCG, coded as follows: MCG tape!MCG tape!MCG tape!MCG tape! , , !; ; !;; 1 !-> 2 ! b number of structure details described in c .in the case of b=9, b must be considered as duplication of symbols in c c description of galaxy external areas by symbols, coded as follows: MCG tape!MCG tape!MCG tape!MCG tape!MCG tape!MCG tape!MCG tape! s s !h h !b b !t t !cam 6 !r r !l. 9 ! c c !ss.s.4 !d d !l l !r. @ !s. 2 ! MCG tape!MCG tape!MCG tape! 'reverse ss.s.'3 !'reverse s.'+s.0 !'reverse s' # ! 'reverse s.' 1 !'reverse s'+s 5 !'arcs' 8 ! d, e, f description of various structure details (the same as b in remark 1), as well as the following codes: k - for a galaxy with sharp edges, x - for the traces of structure, q - for the uncertainty in The number of arms g uncertainties in structure details coded as follows: MCG tape!MCG tape!MCG tape!MCG tape!MCG tape!MCG tape!MCG tape! ' 1 !(') 4 !->r r !- 2 !->8 8 !() 3 !(-) 6 ! 4 morphological type of a galaxy by de Vaucouleurs classification according to rcbg (ref.21), or UGC (ref.10) field structure: a b c d e f g a existance of outward ring b, c, d, e galaxy type f, g peculiarities 5 type of a galaxy by Morgan's classification according to rcbg (ref.21) field structure: a b c d e f a, b, c galaxy type d, e spectral class f peculiarities 6 type of a galaxy by Hubble's classification according to UGC (ref.10), or van den Bergh's classification according to RCBG (ref.21) field structure: a b c d e f g h for the case of hubble's classification (ref.10), we have: a, b, e, f galaxy type coded as follows: UGC tape!UGC tape!UGC tape!UGC tape! e e !e0 e0 !s s !so so ! sb sb !sbo s1 !p p !ir.r. i ! dwarf 1 !dwarf s 2 !dwarf i 3 !dwarf e 4 ! dwarf p 5 ! c, g structure details coded as follows: UGC tape!UGC tape!UGC tape!UGC tape!UGC tape! a. a !b. b !a.-b.1 !c. c !b.-c.2 ! d additional symbols coded as follows: UGC tape!UGC tape!UGC tape!UGC tape!UGC tape! : : !? 1 !/ / !(//) 2 !- 3 h luminosity class for the case of van den Bergh's classification (ref.21), we have: a, b galaxy type c structure details d peculiarities, additional symbols e, f, g characteristics of spiral arms h luminosity class 7 app.earance of a galaxy in binary or multiple system field structure: a b c d a the following codes are used: 1 the galaxy has a companion with MCG identification number 2 the galaxy has a companion with no MCG identification number 3 for more than one galaxy in a system described by one MCG identification number b designation of members in binary and multiple systems 1 for the brightest member in a multiple system k for one of the fainter members in a multiple system 2 for one of the members of binary system d for another member of binary system 3 for the brightest member of triple system t for one of the fainter members of triple system c if a=1, then c=xxx (MCG number of the component in the field, positions 8-10), otherwise blank d degree of isolation of galaxy pairs according to Karachentsev (ref.57), coded as follows: ref.57 tape! ref.57 tape! ref.57 tape! ref.57 tape! +, + 1 ! -, - 2 ! +, - 3 ! -, + 4 8 existance of the interaction features field structure: a b c d e a number of the members observed in interaction b the following codes are used: if b then interaction is evident if q then interaction is suspected, otherwise blank c type of interaction, coded as follows: if 1 then galaxies are connected with a bar if 2 then a galaxy is connected with another one by a spiral arm if 3 then contact of galaxies if 4 then contact of galaxy nuclei if 5 then a nest of galaxies if 6 then a chain of galaxies if 7 then galaxies are embedded in common nebulous envelope d description of app.arent galaxy form distortion by means of codes: if 1 then existance of a tail if 2 then existance of unusual branched features (jet, streamer, plume, etc.) if 3 then a halo if 4 then clear evidence of structure distortion if 7 then galaxies are embedded in common nebulous envelope e angular separation of members in system in minutes of arc (e=x.x) 9 existance of faint components field structure: a b c d a number of faint components b the following codes are used: 1 a galaxy has a faint component with MCG identification number 2 a galaxy has a faint component with no MCG identification number 3 a galaxy has a faint galaxy close-by 4 a galaxy has a questionable object (star or defect), close-by c either MCG number of a component in the field (if b=1), or a magnitude of a nearest component (if b=2, 3, 4).c=xx d angular distance to the nearest companion in minutes of arc.d=x.x1. B.A.Vorontsov-Velyaminov, A.A.Krasnogorskaja, V.P. Arkhipova, Moscow state university, Moscow, v. 1-4, 1962, 1963, 1964, 1968, Morphological catalogue of galaxies.