SHKGALAXY - Shakhabazian (Shk) Compact Groups of Galaxies: Individual Galaxies Data
This catalog contains 373 groups; this number differs from the number in Shakhbazian's list (377 groups) by the following: (i) there are no data for groups 001 (already published by other authors), 206 and 241 (could not be re-identified), 252 (this is identical with 214), 301 and 353 (could not be re-identified); (ii) Group 328 was published twice (in North and South); and (iii) Group 340 was divided in two parts (340 and 340a), according to Bettoni and Fasano ([BF95]=1995AJ....109...32B).
This HEASARC version of the catalog contains a total of 3435 individual galaxies identified as members of the compact groups, 2574 from the northern part of this survey (taken from the ADS Catalog VII/196 file north.dat), and 861 from the southern part of this survey (extracted from the 10746 entries in the ADS Catalog VII/196 file south.dat by including only entries corresponding to bona fide group members).
SHK 003 = VV 153 = MCG +09-19-19a 005 = HGC 050 006 = A 1218 016 = I Zw 167, ARP 330 019 = VV 678, MCG +03-34-039 026 = A 1143 038 = III Zw 022 040 = A 0193 053 = A 1050 054 = A 1067 065 = A 1284 078 : probably stars 166 = UGC 10638, part of A 2247 191 = A 1097 219 = A 1984 233 = A 1082? 360 = A 2113 361 = A 2524 362 = III Zw 108
Some individual notes on some of the southern groups (in south.dat):
1 The objects of the group were not marked in the figure of the paper of 1 Shakhbazian (1973Afz.....9..495S, Cat. <VII/89>). So the numbering was done 1 by the authors. 2 Object Shk 30-2 seems to be a double object on both Palomar prints 3 Object Shk 30-5 is projected onto the group (Amirkhanian, 3 1989SoByu..61...25A) 4 Object Shk 30-1 has a magnitude m_V_=14.0s (Amirkhanian 1989SoByu..61...25A) 5 Object Shk 30-2 has a magnitude m_V_=14.84s (Amirkhanian 5 1989SoByu..61...25A) 6 Object Shk 30-3 has a magnitude m_V_=14.44s (Amirkhanian 6 1989SoByu..61...25A) 7 Object Shk 30-4 has a magnitude m_V_=16.04s (Amirkhanian 7 1989SoByu..61...25A) 8 Object Shk 30-6 has a magnitude m_V_=17.10s (Amirkhanian 8 1989SoByu..61...25A) 9 Object Shk 32-9 seems to be a star 10 According to the red Palomar print, object Shk 33 3 seems to be a double 10 object and so it was designated as Nr.3 and 4. 11 Object Shk 269-11 seems to be a double object (11+13) on the Palomar prints 12 Object Shk 276-10 is situated between object Shk 276-2 and Shk 276-4. It 12 cannot be distinguished on the plates of the UK Schmidt. 13 Object Shk 278-2 seems to be a double object (2+7) on the Palomar prints 14 The object (Shk 279-2, Shk 283-4, Shk 286-1) seems to be a single object on 14 the Palomar prints, but two objects can be clearly distinguisehd on the 14 plates of the UK Schmidt. 15 The object (Shk 290-7, Shk 290-21, Shk 291-11, Shk 295-4, Shk 302-9, Shk 15 312-4) cannot be found on the plates of the UK Schmidt, but may be it is a 15 mistaking on the Palomar prints. 16 Objects (Shk 292-7 and Shk 292-14; Shk 297-4 and Shk 297-10; Shk 299-6 and 16 Shk 299-12; Shk 303-7 and Shk 303-11) can be clearly distinguished on the 16 Palomar prints, but are only one object on the UKST plates. 17 Object (Shk 317-4, Shk 323-6, Shk 328-3, Shk 328-4, Shk 328-5, Shk 328-7, 17 Shk 331-6) is clearly seen on the Palomar prints, but not seen on the plates 17 of the UK Schmidt. 18 Objects Shk 334-2 and Shk 334-5 seem to be a single object on the Palomar 18 prints, but two objects can clearly be distinguished on the plates of the UK 18 Schmidt. 19 For Shk 310, in the original Baier and Tiersch chart (1978, Cat. <VII/89>) 19 there are twice #8 and 9. We named the northerly #9 as 12 and the northerly 19 #8 as 13. On the UK plates the objects #10, 11, 13 are missing.
The number of the Shakhbazian Compact Group to which the galaxy belongs.
The name of the galaxy derived by combining the Shakhbazian Compact Group number (shk), a flag (shk_flag) used to distinguish two compact groups SHK 340 and SHK 340A that are now considered to be separate entities, and the number of the galaxy in the Shakhbazian Compact Group (shk_galaxy), according to the standard astronomical nomenclature convention.
The Right Ascension of the galaxy in the specified equinox. Notice that the RA was given to a precision of 0.1 seconds of time and that the equinox was J2000 in the CDS Catalog from which the present database was constructed.
The Declination of the galaxy in the specified equinox. Notice that the Declination was given to a precision of 1 arcsecond and that the equinox was J2000 in the CDS Catalog from which the present database was constructed.
The galactic longitude of the galaxy.
The galactic latitude of the galaxy.
The origin of the quoted position; in general, the coordinates of the groups were calculated from the Digitized Sky Survey (DSS), with the northern part (north.dat groups) being derived from the Palomar Observatory Sky Survey, and the southern part (south.dat groups) being derived from COSMOS/UK Schmidt Telescope. A value of 'H' for this parameter indicates that the positions were adopted from the Hamburg Quasar Survey, while a question mark '?' indicates an inaccurate position (and more information is generally given in the note parameter.
The position angle of the major axis of the galaxy in degrees, in the usual sense, i.e, eastwards from North. In those cases where the ellipticity is zero, and hence it is not possible to define a position angle, it is set to a value of 999. Information on this parameter is available only for the southern (south.dat) groups.
A flag set to 'A' so as to distinguish two compact groups SHK 340 and SHK 340A that are now considered to be separate entities (cf. Bettoni and Fasano 1995, AJ, 109, 32).
The running number of the galaxy within the Shakhbazian Compact Group.
A Multiplicity index used for a few cases where galaxies may be split into two separate objects 'A' and 'B'.
A flag for northern galaxies which is set to a value of `S` to indicate cases where the object is probably a star rather than a galaxy.
The V-magnitude (only provided for galaxies in the north.dat sample).
The R-magnitude (only provided for galaxies in the north.dat sample).
The photographic plate system (b_j) magnitude calculated assuming the object is a galaxy (only provided for galaxies in the south.dat sample).
The photographic plate system (b_j) magnitude calculated assuming the object is a star (only provided for galaxies in the south.dat sample).
The radial velocity of the galaxy in km/sec (only provided for galaxies in the north.dat sample).
The redshift of the galaxy (only provided for galaxies in the north.dat sample). When only the radial velocity V was given in the original paper, the redshift z has been calculated using the relation z = V/299792.
The semi-major axis of the galaxy in arcminutes (only provided for galaxies in the south.dat sample).
The ellipticity (1-b/a) of the galaxy, where b is the semi-minor axis and a is the semi-major axis (only provided for galaxies in the south.dat sample).
The number of pixels within the image of the object (only provided for galaxies in the south.dat sample).
An automated classification type: 'S' for star-like image, 'G' for galaxy-like, and 'F' for faint or not classifiable (only provided for galaxies in the south.dat sample).
This field contains either a comment or note on another name, or one or more integers referring to individual notes detailed in the Notes Section of this help file.
The Browse classification of the object: all objects have been given a generic class of 'GALAXY', except for objects with a value of the parameter star_flag of 'S' which have been given a generic class of 'STAR'.