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SHK: Help

SHK - Shakbazian Compact Groups of Galaxies


Overview

This catalog is a compilation of ten lists of compact groups of compact galaxies found on the Palomar Sky Survey red charts and published in the period 1973 to 1979 by Shakhbazian, Petrosian, and collaborators. The catalog contains 377 groups of compact galaxies and includes identifications, equatorial coordinates, numbers of constituent galaxies, magnitudes of the brightest member, sizes of the groups as a whole, and coefficients of relative compactness. The HEASARC has a related database table, SHKGALAXY, which contains data on the individual galaxies in the Shakhbazian Compact Groups.

Catalog Bibcodes

1973Afz.....9..495S
1974Afz....10...13S
1974Afz....10..327B
1974Afz....10..471P
1975Afz....11..221B
1976Afz....12....7B
1976Afz....12..409B
1978Afz....14..279B
1978Afz....14..631P
1979Afz....15...33B
1996yCat.7089....0S

References

Compact groups of compact galaxies
    Shakhbazian R.K.
    Astrophysics 9, 296-304 (1973)
Compact groups of compact galaxies. II.
    Shakhbazian R.K., Petrosian M.B.
    Astrophysics 10, 6-21 (1974)
Compact groups of compact galaxies. III.
    Baier F.W., Petrosian M.B., Tiersch H., Shakhbazian R.K.
    Astrophysics 10, 202-211 (1974)
Compact groups of compact galaxies. IV.
    Petrosian M.B.
    Astrophysics 10, 291-298 and Plates (1974)
Compact groups of compact galaxies. V.
    Baier F.W., Tiersch H.
    Astrophysics 11, 146-155 and Plates (1975)
Compact groups of compact galaxies. VI.
    Baier F.W., Tiersch H.
    Astrophysics 12, 1-9 and Plates (1976)
Compact groups of compact galaxies. VII.
    Baier F.W., Tiersch H.
    Astrophysics 12, 263-274 and Plates (1976)
Compact groups of compact galaxies. VIII.
    Baier F.W., Tiersch H.
    Astrophysics 14, 157-162 and Plates (1978)
Compact groups of compact galaxies. IX.
    Petrosian M.B.
    Astrophysics 14, 356-361 and Plates (1978)
Compact groups of compact galaxies. X.
    Baier F.W., Tiersch H.
    Astrophysics 15, 24-27 and Plates (1979)

Provenance

This database table was created by the HEASARC in December, 1999, based on the CDS catalog VII/89B.

Parameters

Name
The name of the Shakhbazian compact group of galaxies as constructed from the sequence number (listed in the original references and in the originating CDS Catalog) combined with the prefix `SHK' which is recommended by the Dictionary of Astronomical Nomenclature.

Alt_Name
Alternate name

RA
The right ascension of the compact group of galaxies. Notice that the co-ordinates in the original input tables were in equinox J1950, and were given to a precision of either 0.1 minutes of time (Shk 1 - 260 and 338 - 362) or 1 second of time (Shk 261 - 337 and 363 - 377).

Dec
The declination of the compact group of galaxies. Notice that the co-ordinates in the original input tables were in equinox J1950, and were given to a precision of either 1 arcminute (Shk 1 - 305 and 363 - 377), 0.1 arcminutes (Shk 338 - 362), or 1 arcsecond (Shk 306 - 337).

LII
The galactic longitude of the compact group of galaxies.

BII
The galactic latitude of the compact group of galaxies.

Number_Galaxies
The number of galaxies in the compact group: in the published lists, this number was frequently stated as a range, notice, and these ranges were apparently converted (by the authors) to their median values when the machine-readable version was created.

Brightest_Rmag
The approximate red magnitude of the brightest galaxy in the compact group. This information is provided for only about one-third of the entries in this catalog, and is given to a precision apparently ranging between 0.1 and 0.5 magnitudes.

Angular_Size
The angular size of the compact group in arcminutes.

Compactness
The coefficient of relative compactness of the group of galaxies: this coefficient is the ratio of the sum of the diameters of all the galaxies of the group to the diameter of the group as a whole. Note that this coefficient is rounded compared to the publications for objects 306 to 377.

Class
The HEASARC browse classification, based on the value of the object_type parameter, and set to `cluster of galaxies' for all entries in this catalog.


Contact Person

Questions regarding the SHK database table can be addressed to the HEASARC User Hotline.
If you have any problems, please consult the help page or mail ledas-help@star.le.ac.uk
 
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