Astronomy:HCG 2

From HandWiki
HCG 2
HCG 2 by Legacy Surveys DR10
Observation data (Epoch J2000)
Constellation(s)Pisces
Right ascension 00h 31m 30.0s
Declination+08° 25′ 52.0″
Number of galaxies4
Velocity dispersion55 km/s
Redshift0.014479
Distance
(co-moving)		192 Mly (58.9 Mpc)
Other designations
HCG 002; WBL 012; PPS2 069; HIPASS J0031+08
See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters

HCG 2 is one of the compact groups of galaxies in the Hickson Compact Group of galaxies. It is located in Pisces east of HD 2679 and is 192 million light-years away. HCG 2 is one of a hundred such groups identified by a systematic search of the Palomar Observatory Sky Survey red prints in 1982 by Paul Hickson.[1] Hickson Compact Group 2 has a velocity dispersion of 55 km/s and the crossing time of HCG 2 is 0.087.[2] HCG 2 is classified as a Gas Rich Group, which studies show that UGC 00312 has many bright star forming regions, whereas MCG +01-02-018 (Mrk 552[3]) is a compact and luminous galaxy[4].

Members

HCG 2 consists of four member galaxies.[1] Their names and basic properties are listed below.[5]

Galaxy Type Right ascension Declination Diameter (Arcsec") Estimated Distance
UGC 00312[6] SB? 00h 31m 23.9041s +08° 28′ 01.287″ 102.00 193.3 Mly (59.27 Mpc)
MCG +01-02-018[7] S? 00h 31m 18.8591s +08° 28′ 30.229″ 66.00 192.5 Mly (59.02 Mpc)
UGC 00314[8] S? 00h 31m 29.3520s +08° 28′ 02.232″ 72.00 188.6 Mly (57.83 Mpc)
UGC 00315[9] SBc 00h 31m 38.3062s +08° 28′ 26.423″ 60.00 1,009.8 Mly (309.60 Mpc)

References

  1. ↑ 1.0 1.1 Hickson, P. (1982). "Systematic properties of compact groups of galaxies". Astrophysical Journal 255: 382. doi:10.1086/159838. Bibcode: 1982ApJ...255..382H. 
  2. ↑ Hickson, P. (1992). "Dynamical Properties of Compact Groups of Galaxies". Astrophysical Journal 399: 353. doi:10.1086/171932. Bibcode: 1992ApJ...399..353H. 
  3. ↑ "NED results for Mrk 552". NASA/IPAC Extragalactic Database. https://ned.ipac.caltech.edu/byname?objname=Mrk+552&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  4. ↑ Johnson, K. E. (2007). "The Infrared Properties of Hickson Compact Groups". The Astronomical Journal 134: 1522. doi:10.1086/520921. Bibcode: 2007AJ....134.1522J. 
  5. ↑ "NED results for HCG 2". NASA/IPAC Extragalactic Database. https://ned.ipac.caltech.edu/byname?objname=HCG%202. 
  6. ↑ "NED results for UGC 312". NASA/IPAC Extragalactic Database. https://ned.ipac.caltech.edu/byname?objname=UGC+312&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  7. ↑ "NED results for MCG +01-02-018". NASA/IPAC Extragalactic Database. https://ned.ipac.caltech.edu/byname?objname=MCG+%2B01-02-018&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  8. ↑ "NED results for UGC 314". NASA/IPAC Extragalactic Database. https://ned.ipac.caltech.edu/byname?objname=UGC+314&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  9. ↑ "NED results for UGC 315". NASA/IPAC Extragalactic Database. https://ned.ipac.caltech.edu/byname?objname=UGC+315&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:HCG_2&oldid=4392017"