Astronomy:NGC 4492

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Short description: Spiral galaxy in the constellation Virgo
NGC 4492
NGC 4492 PanS.jpg
Pan-STARRS image of NGC 4492
Observation data (J2000 epoch)
ConstellationVirgo
Right ascension 12h 30m 59.7s[1]
Declination08° 04′ 40″[1]
Redshift0.005804/1740 km/s[1]
Distance90,950,000 ly[2][3]
Apparent magnitude (V)13.0[1]
Characteristics
TypeSA(s)a?[1]
Size~33,450 ly (estimated)[1]
Apparent size (V)1.58 x 1.25[1]
Other designations
IC 3438, PGC 41383, UGC 7656, VCC 1330[1]

NGC 4492 is a spiral galaxy[4] located about 90 million light-years away [2] in the constellation Virgo.[5] NGC 4492 was discovered by astronomer William Herschel on December 28, 1785. It was rediscovered by astronomer Arnold Schwassmann on January 23, 1900, and was listed as IC 3438.[6] NGC 4492 lies in the direction of the Virgo Cluster. However, it is not considered to be a member of that cluster.[7]

Physical characteristics

NGC 4492 has a relatively large bulge while showing signs of weak spiral structure.[7] The spiral arms are also outlined by lanes of Interstellar dust.[8]

Virgo Cluster membership

NGC 4492 is listed in the Virgo Cluster Catalog as VCC 1330.[8] However, distance estimates to the galaxy place it at a location far outside of the cluster's center.[2][7] Also, its radial velocity indicates that NGC 4492 is not gravitationally bound to the Virgo Cluster but is expanding away from it. Therefore, NGC 4492 is not a member of the Virgo Cluster but rather a background galaxy.[7]

See also

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "NASA/IPAC Extragalactic Database". Results for NGC 4492. http://nedwww.ipac.caltech.edu/. 
  2. 2.0 2.1 2.2 Carmen Toribio, M.; Solanes, Jose M. (10 November 2009). "H i DISTRIBUTION AND TULLY–FISHER DISTANCES OF GAS-POOR SPIRAL GALAXIES IN THE VIRGO CLUSTER REGION". The Astronomical Journal 138 (6): 1957–1968. doi:10.1088/0004-6256/138/6/1957. Bibcode2009AJ....138.1957T. 
  3. "parsecs to lightyears conversion". http://www.unitconversion.org/length/parsecs-to-light-years-conversion.html. 
  4. "Your NED Search Results". http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+4492&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES. 
  5. Rojas, Sebastián García. "Galaxy NGC 4492 - Spiral Galaxy in Virgo Constellation · Deep Sky Objects Browser" (in en). https://dso-browser.com/deep-sky/5540/ngc-4492/galaxy. 
  6. "New General Catalog Objects: NGC 4450 - 4499" (in en-US). http://cseligman.com/text/atlas/ngc44a.htm#4492. 
  7. 7.0 7.1 7.2 7.3 Sanchis, T.; Mamon, G. A.; Salvador-Solé, E.; Solanes, J. M. (2004-05-01). "The origin of H I-deficiency in galaxies on the outskirts of the Virgo cluster" (in en). Astronomy & Astrophysics 418 (2): 393–411. doi:10.1051/0004-6361:20034158. ISSN 0004-6361. Bibcode2004A&A...418..393S. 
  8. 8.0 8.1 Binggeli, B.; Sandage, A.; Tammann, G. A. (1985). "Studies of the Virgo Cluster. II – A catalog of 2096 galaxies in the Virgo Cluster area". Astronomical Journal 90: 1681–1759. doi:10.1086/113874. Bibcode1985AJ.....90.1681B. 

External links