Astronomy:NGC 3954

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NGC 3954
NGC 3954
SDSS image of NGC 3954
Observation data (J2000 epoch)
ConstellationLeo
Right ascension 11h 53m 41.66824s[1]
Declination+20° 52′ 56.9871″[1]
Redshift0.023196[2]
Helio radial velocity6954 km/s[2]
Distance324 Mly (99.2 Mpc)[2]
Group or clusterNGC 3937 Group
Apparent magnitude (V)14.65[2]
Absolute magnitude (B)-22.84[2]
Characteristics
TypeE?[2]
Size~141,600 ly (43.41 kpc) (estimated)[2]
Apparent size (V)0.6′ × 0.6′[2]
Other designations
UGC 6866, MCG+04-28-091, PGC 37291[2]

NGC 3954 is an elliptical galaxy located 324 million light-years away[3] in the Leo constellation. It was discovered on April 26, 1785, by the astronomer William Herschel.[4] NGC 3954 is a LINER galaxy,[5] and is a member of the NGC 3937 Group.[6][7]

NGC 3954 has a supermassive black hole with an estimated mass of 4.8 × 108 M☉.[8]

NGC 3842 Group

File:Groupe de NGC 3842.jpg
Image of NGC 3842 Group

NGC 3947 is part of the NGC 3842 group, the brightest galaxy in this group. The NGC 3842 group contains at least 16 galaxies. The other galaxies in the group are NGC 3805, NGC 3837, NGC 3842, NGC 3860, NGC 3862, NGC 3883, NGC 3884, NGC 3919, NGC 3929, NGC 3937, NGC 3940, NGC 3947, UGC 6697 and UGC 6725, respectively designated 1141+2015 and 1142+2044 for the galaxies CGCG 1141.2+2015 and CGCG 1142.5+2044. The 16th galaxy in the list published by Abraham Mahtessian in 1998 is designated 1134+2015, an unfortunate abbreviated notation that makes galaxy identification difficult and sometimes even impossible, as this one is not included in the NASA/IPAC and Simbad databases. It is possible that 1134+2015 is the galaxy SDSS J114348.22+195830.7, which is north of and very close to UGC 6697. The Hubble distance to this dwarf galaxy is indeed 105.0 ± 7.4 Mpc (∼342 million light-years ), and it therefore likely belongs to the NGC 3862 group.[9]

File:UGC 6697 (15014754963).png
Dwarf galaxy 2MASX J11434983+1958343 north of UGC 6697 is probably part of the NGC 3842 group

The galaxy north of NGC 3862 is IC 2955. The Hubble distances to these two galaxies are 100.3 ± 7.0 Mpc (∼327 million light-years) and 100.8 ± 7.1 Mpc (∼329 million light-years) respectively. These two galaxies probably form a pair. IC 2955 is therefore part of the NGC 3842 group.[10]

Leo cluster

Like several of the neighboring galaxies, NGC 3947 and the galaxies of the NGC 3842 group are part of the Leo Cluster.[11]

See also

References

  1. ↑ 1.0 1.1 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 "Results for object NGC 3954". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+3954. 
  3. ↑ "Your NED Search Results". https://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC%203954&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA%20or%20Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES. 
  4. ↑ Seligman, Courtney. "New General Catalog Objects: NGC 3950 - 3999". https://cseligman.com/text/atlas/ngc39a.htm#3954. 
  5. ↑ "NGC 3954". https://simbad.cds.unistra.fr/simbad/sim-id. 
  6. ↑ Gregory, S. A.; Thompson, L. A. (1978-06-15). "The Coma/A1367 supercluster and its environs" (in en). The Astrophysical Journal 222: 784. doi:10.1086/156198. ISSN 0004-637X. Bibcode: 1978ApJ...222..784G. http://adsabs.harvard.edu/doi/10.1086/156198. 
  7. ↑ Tully, R. Brent (2015-04-28). "Galaxy Groups: A 2Mass Catalog". The Astronomical Journal 149 (5): 171. doi:10.1088/0004-6256/149/5/171. ISSN 1538-3881. Bibcode: 2015AJ....149..171T. https://iopscience.iop.org/article/10.1088/0004-6256/149/5/171. 
  8. ↑ Arzoumanian, Zaven; Baker, Paul T.; Brazier, Adam; Brook, Paul R.; Burke-Spolaor, Sarah; Becsy, Bence; Charisi, Maria; Chatterjee, Shami et al. (2021-06-01). "The NANOGrav 11 yr Data Set: Limits on Supermassive Black Hole Binaries in Galaxies within 500 Mpc". The Astrophysical Journal 914 (2): 121. doi:10.3847/1538-4357/abfcd3. ISSN 0004-637X. Bibcode: 2021ApJ...914..121A. 
  9. ↑ Mahtessian, A. P. (July 1998). "Groups of galaxies. III. Some empirical characteristics" (in en). Astrophysics 41 (3): 308–321. doi:10.1007/BF03036100. ISSN 0571-7256. http://link.springer.com/10.1007/BF03036100. 
  10. ↑ "New General Catalog Objects: NGC 3950 - 3999". https://cseligman.com/text/atlas/ngc39a.htm#3954. 
  11. ↑ "New General Catalog Objects: NGC 3800 - 3849". https://cseligman.com/text/atlas/ngc38.htm#3837. 

Coordinates: Sky map 11h 13m 41.66824s, +20° 52′ 56.9871″



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