NGC 4395

NGC 4395

An ultraviolet image of NGC 4395 taken with GALEX.
Credit: GALEX/NASA
Observation data (J2000 epoch)
Right ascension 12h 25m 48.9s[1]
Declination +33° 32 48[1]
Redshift 319 ± 1 km/s[1]
Type SA(s)m[1]
Apparent dimensions (V) 13.2 × 11.0[1]
Apparent magnitude (V) 10.6[1]
Other designations
NGC 4399 through 4401,[2] UGC 7542,[1] PGC 40596[1]
NGC 4395 by HST

NGC 4395 is a low surface brightness spiral galaxy with a halo that is about 8 in diameter. It has several wide areas of greater brightness running northwest to southeast. The one furthest southeast is the brightest. Three of the patches have their own NGC numbers: 4401, 4400, and 4399 running east to west.[2]

NGC 4395 in 32 inch telescope

The nucleus of NGC 4395 is active and the galaxy is classified as a Seyfert. It is notable for containing one of the smallest supermassive black hole with an accurately-determined mass.[3] The central black hole has a mass of "only" 300,000 Sun masses,[4] which would make it a so-called "intermediate-mass black hole".

References

  1. 1 2 3 4 5 6 7 8 "NASA/IPAC Extragalactic Database". Results for. Retrieved 2006-11-04.
  2. 1 2 Kepple, George Robert; Glen W. Sanner (1998). The Night Sky Observer's Guide, Volume 2. Willmann-Bell, Inc. p. 48. ISBN 0-943396-60-3.
  3. Merritt, David (2013). Dynamics and Evolution of Galactic Nuclei. Princeton, NJ: Princeton University Press. ISBN 9781400846122.
  4. Peterson, Bradley; et al. (2005). "Multiwavelength Monitoring of the Dwarf Seyfert 1 Galaxy NGC 4395. I. A Reverberation-based Measurement of the Black Hole Mass". The Astrophysical Journal 632: 799–808. arXiv:astro-ph/0506665. Bibcode:2005ApJ...632..799P. doi:10.1086/444494.


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