Astronomy:NGC 4378
| NGC 4378 | |
|---|---|
.jpg) NGC 4378 imaged by the Vera C. Rubin Observatory | |
| Observation data (J2000 epoch) | |
| Constellation | Virgo |
| Right ascension | 12h 25m 18.1071s[1] |
| Declination | +04° 55′ 30.524″[1] |
| Redshift | 0.008536±0.00001[1] |
| Helio radial velocity | 2,559±3 km/s[1] |
| Distance | 136.50 ± 16.23 Mly (41.850 ± 4.975 Mpc)[1] |
| Group or cluster | Virgo Cluster |
| Apparent magnitude (V) | 12.63[1] |
| Characteristics | |
| Type | (R)SA(s)a[1] |
| Size | ~131,000 ly (40.17 kpc) (estimated)[1] |
| Apparent size (V) | 2.9′ × 2.7′[1] |
| Other designations | |
| VCC 785, IRAS F12227+0512, UGC 7497, MCG+01-32-052, PGC 40490[1] | |
NGC 4378 is a spiral galaxy in the constellation of Virgo. Its velocity with respect to the cosmic microwave background is 2,903±24 km/s, which corresponds to a Hubble distance of 139.7 ± 9.8 Mly (42.82 ± 3.02 Mpc).[1] Also, six non-redshift measurements give a similar distance of 136.50 ± 16.23 Mly (41.850 ± 4.975 Mpc).[2] It was discovered by German-British astronomer William Herschel on 2 February 1786.[3][4] It is a member of the Virgo Cluster, listed as VCC 785.
NGC 4378 is a Seyfert II galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.[5]
Supermassive black hole
A study based on near-infrared K-band luminosity measurements of the NGC 4378 bulge gives a value of 1000000 M☉ (108 million solar masses) for the supermassive black hole there.[6]
According to the authors of a paper published in 2012, knowledge of the mass of a central black hole and the rate of accretion by it makes it possible to estimate the rate of star formation in the central region of Seyfert-type galaxies. The rate for NGC 4378 would be between 0.059M☉ / year and 0.56M☉ / year, respectively, within and outside a radius of 1 kpc.[7]
See also
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Results for object NGC 4378". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+4378.
- ↑ "Distance Results for NGC 4378". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+4378.
- ↑ Herschel, W. (1789). "Catalogue of a Second Thousand of New Nebulae and Clusters of Stars; with a Few Introductory Remarks on the Construction of the Heavens". Philosophical Transactions of the Royal Society of London 79: 212–255. doi:10.1098/rstl.1789.0021. Bibcode: 1789RSPT...79..212H.
- ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 4378". https://cseligman.com/text/atlas/ngc43a.htm#4378.
- ↑ "NGC 4378". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+4378.
- ↑ Dong, X. Y.; De Robertis, M. M. (2006). "Low-Luminosity Active Galaxies and Their Central Black Holes". The Astronomical Journal 131 (3): 1236–1252. doi:10.1086/499346. Bibcode: 2006AJ....131.1236D.
- ↑ Diamond-Stanic, Aleksandar M.; Rieke, George H. (2012). "The Relationship between Black Hole Growth and Star Formation in Seyfert Galaxies". The Astrophysical Journal 746 (2): 168. doi:10.1088/0004-637X/746/2/168. Bibcode: 2012ApJ...746..168D.
External links
- NGC 4378 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
12h 25m 18.1071s, +04° 55′ 30.524″
 |  |
