NGC 997
| NGC 997 | |
|---|---|
 NGC 997 and its neighbouring galaxies captured bySDSS | |
| Observation data (J2000epoch) | |
| Constellation | Cetus |
| Right ascension | 02h37m14.50s |
| Declination | ±07° 18′ 28.0″ |
| Redshift | 0.021695 |
| Heliocentric radial velocity | 6504 ± 42km/s |
| Distance | 301.6 ± 21.3Mly(92.48 ± 6.54Mpc) |
| Grouporcluster | [CHM2007] HDC 157, [CHM2007] LDC 181, [T2015] nest 200334 |
| Characteristics | |
| Type | E[1] |
| Size | ~105,800ly(32.44kpc) (estimated) |
| Other designations | |
| IRASF02345+0705,UGC2102,MCG+01-07-016,CGCG414-027 | |
NGC 997is aninteracting galaxyin the constellation ofCetus.The galaxy was discovered byAlbert Marthon 10 November 1863.[3]It has a regularly rotating central molecular gas disk, containing a black hole of between 4 x 107and 1.8 x 109solar masses.[4]Its speed relative to the cosmological background is 6,270 ± 45 km/s, corresponding to a Hubble distance of 92.5 ± 6.5 Mpc (~302 million ly).[2]
NGC 997 is accompanied by PGC 200205, also designated as NGC 997 NED01,[5]acompact galaxy.No data is available for the latter galaxy. So, this pair may be due to an optical alignment, or they may be two gravitationally interacting galaxies about to merge.
Onesupernovahas been observed in NGC 997: SN2020nej (typeIa,mag. 17).[6]
See also
[edit]References
[edit]- ^ab"NGC 997".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2021-08-23.
- ^ab"Results for object NGC 997".NASA/IPAC Extragalactic Database.NASAandCaltech.Retrieved5 September2024.
- ^Seligman, Courtney."New General Catalogue objects: NGC 950 - 999".cseligman.com.Retrieved2021-08-23.
- ^Dominiak, Pandora; Bureau, Martin; Davis, Timothy A; Ma, Chung-Pei; Greene, Jenny E; Gu, Meng (2024-01-31)."The MASSIVE survey - XIX. Molecular gas measurements of the supermassive black hole masses in the elliptical galaxies NGC 1684 and NGC 0997".Monthly Notices of the Royal Astronomical Society.529(2): 1597–1616.arXiv:2401.16376.doi:10.1093/mnras/stae314.ISSN0035-8711.
- ^"Results for object NGC 997 NED01".NASA/IPAC Extragalactic Database.NASAandCaltech.Retrieved5 September2024.
- ^"SN2020nej ".Transient Name Server.IAU.Retrieved5 September2024.
External links
[edit]
Media related toNGC 997at Wikimedia Commons
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