| NGC 4958 | |
|---|---|
 NGC 4958 imaged by Legacy Surveys | |
| Observation data (J2000epoch) | |
| Constellation | Virgo |
| Right ascension | 13h 05m 48.9027s[1] |
| Declination | −08° 01′ 12.799″[1] |
| Redshift | 0.004853 ± 0.000030[1] |
| Heliocentric radial velocity | 1,455 ± 9 km/s[1] |
| Distance | 39.2 ± 22.4Mly (12.0 ± 6.9Mpc)[1] |
| Group orcluster | NGC 4697 Group |
| Apparent magnitude (V) | 10.7[2] |
| Characteristics | |
| Type | SB(r)0?[1] |
| Size | ~46,000 ly (14.2 kpc) (estimated)[1] |
| Apparent size (V) | 4.1′ × 1.3′[1] |
| Other designations | |
| UGCA 323,MCG -01-33-084,PGC 45313[1] | |
NGC 4958 is abarred lenticular galaxy in the constellationVirgo. The galaxy lies about 40 millionlight years away from Earth based on refshift-independent methods, which means, given its apparent dimensions, that NGC 4958 is approximately 45,000 light years across.[1] Based onredshift the galaxy is about 80 million light years away.[1] It was discovered byWilliam Herschel on March 3, 1786.[3] The galaxy is included in theHerschel 400 Catalogue. Through a small telescope it appears as a small but well concentrated circular glow.[4]
NGC 4958 has an ellipticalbulge embedded in a thick disk.[5] A bright lens, measuring 1.8 by 0.45 arcminutes, with faint ansae surrounds the bulge. There is a possible ring with a diameter of 1.2 arcminutes. The nucleus is very bright.[6] The optical spectrum of the nuclear region revealed the presence of a broad double-peakedH-alpha element, which was attributed to the presence of anaccretion disk around the centralsupermassive black hole. Based on this spectrum the nucleus is considered to beactive and has been characterised as a type 1LINER.[7] The mass of the supermassive black hole is estimated to be 107.47+0.11
−0.03 (28 - 38 millions)M☉.[8]
NGC 4958 is a member of the NGC 4697 Group, also known as LGG 314.[9][10] Other members of the group includeNGC 4697,NGC 4731,NGC 4775,NGC 4941,NGC 4951, andNGC 4948.[10] NGC 4948 lies 14 arcminutes away, while NGC 4948A is 13.5 arcminutes away.[6] It is part of theVirgo II Groups, a chain of groups extending from theVirgo Cluster.[11]
