| NGC 7004 | |
|---|---|
 NGC 7004 (bottom) and NGC 7002 (top) with legacy survey | |
| Observation data (J2000 epoch) | |
| Constellation | Indus |
| Right ascension | 21h 04m 02.2s[1] |
| Declination | −49° 06′ 51″[1] |
| Redshift | 0.025284 |
| Heliocentric radial velocity | 7580 km/s[1] |
| Distance | 330 Mly (101 Mpc)[1] |
| Apparent magnitude (V) | 13.8[1] |
| Absolute magnitude (B) | -21.87 ± 0.09 [1] |
| Characteristics | |
| Type | (R')SAB0/a?(s)[1] |
| Size | ~139,500 ly (42.78 kpc) (estimated) |
| Apparent size (V) | 1.31× 0.44[1] |
| Other designations | |
| ESO 235-46, FAIR 938, PGC 66019[1] | |
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NGC 7004 is a lenticular galaxy[1] and a type 2 Seyfert galaxy[2] around 330 million light-years away from Earth in the constellation Indus.[3][1] NGC 7004 has an estimated diameter of 140,000 light-years.[1] NGC 7004 was discovered by astronomer John Herschel on October 2, 1834.[4] NGC 7004 is a member of a group of galaxies[5] known as [T2015] nest 200093.[6] The group contains 12 member galaxies including NGC 7002, has a velocity dispersion of 440 km/s and an estimated mass of 1.28 × 1014 M☉.[5] NGC 7004 is also host to a supermassive black hole with an estimated mass of 8.1 × 108 M☉.[7]
- ^ a b c d e f g h i j k l "NED results for object NGC 7004". ned.ipac.caltech.edu. Retrieved 2017-04-23.
- ^ "NGC 7004". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-22.
- ^ Rojas, Sebastián García. "Galaxy NGC 7004 Deep Sky Objects Browser". DSO Browser. Archived from the original on 2017-05-24. Retrieved 2017-04-23.
- ^ "New General Catalog Objects: NGC 7000 - 7049". cseligman.com. Retrieved 2017-04-15.
- ^ a b Tully, R. Brent (2015-05-01). "Galaxy Groups: A 2MASS Catalog". The Astronomical Journal. 149 (5): 171. arXiv:1503.03134. Bibcode:2015AJ....149..171T. doi:10.1088/0004-6256/149/5/171. ISSN 0004-6256.
- ^ "[T2015] nest 200093". simbad.cds.unistra.fr. Retrieved 2024-08-16.
- ^ Arzoumanian, Zaven; Baker, Paul T.; Brazier, Adam; Brook, Paul R.; Burke-Spolaor, Sarah; Becsy, Bence; Charisi, Maria; Chatterjee, Shami; Cordes, James M.; Cornish, Neil J.; Crawford, Fronefield; Cromartie, H. Thankful; Decesar, Megan E.; Demorest, Paul B.; Dolch, Timothy (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. arXiv:2101.02716. Bibcode:2021ApJ...914..121A. doi:10.3847/1538-4357/abfcd3. ISSN 0004-637X.