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Currently editing NGC 1277
| NGC 1277 | |
|---|---|
 NGC 1277 as seen by Hubble | |
| Observation data (J2000 epoch) | |
| Right ascension | 3h 19m 51.5s |
| Declination | +41° 34′ 25″ |
| Redshift | 0.016898 |
| Apparent magnitude (V) | 14.7 |
| Characteristics | |
| Type | Lenticular galaxy, peculiar galaxy |
| Other designations | |
| PGC 012434, LGG 088 | |
References: [1] | |
NGC 1277 is a lenticular galaxy in the constellation of Perseus. It is a member of the Perseus Cluster of galaxies and is located approximately 73Mpc (Mega parsecs)[2] or 220 million light years from the Milky Way. It has an apparent magnitude of 14.7. It was discovered on December 4, 1875 by Lawrence Parsons, 4th Earl of Rosse.
NGC 1277 has been called a "relic of the early universe" due to its stars being formed during a 100 million year interval about 12 billion years ago. Stars were formed at a rate of 1000 times that of the Milky Way galaxy's formation rate in a short burst of time. Then this generation process shut off leaving NGC 1277 populated with metal-rich stars about 7 billion years older than our Sun.[2] It is still uncertain whether or not NGC 1277 is a "relic galaxy" current studies are still researching the possibility.[3] [4]
Supermassive black hole
editInitial studies of NGC 1277 detected the possible presence of a supermassive black hole at the center of this galaxy.[5][6]
Observations made using the Hobby-Eberly Telescope at Texas's McDonald Observatory, suggested the presence of a black hole with a mass of about 1.7×1010 M☉ (17 billion solar masses) , equivalent to 14% of the total stellar mass of the galaxy due to the motions of the stars near the center of the galaxy.[5] This makes the black hole in NGC 1277 one of the largest known, in relation to the mass of its host galaxy.
A follow up study,[6] based on the same data and published the following year, reached a very different conclusion. The black hole that was initially suggested at 1.7×1010 M☉ was not particularly over massive. The black hole was estimated to be between 2 and 5 billion solar masses. This is about less than a third of the previously estimated mass which is significantly lower. Models with no black hole at all were found to provide reasonably good fits to the data, including the central region. Nevertheless, it still remains as one of the most massive black holes ever discovered, at 29.6 billion kilometers in diameter - almost five times the distance from the Sun to Pluto.
Recent studies have been conducted using adaptive optics to acquire a better estimate of the mass of the black hole.[3][4]
A group made observations used Gemini Near infrared Integral Field Spectrometer to better determine the mass of the black hole at the center of NGC 1277[3]. The group used similar models to that of van den Bosch but with higher resolution. After using stellar dynamics and luminosity models to estimate the mass of the black hole they came to a mass of 4.9×109 M☉ similar to the follow up study done by Emsellem[6] which estimated a mass between 2-5 solar masses. With this mass NGC 1277 still contains one of the most massive black holes but whether it is still considered a supermassive black hole is still to be determined.[3]
More recently a group made observations using the Keck I Telescope and a black hole with mass 1.2×109 M☉ fit the models the best.[4] This value agrees with the studies done by Walsh[3] and Emsellem[6] though it is still four times smaller than reported and is one order of magnitude smaller than first reported by van den Bosch.[5]
- ^ "NASA/IPAC Extragalactic Database". Results for NGC 1277. Retrieved November 29, 2012.
- ^ a b Trujillo, Ignacio; Ferré-Mateu, Anna; Balcells, Marc; Vazdekis, Alexandre; Sánchez-Blázquez, Patricia (1 January 2014). "NGC 1277: A Massive Compact Relic Galaxy in the Nearby Universe". The Astrophysical Journal Letters. 780: L20. doi:10.1088/2041-8205/780/2/L20. ISSN 0004-637X.
- ^ a b c d e Walsh, Jonelle L.; van den Bosch, Remco C. E.; Gebhardt, Karl; Yildirim, Akin; Richstone, Douglas O.; Gültekin, Kayhan; Husemann, Bernd (1 January 2016). "A 5 x 109 Msun Black Hole in NGC 1277 from Adaptive Optics Spectroscopy". The Astrophysical Journal. 817: 2. doi:10.3847/0004-637X/817/1/2. ISSN 0004-637X.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ a b c Graham, Alister W.; Durré, Mark; Savorgnan, Giulia A. D.; Medling, Anne M.; Batcheldor, Dan; Scott, Nicholas; Watson, Beverly; Marconi, Alessandro (1 March 2016). "A Normal Supermassive Black Hole in NGC 1277". The Astrophysical Journal. 819: 43. doi:10.3847/0004-637X/819/1/43. ISSN 0004-637X.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ a b c van den Bosch, Remco C. E.; et al. (29 Nov 2012). "An over-massive black hole in the compact lenticular galaxy NGC 1277". Nature. 491 (7426): 729–731. arXiv:1211.6429. Bibcode:2012Natur.491..729V. doi:10.1038/nature11592. Retrieved 29 Nov 2012.
- ^ a b c d Emsellem, Eric (Aug 2013). "Is the black hole in NGC 1277 really overmassive?". Monthly Notices of the Royal Astronomical Society. 433 (3): 1862–1870. arXiv:1305.3630. Bibcode:2013MNRAS.433.1862E. doi:10.1093/mnras/stt840.
{{cite journal}}: CS1 maint: unflagged free DOI (link)