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NGC 1097 (also known as Caldwell 67) is a barred spiral galaxy about 45 million light years away in the constellation Fornax. It was discovered by William Herschel on 9 October 1790. It is a severely interacting galaxy with obvious tidal debris and distortions caused by interaction with the companion galaxy NGC 1097A.[3] Three supernovae (SN 1992bd, SN 1999eu, and SN 2003B) have been observed in NGC 1097 since 1992.[4]

NGC 1097
NGC 1097 as taken from VLT
Observation data (J2000 epoch)
ConstellationFornax
Right ascension02h 46m 19.0s[1]
Declination−30° 16′ 30″[1]
Redshift1271 ± 3 km/s[1]
Distance45 million ly[2]
Apparent magnitude (V)10.2[1]
Characteristics
Type(R'_1:)SB(r'l)bSy1[1]
Apparent size (V)9′.3 × 6′.3[1]
Other designations
ESO 416- G 20, PGC 10488, UGCA 041[1] Arp 77[1] Caldwell 67

General information


NGC 1097 is also a Seyfert galaxy. Deep photographs revealed four narrow optical jets that appear to emanate from the nucleus. These have been interpreted as manifestations of the (currently weak) active nucleus. Subsequent analysis of the brightest jet's radio-to-X-ray spectral energy distribution were able to rule out synchrotron and thermal free-free emission. The optical jets are in fact composed of stars. The failure to detect atomic hydrogen gas in the jets (under the assumption that they were an example of tidal tails) using deep 21 cm HI imaging with the Very Large Array radio telescope and numerical simulations led to the current interpretation that the jets are actually the shattered remains of a cannibalized dwarf galaxy.

MUSE image shows dust, gas and debris from the galaxy, which are being funneled into the supermassive black hole at its centre.
MUSE image shows dust, gas and debris from the galaxy, which are being funneled into the supermassive black hole at its centre.

NGC 1097 has a supermassive black hole at its center, which is 140 million times the mass of the Sun.[5][6] Around the central black hole is a glowing ring of star-forming regions with a network of gas and dust that spirals from the ring to the black hole. An inflow of material toward the central bar of the galaxy causes new stars to be created in the ring. The ring is approximately 5,000 light-years in diameter, the spiral arms of the galaxy extend tens of thousands of light-years beyond the ring.[5]

NGC 1097 has two satellite galaxies, NGC 1097A and NGC 1097B. Dwarf elliptical galaxy NGC 1097A is the larger of the two. It is a peculiar elliptical galaxy that orbits 42,000 light-years from the center of NGC 1097. Dwarf galaxy NGC 1097B (5 x 106 solar masses), the outermost one, was discovered by its HI emission, and appears to be a typical dwarf irregular. Little else is known about it.


See also



References


  1. "NASA/IPAC Extragalactic Database". Results for NGC 1097. Retrieved 25 November 2006.
  2. "Feeding the Monster: New VLT Images Reveal the Surroundings of a Super-massive Black Hole". European Southern Observatory. Archived from the original on 15 August 2009. Retrieved 15 March 2008.
  3. Buta, Ronald J; Corwin, Harold G; Odewahn, Stephen C (2007). The de Vaucouleurs Atlas of Galaxies. Cambridge University Press. p. 193. ISBN 978-0-521-82048-6.
  4. Harrington, Philip S. (2010). Cosmic Challenge: The Ultimate Observing List for Amateurs. Cambridge, United Kingdom: Cambridge University Press. p. 351. ISBN 978-1-139-49368-0.
  5. "Astronomers Measure Mass of Supermassive Black Hole in NGC 1097 | Astronomy | Sci-News.com". www.sci-news.com. Retrieved 20 June 2015.
  6. Onishi, K.; Iguchi, S.; Sheth, K.; Kohno, K. (10 June 2015). "A Measurement of the Black Hole Mass in NGC 1097 Using ALMA". The Astrophysical Journal. 806 (1): 39. arXiv:1506.05917. Bibcode:2015ApJ...806...39O. doi:10.1088/0004-637X/806/1/39. ISSN 0004-637X. S2CID 119235651.



На других языках

[de] NGC 1097

NGC 1097 = Arp 77 ist eine Balken-Spiralgalaxie mit aktivem Galaxienkern vom Hubble-Typ SBb im Sternbild Fornax am Südsternhimmel. Im Zentrum befindet sich ein auffälliger, rund 5500 Lichtjahre großer Ring mit starker Sternbildung. Dieser Bereich ist aktuell Ziel mehrerer Forschungsprojekte unter anderem bei der ESO. Es gibt deutliche Hinweise auf ein Schwarzes Loch mit etwa 100 Millionen[4] Sonnenmassen im Kern der Galaxie (das im Zentrum der Milchstraße vermutete Schwarze Loch ist hingegen nur wenige Millionen Sonnenmassen groß[4]).
- [en] NGC 1097

[ru] NGC 1097

NGC 1097 (другие обозначения — ESO 416-20, IRAS02441-3029, MCG −5-7-24, Arp 77, UGCA 41, AM 0244-302, PGC 10488) — спиральная галактика в созвездии Печь. В центре галактики находится сверхмассивная чёрная дыра. Этот объект входит в число перечисленных в оригинальной редакции «Нового общего каталога», а также включён в атлас пекулярных галактик.


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