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NGC 2617
legacy surveys image of NGC 2617 (right) and MCG-01-22-027
Observation data (J2000 epoch)
Constellation	Hydra
Right ascension	08 35 38.798
Declination	−04° 05′ 17.90″
Heliocentric radial velocity	4,287 km/s
Distance	201.8 Mly (61.86 Mpc)h 0.73
Apparent magnitude (V)	12.66±0.20
Apparent magnitude (B)	14.10±0.30
Characteristics
Type	Sc
Apparent size (V)	0.693′ × 0.652′ (infrared)
Other designations
IRAS F08331-0354, 2MASX J08353877-0405172, NGC 2617, MCG −01–22–026

NGC 2617 is a Seyfert galaxy in the equatorial constellation of Hydra. It was discovered on February 12, 1885, by French astronomer Édouard Stephan. In 1888, Danish astronomer J. L. E. Dreyer described it as "extremely faint, very small, 2 very faint stars involved". It is located at an estimated distance of 202 million light years. In the infrared, the galaxy has an angular size of 0.693 by 0.652 arcminutes.

This is an almost face-on spiral galaxy with a morphological classification of Sc, indicating a spiral galaxy (S) with loosely wound spiral arms (c). In 1992, NGC 2617 was shown to be an extragalactic source of X-ray emission, and in 1996 it was identified as a Seyfert 1.8 galaxy by E. C. Moran and associates. A radio counterpart was found in 1998.

During April 2013, a dramatic outburst was discovered at the core of NGC 2617, and the spectral type was found to have changed to a Seyfert 1. An increase in X-ray emission was observed, followed by an increase in ultraviolet and then infrared luminosity. This event can be modeled by X-ray radiation heating the accretion disk orbiting a supermassive black hole (SMBH) at the center of the galaxy. This was followed by emission at longer wavelengths from the heated disk. An increase in luminosity between 2010 and 2012 may have cleared away dust in the inner part of the disk prior to the outburst, allowing a clearer view and changing the Seyfert type of the galaxy. The SMBH has an estimated mass of 30.9+11.8
−8.5 million M_☉.

Additional outbursts were observed from 2016 to 2018, in between deep minima.

References

1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
2. ^ Crook, Aidan C.; et al. (February 2007), "Groups of Galaxies in the Two Micron All Sky Redshift Survey", The Astrophysical Journal, 655 (2): 790–813, arXiv:astro-ph/0610732, Bibcode:2007ApJ...655..790C, doi:10.1086/510201, S2CID 11672751.
3. ^ Robinson, Justin H.; et al. (May 2021), "Tully-Fisher Distances and Dynamical Mass Constraints for 24 Host Galaxies of Reverberation-mapped AGNs", The Astrophysical Journal, 912 (2): 160, arXiv:2103.07000, Bibcode:2021ApJ...912..160R, doi:10.3847/1538-4357/abedaa, S2CID 232223280, 160.
4. ^ Shappee, B. J.; et al. (June 2014), "The Man behind the Curtain: X-Rays Drive the UV through NIR Variability in the 2013 Active Galactic Nucleus Outburst in NGC 2617", The Astrophysical Journal, 788 (1): 48, arXiv:1310.2241, Bibcode:2014ApJ...788...48S, doi:10.1088/0004-637X/788/1/48, S2CID 119113433.{{citation}}: CS1 maint: multiple names: authors list (link)
5. ^ Skrutskie, Michael F.; et al. (February 1, 2006), "The Two Micron All Sky Survey (2MASS)", The Astronomical Journal, 131 (2): 1163–1183, Bibcode:2006AJ....131.1163S, doi:10.1086/498708, ISSN 0004-6256, S2CID 18913331.
6. "NGC 2617", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2023-02-24.
7. Erdmann, Robert E. Jr. (December 2006), "NGC Discoverer's List", The NGC/IC Project, retrieved 2023-02-26.
8. Seligman, Courtney (Aug 25, 2021), "NGC Objects: NGC 2600 - 2649", Celestial Atlas, retrieved 2023-02-26.
9. Sulentic, Jack W.; et al. (1973), The Revised New Catalogue of Nonstellar Astronomical Objects, Tucson: University of Arizona Press, Bibcode:1973rncn.book.....S.
10. Boller, Th.; et al. (July 1992), "ROSAT all sky survey observations of IRAS galaxies.", Astronomy and Astrophysics, 261: 57–77, Bibcode:1992A&A...261...57B.
11. Moran, Edward C.; et al. (October 1996), "Classification of IRAS-selected X-Ray Galaxies in the ROSAT All-Sky Survey", Astrophysical Journal Supplement, 106: 341, Bibcode:1996ApJS..106..341M, doi:10.1086/192341.
12. Condon, J. J.; et al. (May 1998), "The NRAO VLA Sky Survey", The Astronomical Journal, 115 (5): 1693–1716, Bibcode:1998AJ....115.1693C, doi:10.1086/300337, S2CID 120464396.
13. Shappee, B. J.; et al. (April 2013), "ASAS-SN Discovery of a Strong AGN Outburst and Dramatic Seyfert Type Change in NGC 2617", The Astronomer's Telegram, 5010: 1, Bibcode:2013ATel.5010....1S.
14. Oknyansky, V. L.; et al. (May 2017), "The curtain remains open: NGC 2617 continues in a high state", Monthly Notices of the Royal Astronomical Society, 467 (2): 1496–1504, arXiv:1701.05042, Bibcode:2017MNRAS.467.1496O, doi:10.1093/mnras/stx149.
15. Oknyansky, V.; et al. (June 2018), "NGC 2617 brightens again after long very low state", The Astronomer's Telegram, 11703: 1, Bibcode:2018ATel11703....1O.

Further reading

• Hoin, S.; et al. (December 2022), "Six Swift Observations of the CLAGN NGC 2617", The Astronomer's Telegram, 15804: 1, Bibcode:2022ATel15804....1H.
• Yang, Jun; et al. (May 2021), "A compact core-jet structure in the changing-look Seyfert NGC 2617", Monthly Notices of the Royal Astronomical Society, 503 (3): 3886–3895, arXiv:2103.04309, Bibcode:2021MNRAS.503.3886Y, doi:10.1093/mnras/stab706.
• Feng, Hai-Cheng; et al. (May 2021), "Velocity-resolved Reverberation Mapping of Changing-look AGN NGC 2617", The Astrophysical Journal, 912 (2): 92, arXiv:2103.03508, Bibcode:2021ApJ...912...92F, doi:10.3847/1538-4357/abefe0, S2CID 232134945, 92.
• "Astronomers track changes around supermassive black hole in the NGC 2617 galaxy", phys.org, Lomonosov Moscow State University, February 22, 2017, retrieved 2023-02-26.
• Giustini, M.; et al. (January 2017), "Direct probe of the inner accretion flow around the supermassive black hole in NGC 2617", Astronomy & Astrophysics, 597: A66, arXiv:1608.00233, Bibcode:2017A&A...597A..66G, doi:10.1051/0004-6361/201628686, S2CID 118783919, A66.
• Jencson, J.; et al. (August 2013), "VLBA Observations of AGN Activity in NGC 2617", The Astronomer's Telegram, 5347: 1, Bibcode:2013ATel.5347....1J.
• Yang, J.; et al. (June 2013), "e-EVN detection of AGN activity in NGC 2617", The Astronomer's Telegram, 5125: 1, Bibcode:2013ATel.5125....1Y.

• Seyfert galaxies
• Spiral galaxies
• NGC objects
• Discoveries by Édouard Stephan
• Hydra (constellation)