NGC 2770

NGC 2770 is a spiral galaxy in the northern constellation of Lynx,[5] near the northern constellation border with Cancer. It was discovered by German-born astronomer William Herschel on December 7, 1785. J. L. E. Dreyer described it as, "faint, large, much extended 150°, mottled but not resolved, 2 stars to north".[8] NGC 2770 was the target for the first binocular image produced by the Large Binocular Telescope.[9]

NGC 2770
NGC 2770 and companion galaxy
Credit: Gemini Observatory/AURA.
Observation data (J2000 epoch)
ConstellationLynx
Right ascension09h 09m 33.622s[1]
Declination+33° 07′ 24.29″[1]
Redshift1943±1 km/s[2]
Distance77 Mly (24 Mpc)[3]
88 Mly (27 Mpc)[4]
Apparent magnitude (V)12.0[5]
Characteristics
TypeSBc[3]
Apparent size (V)1.967′ × 0.511′[1] (NIR)
Notable featuresFour supernovae[6]
Other designations
LEDA 25806, MCG+06-20-038, NGC 2770, UGC 4806[7]

The morphological classification of SBc[3] indicates a barred spiral with moderately-wound arms. The physical properties of this galaxy are similar to those of the Milky Way. The combined mass of stars in the galaxy is estimated at 2.1×1010 M☉, and it has a star formation rate of ~1.1 M☉ y−1. There are no apparent perturbations of the galaxy due to suspected interaction with the companion galaxy, NGC 2770B.[10]

The Type Ib supernova Supernova 2008D in galaxy NGC 2770, shown in X-ray (left) and visible light (right)

As of 2017, up to four supernovae events have been discovered in this galaxy.[6] Three were of Type Ib: SN 1999eh, SN 2007uy, and SN 2008D.[10] The last of these was the first supernova detected by the X-rays released very early on in its formation, rather than by the optical light emitted during the later stages, which allowed the first moments of the outburst to be observed. It is possible that NGC 2770's interactions with a suspected companion galaxy may have created the massive stars causing this activity.[11] SN 2015bh, discovered in NGC 2770 in February 2015,[12] was either a Type II supernova or the hyper-eruption of a luminous blue variable.[6]

References
  1. Skrutskie, Michael F.; et al. (1 February 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.
  2. van Driel, W.; et al. (November 2016). "NIBLES: an H I census of stellar mass selected SDSS galaxies. I. The Nançay H I survey". Astronomy & Astrophysics. 595: 43. arXiv:1607.02787. Bibcode:2016A&A...595A.118V. doi:10.1051/0004-6361/201528048. S2CID 118623916. A118.
  3. Ann, H. B.; et al. (2015). "A Catalog of Visually Classified Galaxies in the Local (z ~ 0.01) Universe". The Astrophysical Journal Supplement Series. 217 (2): 27–49. arXiv:1502.03545. Bibcode:2015ApJS..217...27A. doi:10.1088/0067-0049/217/2/27. S2CID 119253507.
  4. Soderberg, Alicia; et al. (May 22, 2008). "An extremely luminous X-ray outburst at the birth of a supernova". Nature. 453 (7194): 469–474. arXiv:0802.1712. Bibcode:2008Natur.453..469S. doi:10.1038/nature06997. PMID 18497815. S2CID 453215.
  5. "NASA/IPAC Extragalactic Database". Results for NGC 2770. Retrieved 2008-05-26.
  6. Thöne, C. C.; et al. (March 2017). "SN 2015bh: NGC 2770's 4th supernova or a luminous blue variable on its way to a Wolf-Rayet star?". Astronomy & Astrophysics. 599: 29. arXiv:1606.09025. Bibcode:2017A&A...599A.129T. doi:10.1051/0004-6361/201629968. S2CID 56266352. A129.
  7. "NGC 2770". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-09-07.
  8. Seligman, Courtney. "NGC Objects: NGC 2600 - 2649". Celestial Atlas. Retrieved 2020-09-07.
  9. "LBT Press Release - First Binocular Light". Archived from the original on 2011-07-25. Retrieved 2008-05-22.
  10. Thöne, Christina C.; et al. (June 2009). "NGC 2770: A Supernova Ib Factory?". The Astrophysical Journal. 698 (2): 1307–1320. arXiv:0807.0473. Bibcode:2009ApJ...698.1307T. doi:10.1088/0004-637X/698/2/1307. S2CID 118697339.
  11. "Catching the Light of a Baby Supernova". Gemini Observatory. Archived from the original on 23 August 2015. Retrieved 7 July 2015.
  12. "List of Supernovae". IAU Central Bureau for Astronomical Telegrams. IAU. Retrieved 19 February 2017.

Further reading
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