NGC 877 explained

NGC 877
Epoch:J2000
Type:SAB(rs)bc [1]
Dist Ly:154 ± 25 Mly (47.1 ± 7.5 Mpc)
Z:0.013052 ± 0.000010
H Radial V:3,913 ± 3 km/s
Appmag V:11.8 [2]
Size V:2.4 × 1.8
Constellation Name:Aries
Notes:Luminous infrared galaxy
Names:UGC 1768, CGCG 438-052, MCG +02-06-058, PGC 8775

NGC 877 is an intermediate spiral galaxy located in the constellation Aries. It is located at a distance of circa 160 million light years from Earth, which, given its apparent dimensions, means that NGC 877 is about 115,000 light years across. It was discovered by William Herschel on October 14, 1784.[3] It interacts with NGC 876.

NGC 877 features two spiral arms with a grand design pattern and slightly disturbed morphology. When pictured in H-alpha, the arms have numerous knots and appear brighter than the nucleus. The northwest part of the galaxy has higher polarised emission than the rest of the galaxy. A bar appears in radio waves.[4] The nucleus has activity that resembles that of a HII region.[5] The galaxy has been categorised as a luminous infrared galaxy, a category of galaxies associated with high star formation rate. The total infrared luminosity of the galaxy is estimated to be between [6] and, lying near the threshold to classify a galaxy as luminous infrared. The total star formation rate in NGC 877 is estimated to be between 20 and 53 per year.[7]

One possible supernova has been observed in NGC 877, SN 2019rn. It was discovered by the robotic sky survey ATLAS on January 12.30, 2019, using a twin 0.5m telescope system. It had apparent magnitude 18.9 on discovery.[8] The supernova was initially classified as a type II supernova with spectroscopic observations by Keck-II,[9] and further spectrographic observations categorised it as type IIb, although it could also be a cataclysmic variable or another type of variable star.[10]

NGC 877 forms a pair with the edge-on spiral galaxy NGC 876, which lies 2.1 arcminutes to the southwest. At the distance of NGC 877, this corresponds to a projected distance of 30 kpc. A low surface brightness bridge connects the two galaxies.[4] NGC 870 and NGC 871 are two other nearby galaxies.[11] NGC 877 is the brightest and most massive member of a galaxy group known as the NGC 877 group or LGG (Lyon Groups of Galaxies) 53. Other members of the group include NGC 876 and NGC 871, as well as UGC 1693, IC 1791, UGC 1773, and UGC 1817.[12] The group contains large amounts of HI gas.[13]

External links

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 877 . 2016-01-18 .
  2. Web site: Revised NGC Data for NGC 877 . spider.seds.org . 25 November 2018.
  3. Web site: Seligman . Courtney . NGC 877 (= PGC 8775) . Celestial Atlas . 19 November 2018.
  4. Drzazga . R. T. . Chyży . K. T. . Jurusik . W. . Wiórkiewicz . K. . Magnetic field evolution in interacting galaxies . Astronomy & Astrophysics . 19 August 2011 . 533 . A22 . 10.1051/0004-6361/201016092. 2011A&A...533A..22D . 1107.3280 . 53558637 .
  5. Ho . Luis C. . Filippenko . Alexei V. . Sargent . Wallace L. W. . A Search for "Dwarf Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies . The Astrophysical Journal Supplement Series . October 1997 . 112 . 2 . 315–390 . 10.1086/313041. 1997ApJS..112..315H . astro-ph/9704107 . 17086638 .
  6. Sanders . D. B. . Mazzarella . J. M. . Kim . D.-C. . Surace . J. A. . Soifer . B. T. . The IRAS Revised Bright Galaxy Sample . The Astronomical Journal . October 2003 . 126 . 4 . 1607–1664 . 10.1086/376841. 2003AJ....126.1607S . astro-ph/0306263 . 14825701 .
  7. Pereira-Santaella . Miguel . Alonso-Herrero . Almudena. Almudena Alonso-Herrero . Colina . Luis . Miralles-Caballero . Daniel . Pérez-González . Pablo G. . Arribas . Santiago . Bellocchi . Enrica . Cazzoli . Sara . Díaz-Santos . Tanio . López . Javier Piqueras . Star-formation histories of local luminous infrared galaxies . Astronomy & Astrophysics . 6 May 2015 . 577 . A78 . 10.1051/0004-6361/201425359. 2015A&A...577A..78P . 1502.07965 . 2997010 .
  8. Web site: ATel #12384: ATLAS19bdu (AT2019rn): discovery of a candidate SN in NGC 0877 (47 Mpc) . ATel . 13 January 2019.
  9. Web site: ATel #12388: Spectroscopic classification of SN2019rn as a Type II supernova with Keck-II . ATel . 14 January 2019.
  10. Web site: ATel #12391: SCAT classification of optical transients . ATel . 15 January 2019.
  11. Hattori . T. . Yoshida . M. . Ohtani . H. . Sugai . H. . Ishigaki . T. . Sasaki . M. . Hayashi . T. . Ozaki . S. . Ishii . M. . Kawai . A. . A Study of the Distribution of Star-forming Regions in Luminous Infrared Galaxies by Means of H Imaging Observations . The Astronomical Journal . February 2004 . 127 . 2 . 736–757 . 10.1086/381060. 2004AJ....127..736H . astro-ph/0311179 . 18181421 .
  12. Garcia, A. M. . General study of group membership. II - Determination of nearby groups . Astronomy and Astrophysics Supplement Series . 1993 . 100 . 1 . 47–90 . 0365-0138 . 1993A&AS..100...47G.
  13. Lee-Waddell . Kristine Spekkens . K. . Spekkens . K. . Cuillandre . J.-C. . Cannon . J. . Haynes . M. P. . Sick . J. . Chandra . P. . Patra . N. . Stierwalt . S. . Giovanelli . R. . An extremely optically dim tidal feature in the gas-rich interacting galaxy group NGC 871/NGC 876/NGC 877 . Monthly Notices of the Royal Astronomical Society . 1 October 2014 . 443 . 4 . 3601–3611 . 10.1093/mnras/stu1345. free . 2014MNRAS.443.3601L . 1407.1732 . 119199197 .

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