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NGC 772

NGC 772
NGC 772 imaged by the Gemini Observatory[1]
Observation data (J2000 epoch)
ConstellationAries
Right ascension01h 59m 19.6s[2]
Declination+19° 00′ 27.1″[2]
Redshift2472 ± 3 km/s[2]
Distance105.7 ± 7.5 Mly (32.42 ± 2.29 Mpc)[2]
Apparent magnitude (V)11.1[2]
Characteristics
TypeSA(s)b[2]
Apparent size (V)7.2′ × 4.3′[2]
Other designations
UGC 1466,[2] PGC 7525,[2] Arp 78[2]

NGC 772 (also known as Arp 78 or the Fiddlehead Galaxy[3]) is an unbarred spiral galaxy approximately 106 million light-years away in the constellation Aries. It was discovered on 29 November 1785 by German-British astronomer William Herschel.[4]

Characteristics

At around 200,000 light years in diameter, NGC 772 is somewhat larger than the Milky Way Galaxy,[5] and is surrounded by several satellite galaxies – including the dwarf elliptical, NGC 770 – whose tidal forces on the larger galaxy have likely caused the emergence of a single elongated outer spiral arm that is much more developed and stronger than the others arms. Halton Arp includes NGC 772 in his Atlas of Peculiar Galaxies as Arp 78, where it is described as a "Spiral galaxy with a small high-surface brightness companion".

Three supernovae have been observed in NGC 772. SN 2003hl (Type II, mag. 16.5)[6] was discovered on 20 August 2003. SN 2003iq (Type II, mag. 16.4)[7] was discovered on 8 October 2003.[8] SN 2022qze (type IIP, mag. 19.9) was discovered on 8 August 2022.[9]

NGC 772 probably has a H II nucleus, but it may be a transitional object.[10]

  • RGB image of the galaxy NGC 772 and dwarf galaxy NGC 770 (top center) interacting, from the Liverpool Telescope
    RGB image of the galaxy NGC 772 and dwarf galaxy NGC 770 (top center) interacting, from the Liverpool Telescope
  • Center of the galaxy imaged by the Hubble Space Telescope.[11]
    Center of the galaxy imaged by the Hubble Space Telescope.[11]
  • Two supernovae in the galaxy (SN 2003hl & 2003iq) and asteroid 6223 Dahl passing through the shot
    Two supernovae in the galaxy (SN 2003hl & 2003iq) and asteroid 6223 Dahl passing through the shot

See also

References

  1. ^ "Strong-Arming a Galaxy". NOIRLab. Retrieved 30 January 2023.
  2. ^ a b c d e f g h i j "NASA/IPAC Extragalactic Database". Results for NGC 772. Retrieved 2006-11-25.
  3. ^ Stoyan, Ronald; Schurig, Stephan (2014). interstellarum Deep Sky Atlas. Erlangen: Cambridge University Press; Oculum-Verlag GmbH. ISBN 978-1-107-50338-0. OCLC 920437579.
  4. ^ Seligman, Courtney. "NGC 772". Celestial Atlas. Retrieved 17 August 2024.
  5. ^ Rhee, M. H.; van Albada, T. S. (February 1996). "Short WSRT HI observations of spiral galaxies". Astronomy and Astrophysics Supplement. 115: 407–437. Bibcode:1996A&AS..115..407R.
  6. ^ Transient Name Server entry for SN 2003hl. Retrieved 25 March 2023.
  7. ^ Transient Name Server entry for SN 2003iq. Retrieved 25 March 2023.
  8. ^ "NGC 772, Supernovae 2003hl and 2003iq". www.kopernik.org. Retrieved 2022-04-08.
  9. ^ Transient Name Server entry for SN 2022qze. Retrieved 25 March 2023.
  10. ^ Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. (October 1997). "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies". Astrophysical Journal Supplement. 112 (2): 315–390. arXiv:astro-ph/9704107. Bibcode:1997ApJS..112..315H. doi:10.1086/313041. S2CID 17086638.
  11. ^ "A Rival to the Milky Way". ESA Hubble. Retrieved 11 November 2019.



Quelle: https://en.wikipedia.org/wiki/Arp_78