NGC 918
NGC 918 by the Mount Lemmon SkyCenter
Observation data (J2000 epoch)
ConstellationAries
Right ascension02h 25m 50s[1]
Declination+18° 29′ 46″[1]
Redshift0.005027[2]
Heliocentric radial velocity1507 ± 3 km/s[2]
Distance20.6±1.5 mpc [3]
Apparent magnitude (V)15.01[1]
Apparent magnitude (B)16.0[1]
Characteristics
TypeSAB(rs)c[2]
Other designations
NGC 918,MCG+03-07-011, LEDA 9236[1]

NGC 918 is a barred spiral galaxy in the constellation Aries, about 67 million light years from the Milky Way. It was discovered by John Herschel on Jan 11, 1831.[4]

The brightness class of NGC 918 is III and it has a broad line of neutral hydrogen. NGC 918 is also an active nucleus galaxy (AGN). Moreover, it is a field galaxy; that is to say, it does not belong to a cluster or group and is therefore gravitationally isolated.[5]

Many non-redshift measures give a distance of 19,115 ± 6,160 Mpc (~62,3 million ly),[6] which is within the distances calculated using the value shift.[3]

Two supernovae have been observed in this galaxy. SN 2009js (type II, mag. 17.2) was discovered on October 11, 2009.[5][7][8][9] This was the first subluminous supernova to be studied in infrared wavelengths.[10] Supernova SN 2011ek (type Ia, mag. 16.4) was discovered on Aug. 4, 2011 by Kōichi Itagaki.[11][12]

NGC 918 and dust clouds within our Milky Way with the 10th data release of the Legacy Survey.

References

  1. 1 2 3 4 5 "NGC 918". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 June 2019.
  2. 1 2 3 "NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved 19 June 2019.
  3. 1 2 We obtain the distance that separates us from a galaxy using Hubble's law: v = Hod, where Ho is the Hubble constant (70 ± 5 (km / s) / Mpc). The relative uncertainty Δd / d over the distance is equal to the sum of the relative uncertainties of the velocity and Ho.
  4. ↑ Seligman, Courtney. "New General Catalog Objects: NGC 900 - 949". New General Catalog Objects: NGC 900 - 949. Retrieved 19 June 2019.
  5. 1 2 "Your NED Search Results". ned.ipac.caltech.edu.
  6. ↑ "NED Query Results for NGC 918". ned.ipac.caltech.edu.
  7. ↑ "APOD: 2009 November 12 - Art and Science in NGC 918".
  8. ↑ SN 2009js at the Crossroads between Normal and Subluminous Type IIP Supernovae: Optical and Mid-infrared Evolution, The Astrophysical Journal, Volume 767, Issue 2, article id. 166, 15 pp. (2013).
  9. ↑ "Supernova 2009js in NGC 918". www.rochesterastronomy.org.
  10. ↑ Gandhi, P.; Yamanaka, M.; Tanaka, M.; Nozawa, T.; Kawabata, K. S.; Saviane, I.; Maeda, K.; Moriya, T. J.; Hattori, T.; Sasada, M.; Itoh, R. (2013). "SN 2009js at the Crossroads between Normal and Subluminous Type IIP Supernovae: Optical and Mid-infrared Evolution". The Astrophysical Journal. 767 (2): 166. arXiv:1303.1565. Bibcode:2013ApJ...767..166G. doi:10.1088/0004-637X/767/2/166. S2CID 54036464.
  11. ↑ Nakano, S.; Yamaoka, H.; Kadota, K.; Tsuboi, M.; Balam, D. D.; Graham, M. L.; Hsiao, E. Y.; Green, D. W. E. (2011). "Supernova 2011ek near NGC 918 = PSN J02254889+1832000". Central Bureau Electronic Telegrams. 2783: 1. Bibcode:2011CBET.2783....1N.
  12. ↑ "Supernova 2011ek in NGC 918". www.rochesterastronomy.org.


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