Astronomy:NGC 918

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Short description: Barred spiral galaxy in the constellation Aries
NGC 918
N918s.jpg
NGC 918 by the Mount Lemmon SkyCenter
Observation data (J2000 epoch)
ConstellationAries
Right ascension 02h 25m 50s[1]
Declination+18° 29′ 46″[1]
Redshift0.005027[2]
Helio 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. 1.0 1.1 1.2 1.3 1.4 "NGC 918". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+918. 
  2. 2.0 2.1 2.2 "NASA/IPAC Extragalactic Database". http://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=6740&objname=22&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1#BasicData_0. 
  3. 3.0 3.1 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". https://cseligman.com/text/atlas/ngc32a.htm#3294. 
  5. 5.0 5.1 "Your NED Search Results". http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=ngc+918&img_stamp=YES. 
  6. "NED Query Results for NGC 918". https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+918. 
  7. "APOD: 2009 November 12 - Art and Science in NGC 918". https://apod.nasa.gov/apod/ap091112.html. 
  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". https://www.rochesterastronomy.org/sn2009/sn2009js.html. 
  10. Gandhi, P.; Yamanaka, M.; Tanaka, M.; Nozawa, T.; Kawabata, K. S.; Saviane, I.; Maeda, K.; Moriya, T. J. et al. (2013). "SN 2009js at the Crossroads between Normal and Subluminous Type IIP Supernovae: Optical and Mid-infrared Evolution". The Astrophysical Journal 767 (2): 166. doi:10.1088/0004-637X/767/2/166. Bibcode2013ApJ...767..166G. https://ui.adsabs.harvard.edu/abs/2013ApJ...767..166G/abstract. 
  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. Bibcode2011CBET.2783....1N. https://ui.adsabs.harvard.edu/abs/2011CBET.2783....1N/abstract. 
  12. "Supernova 2011ek in NGC 918". https://www.rochesterastronomy.org/sn2011/sn2011ek.html. 

External links