NGC 918 explained

NGC 918
Constellation Name:Aries
Epoch:J2000
Type:SAB(rs)c[1]
Ra:[2]
Dist Ly:20.6±1.5 mpc [3]
Appmag B:16.0
Appmag V:15.01
Z:0.005027
Names:NGC 918,MCG+03-07-011, LEDA 9236

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]

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . ned.ipac.caltech.edu . 19 June 2019 .
  2. NGC 918. 19 June 2019.
  3. 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. Web site: Seligman . Courtney . New General Catalog Objects: NGC 900 - 949 . New General Catalog Objects: NGC 900 - 949 . 19 June 2019.
  5. Web site: Your NED Search Results. ned.ipac.caltech.edu.
  6. Web site: NED Query Results for NGC 918. ned.ipac.caltech.edu.
  7. Web site: APOD: 2009 November 12 - Art and Science in NGC 918.
  8. https://ui.adsabs.harvard.edu/abs/2013ApJ...767..166G/abstract SN 2009js at the Crossroads between Normal and Subluminous Type IIP Supernovae: Optical and Mid-infrared Evolution
  9. Web site: Supernova 2009js in NGC 918. www.rochesterastronomy.org.
  10. SN 2009js at the Crossroads between Normal and Subluminous Type IIP Supernovae: Optical and Mid-infrared Evolution. 2013ApJ...767..166G. Gandhi. P.. Yamanaka. M.. Tanaka. M.. Nozawa. T.. Kawabata. K. S.. Saviane. I.. Maeda. K.. Moriya. T. J.. Hattori. T.. Sasada. M.. Itoh. R.. The Astrophysical Journal. 2013. 767. 2. 166. 10.1088/0004-637X/767/2/166. 1303.1565. 54036464.
  11. Supernova 2011ek near NGC 918 = PSN J02254889+1832000. 2011CBET.2783....1N. Nakano. S.. Yamaoka. H.. Kadota. K.. Tsuboi. M.. Balam. D. D.. Graham. M. L.. Hsiao. E. Y.. Green. D. W. E.. Central Bureau Electronic Telegrams. 2011. 2783. 1.
  12. Web site: Supernova 2011ek in NGC 918. www.rochesterastronomy.org.

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