NGC 1022
upright=Hubble Space Telescope image of NGC 1022
Observation data (J2000 epoch)
ConstellationCetus
Right ascension02h 38m 32.74s[1]
Declination−06° 40 38.96[1]
Redshift0.004847[1]
Heliocentric radial velocity1,453 km/s
Distance67.7 Mly (20.75 Mpc)[1]
Apparent magnitude (V)11.34±0.13[2]
Apparent magnitude (B)12.09±0.13[2]
Characteristics
TypeSBa[1]
(R')SB(s)a;HII[2]
SBa(r)p[3]
Apparent size (V)2.4 × 2.0′[2]
Other designations
NGC 1022, PGC 10010

NGC 1022 is a barred spiral galaxy located approximately 68[1] million light years away in the equatorial constellation of Cetus. It was discovered on September 10, 1785 by William Herschel. NGC 1022 is a member of the Cetus-Aries group of galaxies.[3]

This galaxy has a morphological classification SBa,[1] indicating a central bar and tightly-wound spiral arms. The elliptical outline of the galaxy has an isophotal axis ratio of 0.78[1] with an angular size of 2.4 by 2.0 and a position angle of 115°.[2] The galactic plane is inclined at an angle of 24° to the line of sight from the Earth. The central bar is boxy in shape with narrow spurs that are offset from the main axis.[4]

NGC 1022 is forming new stars at an estimated rate of 1.1 solar masses per year. Infrared observations of the nucleus suggests a high rate of star formation activity.[5] The circumnuclear region is home to three giant H II regions with one at the nucleus, a second to the northeast, and the third slightly to the northwest.[3] The galaxy was observed as part of a Hubble study of black holes.[6]

References

  1. 1 2 3 4 5 6 7 8 Ann, H. B.; et al. (2015). "A Catalog of Visually Classified Galaxies in the Local (z ~ 0.01) Universe". The Astrophysical Journal Supplement Series. 217 (2): 27–49. arXiv:1502.03545. Bibcode:2015ApJS..217...27A. doi:10.1088/0067-0049/217/2/27. S2CID 119253507.
  2. 1 2 3 4 5 Gil de Paz, Armando; et al. (December 2007). "The GALEX Ultraviolet Atlas of Nearby Galaxies". The Astrophysical Journal Supplement Series. 173 (2): 185–255. arXiv:astro-ph/0606440. Bibcode:2007ApJS..173..185G. doi:10.1086/516636. S2CID 119085482.
  3. 1 2 3 Franco, José; et al. (November 2000). "Decreasing Density Gradients in Circumnuclear H II Regions of Barred Galaxies NGC 1022, NGC 1326, and NGC 4314". The Astrophysical Journal. 544 (1): 277–282. arXiv:astro-ph/0007040. Bibcode:2000ApJ...544..277F. doi:10.1086/317189. S2CID 119012558.
  4. Erwin, Peter; Debattista, Victor P. (June 2013). "Peanuts at an angle: detecting and measuring the three-dimensional structure of bars in moderately inclined galaxies". Monthly Notices of the Royal Astronomical Society. 431 (4): 3060–3086. arXiv:1301.0638. Bibcode:2013MNRAS.431.3060E. doi:10.1093/mnras/stt385.
  5. Garcia-Barreto, J. A.; et al. (December 1991). "Circumnuclear star formation in the barred galaxy NGC 1022". Astronomy and Astrophysics. 252: 19. Bibcode:1991A&A...252...19G.
  6. Garner, Rob (2020-01-24). "Hubble Sees Dusty Galaxy With Supermassive Center". NASA. Retrieved 2020-06-17.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.