Sextans_A

Sextans A

Sextans A

Dwarf irregular galaxy in the constellation Sextans

Sextans A (also known as UGCA 205) is a small dwarf irregular galaxy. It spans about 5000 light-years across, and is located at 4.3 million light-years away, in the outskirts of the Local Group of galaxies, which includes the Milky Way galaxy, and to which Sextans A may or may not belong.

Quick Facts Observation data (J2000 epoch), Constellation ...

Sextans A has a peculiar square shape. Massive short-lived stars exploded in supernovae that caused more star formation, triggering yet more supernovae, ultimately resulting in an expanding shell. Young blue stars now highlight areas and shell edges high in current star formation, which from the perspective of observers on Earth appears roughly square.[5] The 10.4 m telescope Gran Telescopio Canarias recently observed the OB-type stars that power the giant HII regions.[6]

James Webb image of the galaxy

See also

References

  1. [1]
    "NASA/IPAC Extragalactic Database". Results for Sextans A. Retrieved 2006-11-18.
  2. [2]
    Dolphin, Andrew E.; et al. (March 2003). "Deep Hubble Space Telescope Imaging of Sextans A. II. Cepheids and Distance". The Astronomical Journal. 125 (3): 1261–1290. arXiv:astro-ph/0211486. Bibcode:2003AJ....125.1261D. doi:10.1086/346279. S2CID 116691617.
  3. [3]
    I. D. Karachentsev; V. E. Karachentseva; W. K. Hutchmeier; D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal (abstract). 127 (4): 2031–2068. Bibcode:2004AJ....127.2031K. doi:10.1086/382905.
  4. [4]
    Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics. 49 (1): 3–18. Bibcode:2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6. S2CID 120973010.
  5. [5]
    Nemiroff, R.; Bonnell, J., eds. (November 3, 1998). "Sextans A: A Seemingly Square Galaxy". Astronomy Picture of the Day. NASA.
  6. [6]
    Camacho, I.; Garcia, M.; Herrero, A.; Simón-Díaz, S. (2016). "OB stars at the lowest Local Group metallicity". Astronomy & Astrophysics. 585: A82. arXiv:1510.05408. Bibcode:2016A&A...585A..82C. doi:10.1051/0004-6361/201425533. ISSN 0004-6361. S2CID 119162797.
  • Media related to Sextans A at Wikimedia Commons
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