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NGC 1532

Coordinates: Sky map 04h 12m 04.2s, −32° 52′ 30″
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NGC 1532
NGC 1532 with smaller dwarf galaxy NGC 1531 (above)
Observation data (J2000 epoch)
ConstellationEridanus
Right ascension04h 12m 04.3s[1]
Declination−32° 52′ 27″[1]
Redshift1040 ± 5 km/s[1]
Distance57.8 million ly
Apparent magnitude (V)10.7[1]
Characteristics
TypeSB(s)b pec[1]
Size210,000 ly (diameter)
Apparent size (V)12.6′ × 3.3′[1]
Other designations
PGC 14638[1]

NGC 1532, also known as Haley's Coronet,[2] is an edge-on barred spiral galaxy located approximately 50 million light-years from the Solar System in the constellation Eridanus. The galaxy was discovered by James Dunlop on 29 October 1826.[3]

Three supernovae have been observed in NGC 1532: SN 1981A (type unknown, mag. 13.5),[4][5] SN 2016iae (type Ic, mag. 17.3),[6] and SN 2016ija (type II, mag. 16.5).[7]

Bar

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NGC 1532 is one of many edge-on spiral galaxies that possesses a box-shaped bulge. This is an indication that the bulge is actually a bar. Such bars are easy to detect in face-on galaxies, where the structures can be identified visually. In inclined galaxies such as this one, however, careful analyses are needed to distinguish between bulges and bar structures.[8]

Companion galaxies and interactions

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NGC 1532 may possess several dwarf companion galaxies. The galaxy is clearly interacting with one of these galaxies, the amorphous dwarf galaxy NGC 1531. The tidal forces from this interaction have created unusual plumes above the disk of NGC 1532.[9]

NGC 1532 is also an outlying member of the Fornax Cluster.[10]

See also

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  • NGC 4631 – an edge-on spiral galaxy also interacting with a dwarf companion.

References

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  1. ^ a b c d e f g "NASA/IPAC Extragalactic Database". Results for NGC 1532. Retrieved 2006-11-21.
  2. ^ "Spectacular new image of Haley's Coronet". Las Cumbres Observatory. March 10, 2016. Retrieved March 21, 2019.
  3. ^ "New General Catalog Objects: NGC 1500 - 1549". cseligman.com. Retrieved 2017-11-22.
  4. ^ "List of Supernovae". IAU Central Bureau for Astronomical Telegrams. Archived from the original on 11 August 2015. Retrieved 11 July 2015.
  5. ^ Transient Name Server entry for SN 1981A. Retrieved 25 March 2023.
  6. ^ Transient Name Server entry for SN 2016iae. Retrieved 25 March 2023.
  7. ^ Transient Name Server entry for SN 2016ija. Retrieved 25 March 2023.
  8. ^ R. Lütticke; R.-J. Dettmar; M. Pohlen (2000). "Box- and peanut-shaped bulges. I. Statistics". Astronomy and Astrophysics Supplement. 145 (3): 405–414. arXiv:astro-ph/0006359. Bibcode:2000A&AS..145..405L. doi:10.1051/aas:2000354. S2CID 119431696.
  9. ^ A. Sandage; J. Bedke (1994). Carnegie Atlas of Galaxies. Washington, D.C.: Carnegie Institution of Washington. ISBN 978-0-87279-667-6.
  10. ^ Horellou, C.; Casoli, F.; Dupraz, C. (1995). "The CO and HI emission of spiral and lenticular galaxies in the Fornax cluster". Astronomy and Astrophysics. 303: 361. Bibcode:1995A&A...303..361H.
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