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NGC 1325

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NGC 1325
Hubble Space Telescope image of NGC 1325
Observation data (J2000 epoch)
ConstellationEridanus
Right ascension03h 25.576m [1]
Declination−21° 32′ 38.61″[1]
Heliocentric radial velocity1,588[2]
Distance75.0 Mly (23.01 Mpc)h−1
0.73[2]
Group or clusterEridanus cluster[3]
Apparent magnitude (V)11.5[4]
Characteristics
TypeSBbc[5]
Apparent size (V)4.47′ × 1.66′[5]
Notable featuresFlocculent spiral galaxy
Other designations
IRAS 03221-2143, NGC 1325, UGCA 70, PGC 12737, ESO 548-7, MCG -4-9-4[5]
References: [6]

NGC 1325 is a flocculent spiral galaxy situated in the constellation of Eridanus. Located about 75 million light years away,[2] it is a member of the Eridanus cluster of galaxies,[3] a cluster of about 200 galaxies. It was discovered by William Herschel on 19 December 1799.

NGC 1325 has a Hubble classification of SBbc, which indicates it is a barred spiral galaxy with moderately wound arms.[5] Its angular size on the night sky is 4.5' x 1.7'.[5] The disk of the galaxy is inclined at an angle of 71° with the main axis aligned along a position angle of 232°.[3] The rotation curve for the galaxy is flat across much of the radius from the core.[7] The galaxy is moving away from the Milky Way with a heliocentric radial velocity of 1,588 km/s.[2]

Supernovae

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Two supernovae have been observed in NGC 1325:

  • SN 1975S was discovered by Justus Dunlap and Y. Dunlap at Corralitos Observatory on 30 December 1975 .[8] Designated with a magnitude of 14.6,[9] it was positioned 53″ east and 77″ north of the galactic nucleus. The color of this supernova and the rapid decline of the lightcurve suggest it was a type II supernova.[10]
  • SN 2021yja (type II-P or type Ic, mag. 15.334) was discovered by ATLAS on September 8, 2021.[11] A core-collapse supernova,[12] it was initially categorized as a type II, but may instead be a type Ic.[13]

References

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  1. ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d Tully, R. Brent; et al. (August 2016). "Cosmicflows-3". The Astronomical Journal. 152 (2): 21. arXiv:1605.01765. Bibcode:2016AJ....152...50T. doi:10.3847/0004-6256/152/2/50. S2CID 250737862. 50.
  3. ^ a b c Angiras, R. A.; et al. (July 2006). "Origin of disc lopsidedness in the Eridanus group of galaxies". Monthly Notices of the Royal Astronomical Society. 369 (4): 1849–1857. arXiv:astro-ph/0604120. Bibcode:2006MNRAS.369.1849A. doi:10.1111/j.1365-2966.2006.10418.x. S2CID 118927254.
  4. ^ Dunlop, Storm (2005). Atlas of the Night Sky. Collins. ISBN 978-0-00-717223-8.
  5. ^ a b c d e Paturel, G.; et al. (December 2003). "HYPERLEDA. I. Identification and designation of galaxies". Astronomy and Astrophysics. 412: 45–55. Bibcode:2003A&A...412...45P. doi:10.1051/0004-6361:20031411.
  6. ^ "NGC 1325". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-12-15.
  7. ^ Mitchell, Carl J.; et al. (March 2018). "The RINGS Survey. III. Medium-resolution Hα Fabry-Pérot Kinematic Data Set". The Astronomical Journal. 155 (3): 28. arXiv:1801.07750. Bibcode:2018AJ....155..123M. doi:10.3847/1538-3881/aaabb8. S2CID 59472535. 123.
  8. ^ Dunlap, J.; Dunlap, Y. (December 1975). Marsden, B. G. (ed.). "Supernova in NGC 1325". IAU Circular. 2893 (1): 1. Bibcode:1975IAUC.2893....1D.
  9. ^ "List of Supernovae", Central Bureau for Astronomical Telegrams, International Astronomical Union, retrieved 2021-12-02.
  10. ^ Wegner, G. (December 1977). "Photometric observations of the supernovae in NGC 7723, NGC 1325 and NGC 4402". Monthly Notices of the Royal Astronomical Society. 181 (4): 677–684. Bibcode:1977MNRAS.181..677W. doi:10.1093/mnras/181.4.677.
  11. ^ "SN 2021yja". Transient Name Server. IAU. Retrieved 2 December 2024.
  12. ^ Smith, K. W.; et al. (September 2021). "ATLAS21bidw (AT2021yja): discovery of a candidate SN in NGC 1325 (22 Mpc)". Transient Name Server AstroNote 2021-235. 235: 1. Bibcode:2021TNSAN.235....1S.
  13. ^ Ryder, S. D.; et al. (September 2021). "Radio observations of SN 2021yja". The Astronomer's Telegram. 14915: 1. Bibcode:2021ATel14915....1R.
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  • Media related to NGC 1325 at Wikimedia Commons
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