Wikipedia

NGC 1325

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
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 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]

A supernova was discovered in this galaxy on December 30, 1975 by Justus Dunlap and Y. Dunlap at Corralitos Observatory.[8] Designated SN 1975S 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]

A core-collapse supernova designated SN 2021yja was detected in this galaxy on September 8, 2021.[11] It was initially categorized as a type II, but may instead be a type Ic.[12]

References edit

  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. ^ 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.
  12. ^ Ryder, S. D.; et al. (September 2021). "Radio observations of SN 2021yja". The Astronomer's Telegram. 14915: 1. Bibcode:2021ATel14915....1R.

External links edit

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