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NGC 1325
Hubble Space Telescope image of NGC 1325
Observation data ( J2000 epoch)
Constellation Eridanus
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 cluster Eridanus 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]

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

  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

  • Media related to NGC 1325 at Wikimedia Commons
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