Astronomy:NGC 1325

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Short description: Galaxy in the constellation Eridanus
NGC 1325
NGC 1325 -HST09042 18-R814GB450.png
Hubble Space Telescope image of NGC 1325
Observation data (J2000 epoch)
ConstellationEridanus
Right ascension 03h 25.576m[1]
Declination−21° 32′ 38.61″[1]
Helio radial velocity1,588[2]
Distance75.0 Mly (23.01 Mpc)h−10.73[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, 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. ↑ 1.0 1.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Tully, R. Brent et al. (August 2016). "Cosmicflows-3". The Astronomical Journal 152 (2): 21. doi:10.3847/0004-6256/152/2/50. 50. Bibcode: 2016AJ....152...50T. 
  3. ↑ 3.0 3.1 3.2 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. doi:10.1111/j.1365-2966.2006.10418.x. Bibcode: 2006MNRAS.369.1849A. 
  4. ↑ Dunlop, Storm (2005). Atlas of the Night Sky. Collins. ISBN 978-0-00-717223-8. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Paturel, G. et al. (December 2003). "HYPERLEDA. I. Identification and designation of galaxies". Astronomy and Astrophysics 412: 45–55. doi:10.1051/0004-6361:20031411. Bibcode: 2003A&A...412...45P. 
  6. ↑ "NGC 1325". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+1325. 
  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. doi:10.3847/1538-3881/aaabb8. 123. Bibcode: 2018AJ....155..123M. 
  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, International Astronomical Union, http://www.cbat.eps.harvard.edu/lists/Supernovae.html, 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. doi:10.1093/mnras/181.4.677. Bibcode: 1977MNRAS.181..677W. 
  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. 

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