NGC 1672

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NGC 1672
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NGC 1672 imaged by the Víctor M. Blanco Telescope
Observation data (J2000 epoch)
ConstellationDorado
Right ascensionTemplate:RA[1]
DeclinationTemplate:DEC[1]
Redshift0.004440[1]
Heliocentric radial velocity1,331±3 km/s[1]Template:R/superscript
DistanceTemplate:Cvt[2]
Apparent magnitude (V)10.3[1]
Characteristics
Type(R')SB(r)bc[1]
Size~100,800 ly (30.91 kpc) (estimated)[1]Template:R/superscript
Apparent size (V)6.6′ × 5.5′[1]Template:R/superscript
Other designations
Template:Odlist[1]

NGC 1672 is a barred spiral galaxy located in the constellation Dorado. It was discovered by Scottish astronomer James Dunlop on 5 November 1826.[3] It was originally unclear whether it was a member of the Dorado Group, with some sources[4] finding it to be a member and other sources[5] rejecting its membership. However, recent tip of the red-giant branch (TRGB) measurements indicate that NGC 1672 is located at the same distance as other members, suggesting it is indeed a member of the Dorado Group.[2]

NGC 1672 has a large bar which is estimated to measure around 20 kpc.[6] It has very strong radio emissions emanating from its nucleus, bar, and the inner portion of the spiral arm region.[6] The nucleus is Seyfert type II and is engulfed by a starburst region.[6] The strongest polarized emissions come from the northeastern region which is upstream from its dust lanes.[6] Magnetic field lines are at large angles with respect to the bar and turn smoothly to the center.[6]

General structure

The center of the galaxy contains a high surface brightness bar, and four filament-like spiral arms extend outward from the ends of this bar. The spiral arms are asymmetric; one of the arms in the northeast part of the disk is significantly brighter than its counterpart on the other side. The spiral arms also contain numerous star formation regions, some of which may be as large as Template:Pprime.[7]

Nucleus

The classification of the nucleus of NGC 1672 is uncertain. Most galaxies may be classified by their spectra as having one of three different types of nuclei:[8]

NGC 1672, however, is one of several nearby galaxies that does not fit into this classification scheme, as its spectrum appears intermediary between these three classes of objects.[8] It may in fact contain both nuclear star formation regions and an AGN. In some wave bands (such as in ultraviolet light), the star formation regions are the primary source of emission.[9]

Supernovae

Two supernovae have been observed in NGC 1672:

  • SN 2017gax (Type Ib/c, mag. 17.0406) was discovered by the Distance Less Than 40 Mpc Survey (DLT40) on 14 August 2017.[10][11]
  • SN 2022aau (Type II, mag. 16.2788) was discovered by DLT40 on 20 January 2022.[12]

See also

References

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  1. ^ a b c d e f g h i Page Module:Citation/CS1/styles.css has no content."Results for object NGC 1672". NASA/IPAC Extragalactic Database. California Institute of Technology. Retrieved 2021-04-29.
  2. ^ a b Page Module:Citation/CS1/styles.css has no content.Tikhonov, N. A.; Galazutdinova, O. A. (2020). "Distance to the Dorado Group". Astrophysical Bulletin. 75 (4): 384–393. arXiv:2009.04090. Bibcode:2020AstBu..75..384T. doi:10.1134/S199034132004015X. S2CID 221556782.
  3. ^ Page Module:Citation/CS1/styles.css has no content.Seligman, Courtney. "New General Catalogue objects: NGC 1650 - 1699". cseligman.com. Retrieved 2021-04-29.
  4. ^ Page Module:Citation/CS1/styles.css has no content.Huchra, J. P.; Geller, M. J. (June 15, 1982). "Groups of galaxies. I - Nearby groups". Astrophysical Journal. 257 (Part 1): 423–437. Bibcode:1982ApJ...257..423H. doi:10.1086/160000.
  5. ^ Page Module:Citation/CS1/styles.css has no content.Maia, M. A. G.; da Costa, L. N.; Latham, David W. (April 1989). "A catalog of southern groups of galaxies". Astrophysical Journal Supplement Series. 69: 809–829. Bibcode:1989ApJS...69..809M. doi:10.1086/191328. ISSN 0067-0049.
  6. ^ a b c d e Page Module:Citation/CS1/styles.css has no content.Beck, R.; Shoutenkov, V.; Ehle, M.; Harnett, J. I.; et al. (August 2002). "Magnetic fields in barred galaxies. I. The atlas". Astronomy and Astrophysics. 391 (1): 83–102. arXiv:astro-ph/0207201. Bibcode:2002A&A...391...83B. doi:10.1051/0004-6361:20020642. S2CID 14749261.
  7. ^ Page Module:Citation/CS1/styles.css has no content.A. Sandage; J. Bedke (1994). Carnegie Atlas of Galaxies. Washington, D.C.: Carnegie Institution of Washington. ISBN 978-0-87279-667-6.
  8. ^ a b Page Module:Citation/CS1/styles.css has no content.P. Veron; A. C. Goncalves; M. P. Veron-Cetty (1997). "AGNs with composite spectra". Astronomy and Astrophysics. 319: 52–66. Bibcode:1997A&A...319...52V.
  9. ^ Page Module:Citation/CS1/styles.css has no content.A. L. Kinney; R. C. Bohlin; D. Calzetti; N. Panagia; et al. (1993). "An atlas of ultraviolet spectra of star-forming galaxies". Astrophysical Journal Supplement Series. 86: 5–93. Bibcode:1993ApJS...86....5K. doi:10.1086/191771.
  10. ^ Page Module:Citation/CS1/styles.css has no content.Tartaglia, L.; Sand, D.; Wyatt, S.; Valenti, S.; Bostroem, K. A.; Reichart, D. E.; Haislip, J. B.; Kouprianov, V. (2017). "The discovery of DLT17ch/AT 2017gax with PROMPT". The Astronomer's Telegram. 10638: 1. Bibcode:2017ATel10638....1T.
  11. ^ Page Module:Citation/CS1/styles.css has no content."SN 2017gax". Transient Name Server. IAU. Retrieved 11 March 2025.
  12. ^ Page Module:Citation/CS1/styles.css has no content."SN 2022aau". Transient Name Server. IAU. Retrieved 11 March 2025.

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