NGC 1672
Galaxy in the constellation Dorado
title: "NGC 1672" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["barred-spiral-galaxies", "seyfert-galaxies", "liner-galaxies", "dorado", "ngc-objects", "iras-catalogue-objects", "principal-galaxies-catalogue-objects", "dorado-group", "discoveries-by-james-dunlop", "astronomical-objects-discovered-in-1826"] description: "Galaxy in the constellation Dorado" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/NGC_1672" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Galaxy in the constellation Dorado ::
::data[format=table title="Infobox Galaxy"]
| Field | Value |
|---|---|
| name | NGC 1672 |
| image | NGC1672 - Iotw2205a.jpg |
| caption | NGC 1672 imaged by the Víctor M. Blanco Telescope |
| epoch | J2000 |
| type | (R')SB(r)bc |
| ra | {{cite web |
| url | https://ned.ipac.caltech.edu/byname?objname=NGC+1672 |
| title | Results for object NGC 1672 |
| website | NASA/IPAC Extragalactic Database |
| publisher | California Institute of Technology |
| access-date | 2021-04-29}} |
| dec | |
| dist_ly | 15.86 ± |
| z | 0.004440 |
| h_radial_v | |
| appmag_v | 10.3 |
| size_v | |
| size | ~30.91 kpc (estimated) |
| constellation name | Dorado |
| names | |
| :: |
| name = NGC 1672 | image = NGC1672 - Iotw2205a.jpg | caption = NGC 1672 imaged by the Víctor M. Blanco Telescope | epoch = J2000 | type = (R')SB(r)bc | ra = {{cite web | url = https://ned.ipac.caltech.edu/byname?objname=NGC+1672 | title = Results for object NGC 1672 | website = NASA/IPAC Extragalactic Database | publisher = California Institute of Technology | access-date = 2021-04-29}} | dec = | dist_ly = 15.86 ± | z = 0.004440 | h_radial_v = | appmag_v = 10.3 | size_v = | size = ~30.91 kpc (estimated) | constellation name = Dorado | notes = | names = NGC 1672 is a barred spiral galaxy located in the constellation Dorado. It was discovered by Scottish astronomer James Dunlop on 5 November 1826. It was originally unclear whether it was a member of the Dorado Group, with some sources{{Cite journal | bibcode = 1982ApJ...257..423H | title = Groups of galaxies. I - Nearby groups | doi = 10.1086/160000 | date = June 15, 1982 | journal = Astrophysical Journal | issue = Part 1 | volume = 257 | pages = 423–437 | author = Huchra, J. P. | author2 = Geller, M. J. | bibcode = 1989ApJS...69..809M | date = April 1989 | journal = Astrophysical Journal Supplement Series | issn = 0067-0049 | volume = 69 | pages = 809–829 | doi = 10.1086/191328 | title = A catalog of southern groups of galaxies | author = Maia, M. A. G. | author2 = da Costa, L. N. | author3 = Latham, David W. | doi-access = free
NGC 1672 has a large bar which is estimated to measure around 20 kpc.{{Cite journal | bibcode = 2002A&A...391...83B | title = Magnetic fields in barred galaxies. I. The atlas | date = August 2002 | doi = 10.1051/0004-6361:20020642 | journal = Astronomy and Astrophysics | volume = 391 | issue = 1 | pages = 83–102 | author = Beck, R. |display-authors=4 | author2 = Shoutenkov, V. | author3 = Ehle, M. | author4 = Harnett, J. I. | author5 = Haynes, R. F. | author6 = Shukurov, A. | author7 = Sokoloff, D. D. | author8 = Thierbach, M. |arxiv = astro-ph/0207201 | s2cid = 14749261
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 .{{cite book | author=A. Sandage | author2= J. Bedke | date=1994 | title=Carnegie Atlas of Galaxies | publisher=Carnegie Institution of Washington | location=Washington, D.C. | isbn=978-0-87279-667-6 }}
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:{{cite journal | author=P. Veron | author2=A. C. Goncalves | author3=M. P. Veron-Cetty | title=AGNs with composite spectra | journal=Astronomy and Astrophysics | date=1997 | volume=319 | pages=52–66 | bibcode=1997A&A...319...52V
- A nuclear H II region, a region which has a spectrum similar to that of star formation regions in the Milky Way and which therefore is associated with nuclear star formation activity.
- A Seyfert nucleus, a type of active galactic nucleus (AGN) that may contain a supermassive black hole.
- A low-ionization nuclear emission-line region, a type of nuclear region with spectral line emission from weakly ionized gas that could contain either a star formation region or a supermassive black hole.
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. 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.{{cite journal | author=A. L. Kinney |display-authors=4 | author2=R. C. Bohlin | author3=D. Calzetti|author3-link= Daniela Calzetti | author4=N. Panagia | author5=R. F. G. Wyse | title=An atlas of ultraviolet spectra of star-forming galaxies | journal=Astrophysical Journal Supplement Series | date=1993 | volume=86 | pages=5–93 | bibcode=1993ApJS...86....5K | doi=10.1086/191771| doi-access=free}}
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.
- SN 2022aau (Type II, mag. 16.2788) was discovered by DLT40 on 20 January 2022.
Gallery
NGC 1672 HST.jpg | A Hubble Space Telescope image of the center region of NGC 1672 NGC 1672 GALEX WikiSky.jpg | A GALEX ultraviolet image of NGC 1672 NGC 1672 (weic2403k).jpg | A James Webb Space Telescope image of NGC 1672
References
References
- (2020). "Distance to the Dorado Group". Astrophysical Bulletin.
- Seligman, Courtney. "New General Catalogue objects: NGC 1650 - 1699".
- (2017). "The discovery of DLT17ch/AT 2017gax with PROMPT". The Astronomer's Telegram.
- "SN{{nbsp}}2017gax". [[International Astronomical Union.
- "SN{{nbsp}}2022aau". [[International Astronomical Union.
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