Astronomy:IC 1613
IC 1613 | |
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Observation data (J2000 epoch) | |
Constellation | Cetus |
Right ascension | 01h 04m 47.8s[2] |
Declination | +02° 07′ 04″[2] |
Redshift | −234±1 km/s[2] |
Distance | 2.38±0.07 Mly (730±20 kpc)[3][4] |
Apparent magnitude (V) | 9.9[2] |
Characteristics | |
Type | IB(s)m[2] |
Apparent size (V) | 16.2′ × 14.5′[2] |
Other designations | |
UGC 668,[2] DDO 8,[2] PGC 3844,[2] Caldwell 51 |
IC 1613 (object 1613 in the Index Catalogues (IC), also known as Caldwell 51) is an irregular dwarf galaxy, visible in the constellation Cetus near the star 26 Ceti.[5] It was discovered in 1906 by Max Wolf,[6] and is approaching Earth at 234 km/s.
IC 1613 is a member of the Local Group.[7] It has played an important role in the calibration of the Cepheid variable period-luminosity relation for estimating distances.[8] Other than the Magellanic Clouds, it is one of the few Local Group dwarf irregular galaxy where RR Lyrae-type variables have been observed; this factor, along with an unusually low abundance of interstellar dust both within IC 1613 and along the line of sight enable especially accurate distance estimates.[7][9]
In 1999, Cole et al.[7] used the Hubble Space Telescope to find that the dominant population of this galaxy has an age of ~7 Gyr. Using its Hess diagram, they found that its evolutionary history may be similar to that of the Pegasus Dwarf Irregular Galaxy. Both galaxies are classified as Ir V in the DDO system. Also in 1999, Antonello et al. found five cepheids of Population II in IC 1613, giving self-evident support for the existence of a very old stellar population component of IC 1613. In 1999, King, Modjaz, & Li discovered the first nova ever detected in IC 1613.[10]
![](/wiki/images/thumb/d/df/Caldwell_51_%2850290991758%29.jpg/250px-Caldwell_51_%2850290991758%29.jpg)
IC 1613 contains a WO star known as DR1, which might be the only Wolf–Rayet star in the galaxy,[11][12] although a candidate WC+O binary, SPIRITS14bqe, has been found.[13] The galaxy also contains a Luminous Blue Variable candidate,[14] and a rich population of OB-type[15] stars and OB associations.[16]
There are many faint galaxies close to IC 1613, catalogued as members of the group NOGG H 57.[17]
References
- ↑ "The Milky Way's Clean and Tidy Galactic Neighbour". http://www.eso.org/public/news/eso1603/.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 "NASA/IPAC Extragalactic Database". Results for IC 1613. http://nedwww.ipac.caltech.edu/.
- ↑ I. D. Karachentsev; V. E. Karachentseva; W. K. Hutchmeier; D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal 127 (4): 2031–2068. doi:10.1086/382905. Bibcode: 2004AJ....127.2031K.
- ↑ Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics 49 (1): 3–18. doi:10.1007/s10511-006-0002-6. Bibcode: 2006Ap.....49....3K.
- ↑ Cole, Andrew A.; Tolstoy, Eline; Gallagher III, John S.; Hoessel, John G.; Mould, Jeremy R.; Holtzman, Jon A.; Saha, Abhijit; Ballester, Gilda E. et al. (October 1999). "Stellar Populations at the Center of IC 1613". The Astronomical Journal 118 (4): 1657–1670. doi:10.1086/301042. Bibcode: 1999AJ....118.1657C. http://stacks.iop.org/1538-3881/118/i=4/a=1657.
- ↑ Cole, Andrew A.; Tolstoy, Eline; Gallagher III, John S.; Hoessel, John G.; Mould, Jeremy R.; Holtzman, Jon A.; Saha, Abhijit; Ballester, Gilda E. et al. (October 1999). "Stellar Populations at the Center of IC 1613". The Astronomical Journal 118 (4): 1657–1670. doi:10.1086/301042. Bibcode: 1999AJ....118.1657C. http://stacks.iop.org/1538-3881/118/i=4/a=1657.
- ↑ 7.0 7.1 7.2 Cole, Andrew A.; Tolstoy, Eline; Gallagher, John S., III; Hoessel, John G.; Mould, Jeremy R.; Holtzman, Jon A.; Saha, Abhijit; Ballester, Gilda E. et al. (1999). "Stellar Populations at the Center of IC 1613". The Astronomical Journal 118 (4): 1657–1670. doi:10.1086/301042. Bibcode: 1999AJ....118.1657C.
- ↑ Cole, Andrew A.; Tolstoy, Eline; Gallagher III, John S.; Hoessel, John G.; Mould, Jeremy R.; Holtzman, Jon A.; Saha, Abhijit; Ballester, Gilda E. et al. (October 1999). "Stellar Populations at the Center of IC 1613". The Astronomical Journal 118 (4): 1657–1670. doi:10.1086/301042. Bibcode: 1999AJ....118.1657C. http://stacks.iop.org/1538-3881/118/i=4/a=1657.
- ↑ "The Milky Way's Clean and Tidy Galactic Neighbour". https://www.eso.org/public/news/eso1603/.
- ↑ van den Bergh, Sidney (April 2000). "Updated Information on the Local Group". The Publications of the Astronomical Society of the Pacific 112 (770): 529–536. doi:10.1086/316548. Bibcode: 2000PASP..112..529V.
- ↑ Neugent, Kathryn; Massey, Philip (2019-08-01). "The Wolf–Rayet Content of the Galaxies of the Local Group and Beyond". Galaxies 7 (3): 74. doi:10.3390/galaxies7030074. Bibcode: 2019Galax...7...74N.
- ↑ Tramper, F.; Straal, S. M.; Sanyal, D.; Sana, H.; De Koter, A.; Gräfener, G.; Langer, N.; Vink, J. S. et al. (2015). "Massive stars on the verge of exploding: The properties of oxygen sequence Wolf–Rayet stars". Astronomy & Astrophysics 581: A110. doi:10.1051/0004-6361/201425390. Bibcode: 2015A&A...581A.110T.
- ↑ Lau, Ryan M.; Hankins, Matthew J.; Kasliwal, Mansi M.; Bond, Howard E.; De, Kishalay; Jencson, Jacob E.; Moffat, Anthony F. J.; Smith, Nathan et al. (2021-03-01). "Revealing Efficient Dust Formation at Low Metallicity in Extragalactic Carbon-rich Wolf–Rayet Binaries". The Astrophysical Journal 909 (2): 113. doi:10.3847/1538-4357/abd8cd. ISSN 0004-637X. Bibcode: 2021ApJ...909..113L.
- ↑ Herrero, A.; Garcia, M.; Uytterhoeven, K.; Najarro, F.; Lennon, D. J.; Vink, J. S.; Castro, N. (2010). "The nature of V39: an LBV candidate or LBV impostor in the very low metallicity galaxy IC 1613?" (in en). Astronomy and Astrophysics 513: A70. doi:10.1051/0004-6361/200913562. ISSN 0004-6361. Bibcode: 2010A&A...513A..70H.
- ↑ Garcia, M.; Herrero, A. (2013). "The young stellar population of IC 1613" (in en). Astronomy & Astrophysics 551: A74. doi:10.1051/0004-6361/201219977. ISSN 0004-6361. Bibcode: 2013A&A...551A..74G.
- ↑ Garcia, M.; Herrero, A.; Castro, N.; Corral, L.; Rosenberg, A. (2012). "The young stellar population of IC 1613" (in en). Astronomy & Astrophysics 523: A23. doi:10.1051/0004-6361/201015243. ISSN 0004-6361. Bibcode: 2010A&A...523A..23G.
- ↑ G. Giuricin; C. Marinoni; L. Ceriani; A. Pisani (2000). "Nearby Optical Galaxies: Selection of the Sample and Identification of Groups". Astrophysical Journal 543 (1): 178–194. doi:10.1086/317070. Bibcode: 2000ApJ...543..178G.
External links
- IC 1613 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 01h 04m 47.8s, +02° 07′ 04″
![]() | Original source: https://en.wikipedia.org/wiki/IC 1613.
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