Astronomy:IC 1613

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Short description: Irregular dwarf galaxy in the constellation Cetus
IC 1613
Dwarf galaxy IC 1613.jpg
IC 1613 captured with the VLT's OmegaCAM.[1]
Observation data (J2000 epoch)
ConstellationCetus
Right ascension 01h 04m 47.8s[2]
Declination+02° 07′ 04″[2]
Redshift−234±1 km/s[2]
Distance2.38±0.07 Mly (730±20 kpc)[3][4]
Apparent magnitude (V)9.9[2]
Characteristics
TypeIB(s)m[2]
Apparent size (V)16.2′ × 14.5′[2]
Other designations
UGC 668,[2] DDO 8,[2] PGC 3844,[2] Caldwell 51
The sky around IC 1613, with 26 Ceti towards the bottom of the frame (south) and 29 Ceti to the left (east)

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]

Hubble image of the central part of IC 1613, showing the faint galaxies of NOGG H 57

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

  1. ↑ "The Milky Way's Clean and Tidy Galactic Neighbour". http://www.eso.org/public/news/eso1603/. 
  2. ↑ 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/. 
  3. ↑ 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. 
  4. ↑ 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. 
  5. ↑ 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. 
  6. ↑ 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. ↑ 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. 
  8. ↑ 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. 
  9. ↑ "The Milky Way's Clean and Tidy Galactic Neighbour". https://www.eso.org/public/news/eso1603/. 
  10. ↑ 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. 
  11. ↑ 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. 
  12. ↑ 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. 
  13. ↑ 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. 
  14. ↑ 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. 
  15. ↑ 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. 
  16. ↑ 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. 
  17. ↑ 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

Coordinates: Sky map 01h 04m 47.8s, +02° 07′ 04″



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