IC 1613
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| IC 1613 | |
| Observation data (J2000 epoch) | |
|---|---|
| Constellation | Cetus |
| Right ascension | 01h 04m 47.8s[1] |
| Declination | +02° 07′ 04″[1] |
| Redshift | -234 ± 1 km/s[1] |
| Distance | 2.38 ± 0.07 Mly (730 ± 20 kpc)[2][3] |
| Type | IB(s)m[1] |
| Apparent dimensions (V) | 16′.2 × 14′.5[1] |
| Apparent magnitude (V) | 9.9[1] |
| Notable features | - |
| Other designations | |
| UGC 668,[1] DDO 8,[1] PGC 3844[1] | |
| See also: Galaxy, List of galaxies | |
IC 1613 is an irregular galaxy and a dwarf galaxy in the Cetus constellation near 26 Ceti.[4] It was discovered in 1906 by Max Wolf,[4] and is approaching earth at 234 km/s.
IC 1613 is a member of our Local Group.[4] It has played an important role in the calibration of the Cepheid variable period luminosity relation for estimating distances.[4] Other than the Magellanic Clouds, it is the only Local Group dwarf irregular galaxy where RR Lyrae-type variables have been observed.[4]
In 1999, Cole et al.[4] 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 dIrr. Both galaxies are classified as Ir V in the DDO system. Also in 1999, Antonello et al. found five cephids 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 supernova ever detected in IC 1613.[5]
[edit] References
- ^ a b c d e f g h i NASA/IPAC Extragalactic Database. Results for IC 1613. Retrieved on 2006-11-29.
- ^ I. D. Karachentsev, V. E. Karachentseva, W. K. Hutchmeier, D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal 127: 2031–2068. doi:.
- ^ 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:.
- ^ a b c d e f Cole, Andrew A.; Tolstoy, Eline; Gallagher, John S., III; Hoessel, John G.; Mould, Jeremy R.; Holtzman, Jon A.; Saha, Abhijit; Ballester, Gilda E.; Burrows, Christopher J.; Clarke, John T.; Crisp, David; Griffiths, Richard E.; Grillmair, Carl J.; Hester, Jeff J.; Krist, John E.; Meadows, Vikki; Scowen, Paul A.; Stapelfeldt, Karl R.; Trauger, John T.; Watson, Alan M.; Westphal, James R. (1999). "Stellar Populations at the Center of IC 1613". The Astronomical Journal 118 (4): 1657–1670. doi:.
- ^ 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, <http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2000PASP..112..529V>
