REDDENING AND DISTANCE OF THE LOCAL GROUP STARBURST GALAXY IC 10
| Autor: | Eunhyeuk Kim, Myungshin Im, Tanaka, Minsun Kim, Junichi Noumaru, Myung Gyoon Lee, Hiroshi Karoji, Narae Hwang, Ichi |
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| Rok vydání: | 2009 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Metallicity FOS: Physical sciences Local Group Astronomy and Astrophysics Astrophysics Galaxy Photometry (optics) Red-giant branch Stars Distance modulus Space and Planetary Science Globular cluster Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | The Astrophysical Journal. 703:816-828 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | We estimate the reddening and distance of the nearest starburst galaxy IC 10 using deep near infrared $JHK_{S}$ photometry obtained with the Multi-Object InfraRed Camera and Spectrograph (MOIRCS) on the Subaru telescope. We estimate the foreground reddening toward IC 10 using $UBV$ photometry of IC 10 from the Local Group Survey, obtaining $E(B-V)=0.52\pm 0.04$ mag. We derive the total reddening including the internal reddening, $E(B-V)=0.98\pm 0.06$ mag, using $UBV$ photometry of early-type stars in IC 10 and comparing $JHK_{S}$ photometry of red giant branch stars in IC 10 and the SMC. Using the 2MASS point source catalog of 20 Galactic globular clusters, we derive a relation between the metallicity [Fe/H]$_{CG97}$ and the slope of the red giant branch in the $K_{S}- (J-K_{S})$ color-magnitude diagram. The mean metallicity of the red giant branch stars in IC 10 is estimated to be [Fe/H]$_{CG97}=-1.08\pm0.28$. The magnitude of the tip of the red giant branch (TRGB) of IC 10 in the $K_{S}$ band is measured to be $K_{S,TRGB}=18.28\pm0.01$. Based on the TRGB method, we estimate the distance modulus of IC 10 to be $(m-M)_{0}=24.27\pm0.03{\rm (random)}\pm0.18{\rm (systematic)}$, corresponding to the distance of $d=715\pm10\pm60$ kpc. This confirms that IC 10 is a member of the Local Group. Comment: 35 pages, 11 figures, To appear in the Astrophysical Journal, 2009 |
| Databáze: | OpenAIRE |
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