REDDENING AND DISTANCE OF THE LOCAL GROUP STARBURST GALAXY IC 10

Journal Article · Sun Sep 20 00:00:00 EDT 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/703/1/816· OSTI ID:21371949

Kim, Minsun ^[1]; Kim, Eunhyeuk; Hwang, Narae; Lee, Myung Gyoon; Im, Myungshin ^[2]; Karoji, Hiroshi; Noumaru, Junichi; Tanaka, Ichi ^[3]

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1. International Center for Astrophysics, Korea Astronomy and Space Science Institute, Daejeon 305-348 (Korea, Republic of)
2. Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-742 (Korea, Republic of)
3. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588 (Japan)

We estimate the reddening and distance of the nearest starburst galaxy IC 10 using deep near-infrared JHK {sub 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 the UBV photometry of IC 10 from the Local Group Survey, obtaining E(B - V) = 0.52 +- 0.04 mag. We derive the total reddening including the internal reddening, E(B - V) = 0.98 +- 0.06 mag, using the UBV photometry of early-type stars in IC 10 and comparing the JHK {sub S} photometry of red giant branch stars in IC 10 and the Small Magellanic Cloud. Using the Two Micron All Sky Survey point-source catalog of 20 Galactic globular clusters, we derive a relation between the metallicity [Fe/H]{sub CG97} and the slope of the red giant branch in the K {sub S} - (J - K {sub S}) color-magnitude diagram. The mean metallicity of the red giant branch stars in IC 10 is estimated to be [Fe/H]{sub CG97} = -1.08 +- 0.28. The magnitude of the tip of the red giant branch (TRGB) of IC 10 in the K {sub S} band is measured to be K {sub S,TRGB} = 18.28 +- 0.01. Based on the TRGB method, we estimate the distance modulus of IC 10 to be (m - M){sub 0} = 24.27 +- 0.03(random) +- 0.18(systematic), corresponding to the distance of d = 715 +- 10 +- 60 kpc. This confirms that IC 10 is a member of the Local Group.

• OSTI ID: 21371949
• Journal Information: Astrophysical Journal, Vol. 703, Issue 1; Other Information: DOI: 10.1088/0004-637X/703/1/816; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COLOR
MAGELLANIC CLOUDS
PHOTOMETRY
POINT SOURCES
STARS
TELESCOPES
GALAXIES
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES
RADIATION SOURCES