arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0907.4844astro-ph.CO
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Local Group星暴星系IC 10的变红和距离

Reddening and Distance of the Local Group Starburst Galaxy IC 10

Minsun Kim, Eunhyeuk Kim, Narae Hwang, Myung Gyoon Lee, Myungshin Im, Hiroshi Karoji, Junichi Noumaru, and Ichi Tanaka

摘要:

我们估计的红化和距离最近的星爆星系IC 10使用深近红外$JHK_{S}$测光获得的多目标红外相机和光谱仪(MOIRCS)的斯巴鲁望远镜。利用本星群巡天中IC 10的PDMATHAMN测光估算了IC 10的前景红化,得到了$E(B-V)=0.52\pm 0.04$ mag,利用IC 10中早型星的PDMATHAMN测光,通过比较IC 10和SMC中红巨星分支星的$JHK_{S}$测光,得到了包括内部红化在内的总红化,$E(B-V)=0.98\pm 0.06$ mag.利用20个球状星团的2 MASS点源星表,导出了[Fe/H] $_{CG97}$与$K_{S}- (J-K_{S})$色星等图中红巨星分支斜率之间的关系。IC 10中红巨星分支星的平均金属丰度估计为[Fe/H] $_{CG97}=-1.08\pm0.28$。IC 10的红巨星分支(TRGB)的顶端在$K_{S}$带的星等被测量为$K_{S,TRGB}=18.28\pm0.01$。基于TRGB方法,我们估计IC 10的距离模为$(m-M)_{0}=24.27\pm0.03{\rm (random)}\pm0.18{\rm (systematic)}$,对应于$d=715\pm10\pm60$ kpc的距离。这确认IC 10是本地组的成员。

英文摘要:

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.

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