论文标题

麦哲伦云中的灰尘分布

Dust distributions in the Magellanic Clouds

论文作者

Chen, B. -Q., Guo, H. -L., Gao, J., Yang, M., Liu, Y. -L., Jiang, B. -W.

论文摘要

我们介绍了麦哲伦云(MCS)中灰尘变红的高分辨率地图。地图覆盖了大小的麦哲伦云(LMC和SMC)区域,并在$ \ sim $ 26 Arcsec和55 Arcmin之间具有空间分辨率。基于来自光学和近红外(IR)光度测量的数据,包括Gaia调查,Skymapper Southern调查(SMSS),对麦芽岩恒星历史(Smash)的调查,两个微米全部调查(2mass)和近境的$ yjk _ YJK _ {\ yjk _ {\ rm {\ rm {获得了LMC和SMC区域中包含超过600万颗恒星的多波段光度恒星样品。基于Gaia早期数据版本3(Gaia EDR3)的单个恒星的适当运动和视差的测量,我们建立了包含LMC,SMC和Milky Way(MW)恒星的干净样品。我们将光谱能分布(SED)拟合应用于单个样品恒星以估计其红色值。结果,我们在LMC中得出了约190万颗恒星,在SMC中的150万颗恒星和MW中有60万颗恒星,用于在MCS中构造灰尘红色的地图。我们的地图与文献的地图一致。所得的MC中的高分辨率灰尘图不仅是对MC中校正校正的重要工具,而且是研究两个星系中灰尘分布和性质的基础。

We present high-resolution maps of the dust reddening in the Magellanic Clouds (MCs). The maps cover the Large and Small Magellanic Cloud (LMC and SMC) area and have a spatial angular resolution between $\sim$ 26 arcsec and 55 arcmin. Based on the data from the optical and near-infrared (IR) photometric surveys, including the Gaia Survey, the SkyMapper Southern Survey (SMSS), the Survey of the Magellanic Stellar History (SMASH), the Two Micron All Sky Survey (2MASS) and the near-infrared $YJK_{\rm{S}}$ VISTA survey of the Magellanic Clouds system (VMC), we have obtained multi-band photometric stellar samples containing over 6 million stars in the LMC and SMC area. Based on the measurements of the proper motions and parallaxes of the individual stars from Gaia Early Data Release 3 (Gaia EDR3), we have built clean samples that contain stars from the LMC, SMC and Milky Way (MW), respectively. We apply the spectral energy distribution (SED) fitting to the individual sample stars to estimate their reddening values. As a result, we have derived the best-fitting reddening values of ~ 1.9 million stars in the LMC, 1.5 million stars in the SMC and 0.6 million stars in the MW, which are used to construct dust reddening maps in the MCs. Our maps are consistent with those from the literature. The resultant high-resolution dust maps in the MCs are not only important tools for reddening correction of sources in the MCs, but also fundamental for the studies of the distribution and properties of dust in the two galaxies.

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