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arXiv 1410.0109astro-ph.GAastro-ph.COastro-ph.IM
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用类星体测量的Milky Way尘埃消光

Milky Way dust extinction measured with QSOs

Christian Wolf

摘要:

我们调查的红银河系尘埃的低消光制度的$E_{B-V}<0.15$。利用SDSS DR7类星体目录中$0.5<z<2.5$的50,000多个类星体,我们探测了去红化和校正已知光谱红移后的剩余SDSS颜色。我们发现Schlafly & Finkbeiner(2011)的灭绝矢量比Schlegel et al.(1998,SFD)使用的灭绝矢量更适合数据。有证据表明,SFD红化图中存在非线性,这在普朗克协作组的V1.2图中也同样存在。当星系或恒星被用作SFD图的探针时,这种非线性也同样可见。

英文摘要:

We investigate reddening by Milky Way dust in the low-extinction regime of $E_{B-V}<0.15$. Using over 50,000 QSOs at $0.5<z<2.5$ from the SDSS DR7 QSO Catalogue we probe the residual SDSS colours after dereddening and correcting for the known spectroscopic redshifts. We find that the extinction vector of Schlafly & Finkbeiner (2011) is a better fit to the data than that used by Schlegel et al. (1998, SFD). There is evidence for a non-linearity in the SFD reddening map, which is similarly present in the V1.2 map of the Planck Collaboration. This non-linearity is similarly seen when galaxies or stars are used as probes of the SFD map.

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