Extinction Ratios in the Inner Galaxy as Revealed by the VVV Survey
Extinction Ratios in the Inner Galaxy as Revealed by the VVV Survey
复制标题
DOI：
10.3847/2041-8213/aa92c3
复制
发表时间：
2017-10
期刊：
影响因子：
--
通讯作者：
J. Alonso-Garc'ia;D. Minniti;M. Catelán;R. Contreras Ramos;O. Gonzalez;M. Hempel;P. Lucas;R. Sait
中科院分区：
文献类型：
--
作者：
J. Alonso-Garc'ia;D. Minniti;M. Catelán;R. Contreras Ramos;O. Gonzalez;M. Hempel;P. Lucas;R. Sait
朝向银河系中心（GC）的星际消光是巨大的，并且有显著的差异。它的变红和变暗的影响，在红团（RC）在银河系隆起的恒星可以被利用，以更好地限制消光定律向最里面的星系。凭借一个深入和完整的目录，超过30万个对象，并从VVV调查观测，我们应用RC方法来推断选择总消光比在Z，Y，J，H，和Ks宽带近红外滤波器。测量值小于先前报告的值，并且不是恒定的，例如，和.我们还获得了AZ：AY：AJ：AH：的比率为7.74：5.38：3.30：1.88：1.0，这意味着对GC的消光遵循比先前报道的更陡峭的波长的函数分布，与近红外的幂律一致。
Interstellar extinction toward the Galactic Center (GC) is large and significantly differential. Its reddening and dimming effects in red clump (RC) stars in the Galactic Bulge can be exploited to better constrain the extinction law toward the innermost Galaxy. By virtue of a deep and complete catalog of more than 30 million objects at and obtained from VVV survey observations, we apply the RC method to infer the selective-to-total extinction ratios in the Z, Y, J, H, and Ks broadband near-infrared filters. The measured values are smaller than previously reported, and are not constant, with mean values of, e.g., and . We also obtain a ratio AZ:AY:AJ:AH: of 7.74:5.38:3.30:1.88:1.0, implying extinction toward the GC to follow a distribution as a function of wavelength steeper than previously reported, consistent with a power law in the near-infrared.