用近红外和中红外宽带测光法研究银河系中心的消光：对瑞利-金斯色余法的一种改进
Extinction at the Galactic Center Using Near- and Mid-infrared Broadband Photometry: A Twist on the Rayleigh-Jeans Color Excess Method
摘要：
我们提出了一个消光图的内部$\sim$ \SI{15}{\arcminute}由{16}{ \arcminute }的银河系中心（GC）与地图“像素”测量\SI{5}{\arcsecond} $\times$ \SI{5}{\arcsecond}使用集成光的颜色测量在近红外和中红外。我们使用Mauriski等人（2011）首次描述的Rayleigh-Jeans Color Excess（RJCE）方法的变体作为我们工作的基础，尽管我们已经用贝叶斯思维方式解决了我们的问题，并放弃了点源测光，支持表面测光，将GC极其拥挤的领域的挑战转化为优势。我们的研究结果表明，在GC消光是不一致的一个单一的幂律系数，$β=2.03\pm0.06$，并比较我们的结果与使用红团（RC）点源光度法消光估计。我们发现，我们的测量$β$和它的明显缺乏空间变化是在协议与以前的研究，尽管双峰分布的值在我们的消光图在GC与峰值在\num{5}和\SI{7.5}{mag}。灭绝的这种双峰性质很可能是由于遮蔽了部分内部GC场的深红黑云。我们使用DeWitt等人（2010）编制的红外源的点源目录，提出了我们的消光定律和地图，以及GC区域的去红近红外CMD和颜色-颜色图。去红化受到消光测量（通常是\SI{0.6}{mag}）误差的限制，这受到我们地图像素大小的影响，并且没有足够的细粒度来分离出GC中存在的多个恒星种群。
英文摘要：
We present an extinction map of the inner $\sim$\SI{15}{\arcminute} by {16}{\arcminute} of the Galactic Center (GC) with map `pixels' measuring \SI{5}{\arcsecond} $\times$ \SI{5}{\arcsecond} using integrated light color measurements in the near- and mid-infrared. We use a variant of the Rayleigh-Jeans Color Excess (RJCE) method first described by Majewski et al. (2011) as the basis of our work, although we have approached our problem with a Bayesian mindset and dispensed with point-source photometry in favor of surface photometry, turning the challenge of the extremely crowded field at the GC into an advantage. Our results show that extinction at the GC is not inconsistent with a single power law coefficient, $β=2.03\pm0.06$, and compare our results with those using the Red Clump (RC) point-source photometry method of extinction estimation. We find that our measurement of $β$ and its apparent lack of spatial variation are in agreement with prior studies, despite the bimodal distribution of values in our extinction map at the GC with peaks at \num{5} and \SI{7.5}{mag}. This bimodal nature of extinction is likely due to the InfraRed Dark Clouds that obscure portions of the inner GC field. We present our extinction law and map and de-reddened NIR CMDs and color-color diagram of the GC region using the point-source catalog of IR sources compiled by DeWitt et al. (2010). The de-reddening is limited by the error in the extinction measurement (typically \SI{0.6}{mag}), which is affected by the size of our map pixels and is not fine-grained enough to separate out the multiple stellar populations present toward the GC.
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