论文标题
使用近红外和中红外宽带光度法在银河中心的灭绝：雷利 - 吉恩斯颜色多余的方法的扭曲
Extinction at the Galactic Center Using Near- and Mid-infrared Broadband Photometry: A Twist on the Rayleigh-Jeans Color Excess Method
论文作者
论文摘要
我们通过{16} {16} {\ arcminute}的内在$ \ sim $ \ si $ \ si {15} {\ arcminute} {\ arcminute}，带有映射的映射“像素”测量\ si {5} {5} {\ arcsececon {\ arcsecsecs $ \ si {5}近红外和中红外的集成浅色测量。我们使用Majewski等人首先描述的Rayleigh-Jeans颜色过量（RJCE）的变体。 （2011年）作为我们工作的基础，尽管我们以贝叶斯的心态解决了问题，并以点源光度法分配了支持表面光度法，这使GC极度拥挤的领域的挑战变成了优势。我们的结果表明，GC处的灭绝与单个功率定律系数并不矛盾，$β= 2.03 \ pm0.06 $，并将我们的结果与使用红色团（RC）点源灭绝估算的估计的结果进行比较。我们发现，尽管我们在GC处的灭绝图中的双峰分布在\ num {5}和\ si {7.5} {mag} {mag}的峰值上，我们对$β$及其明显缺乏空间变化的测量与先前的研究一致。这种灭绝的双峰性质可能是由于红云造成了内部GC场的一部分。我们使用Dewitt等人编制的IR源点源目录介绍了我们的灭绝定律和地图，并取消了GC区域的NIR CMDS和GC区域的颜色彩色图。 （2010）。脱落的限制受灭绝测量中的误差（通常为\ si {0.6} {mag}），该{0.6} {mag}）受我们的地图像素大小的影响，并且不足以分离出存在的多个恒星群体向GC分开。
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.
