基于GLIMPSE数据测定1.25至8.0微米范围内星际消光的波长依赖性
天体物理学
2008-11-26 v2
摘要
我们确定并列出在银河平原上，波长范围为1.25μm<λ<8.0μm的星际消光A(λ)/A(K) along两条视线：l~42和l~284。前者是一个相对平静且无特别标志的区域；后者包含巨型HII区RCW 49以及与簇和星云无关的“场”区域。这些银河赤道附近的区域被2MASS在J、H、K波段成像，并被斯普特伦在3-8μm波段成像，以完成GLIMPSE遗产计划。我们直接从观测星体的颜色分布中测量颜色剩余比值(A(λ)-A(K))/(A(J)-A(K)的平均值。需要两种滤光器之间的消光比（例如A(J)/A(K)）才能计算A(λ)/A(K)。我们使用沿两个视线的巨型星体的 apparent JHK magnitudes，并拟合随magnitude（距离）变化的消光，以确定A(J)/kpc、A(K)/kpc和A(J)/A(K)。我们得到的A(λ)/A(K)值显示在3-8μm波长范围内呈现平坦，大致符合Lutz 1996关于指向银河中心的视线消光测量结果。
引用
@article{arxiv.astro-ph/0406403,
title = {The Wavelength Dependence of Interstellar Extinction from 1.25 to 8.0 microns Using GLIMPSE Data},
author = {R. Indebetouw and J. S. Mathis and B. L. Babler and M. R. Meade and C. Watson and B. A. Whitney and M. J. Wolff and M. G. Wolfire and T. M. Bania and R. A. Benjamin and D. P. Clemens and Martin Cohen and J. M. Dickey and J. M. Jackson and H. A. Kobulnicky and A. P. Marston and E. P. Mercer and J. R. Stauffer and S. R. Stolovy and E. Churchwell},
journal= {arXiv preprint arXiv:astro-ph/0406403},
year = {2008}
}
备注
20pp, 6fig, accepted version: description of the method has been revised, results are unchanged, discussion of implications slightly expanded