INTRINSICALLY RED SOURCES OBSERVED BY SPITZER IN THE GALACTIC MIDPLANE
INTRINSICALLY RED SOURCES OBSERVED BY SPITZER IN THE GALACTIC MIDPLANE
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DOI：
10.1088/0004-6256/136/6/2413
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发表时间：
2008-09
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影响因子：
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通讯作者：
T. Robitaille;M. Meade;B. Babler;B. Whitney;K. Johnston;R. Indebetouw;M. Cohen;M. Povich;M. Sewiło;R. Benjamin;E. Churchwell
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作者：
T. Robitaille;M. Meade;B. Babler;B. Whitney;K. Johnston;R. Indebetouw;M. Cohen;M. Povich;M. Sewiło;R. Benjamin;E. Churchwell
我们对银河中平面内的 18,949 个点源进行了高度可靠的通量限制普查，这些点源具有固有的红色中红外颜色。这些源选自斯皮策太空望远镜银河遗产红外中面巡天非凡 (GLIMPSE) I 和 II 对银河中面 274 度的巡天，主要由高质量和中等质量的年轻恒星天体 (YSO) 和渐近巨分支 (AGB) 恒星组成。选择标准经过精心选择，以尽量减少位置相关的敏感性、饱和度和混乱的影响。介绍了天空中光源的分布及其在红外阵列相机和 Spitzer 24 μm 色彩幅度和色彩空间的多波段图像光度计中的位置。使用这个大样本，我们发现 YSO 和 AGB 恒星大部分可以通过简单的颜色-星等选择标准分为大约 50%–70% 的 YSO 和 30%–50% 的 AGB 恒星。行星状星云和背景星系总共最多占所有红色源的 2%–3%。 GLIMPSE II 区域中的 1004 个红色源，大部分是具有高质量损失率的 AGB 恒星，在 4.5 和/或 8.0 μm 处显示出显着的（⩾0.3 星等）变化。可能有超过 11,000 颗可能的 YSO 和超过 7000 颗可能的 AGB 恒星，这是迄今为止对银河系中 AGB 恒星和高中质量 YSO 进行的最大规模的统一普查。
We present a highly reliable flux-limited census of 18,949 point sources in the Galactic midplane that have intrinsically red mid-infrared colors. These sources were selected from the Spitzer Space Telescope Galactic Legacy Infrared Midplane Survey Extraordinaire (GLIMPSE) I and II surveys of 274 deg2 of the Galactic midplane, and consist mostly of high- and intermediate-mass young stellar objects (YSOs) and asymptotic giant branch (AGB) stars. The selection criteria were carefully chosen to minimize the effects of position-dependent sensitivity, saturation, and confusion. The distribution of sources on the sky and their location in the Infrared Array Camera and the Multiband Image Photometer for Spitzer 24 μm color–magnitude and color–color space are presented. Using this large sample, we find that YSOs and AGB stars can be mostly separated by simple color–magnitude selection criteria into approximately 50%–70% of YSOs and 30%–50% of AGB stars. Planetary nebulae and background galaxies together represent at most 2%–3% of all the red sources. 1004 red sources in the GLIMPSE II region, mostly AGB stars with high mass-loss rates, show significant (⩾0.3 mag) variability at 4.5 and/or 8.0 μm. With over 11,000 likely YSOs and over 7000 likely AGB stars, this is to date the largest uniform census of AGB stars and high- and intermediate-mass YSOs in the Milky Way Galaxy.