期刊
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
卷 154, 期 1, 页码 215-221出版社
UNIV CHICAGO PRESS
DOI: 10.1086/422714
关键词
dust, extinction; galaxies : individual (M81); galaxies : ISM; galaxies : spiral; infrared : galaxies
We present Multiband Imaging Photometer for Spitzer (MIPS) observations of M81 at 24, 70, and 160 mum. The grand design nature of M81 is clearly seen, showing two well-resolved spiral arms containing numerous bright star-forming regions. The MIPS images reveal a significant amount of cold dust associated with the spiral arms. We investigate the variation of the ultraviolet (UV), Halpha, and infrared (IR) luminosities and star formation rate (SFR) indicators across the face of M81 using the MIPS images and archival UV and Halpha images. For regions in M81, we find that UV and Halpha SFRs (uncorrected for dust attenuation) are always lower than the IR SFR. The cause of this behavior is dust attenuation and/or using SFR calibrations appropriate for entire galaxies, not regions in galaxies. The characteristics of the dust attenuation for the regions indicate the dust grains and/or geometry are different from those in starburst galaxies. The behavior of the infrared-radio correlation in M81 is seen to vary from the global average, with variations correlated with the morphology of M81.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据