ORIGIN OF THE DIFFUSE, FAR ULTRAVIOLET EMISSION IN THE INTERARM REGIONS OF M101
ORIGIN OF THE DIFFUSE, FAR ULTRAVIOLET EMISSION IN THE INTERARM REGIONS OF M101
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DOI：
10.1088/0004-637x/808/1/76
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
A. Crocker;R. Chandar;D. Calzetti;B. Holwerda;C. Leitherer;C. Popescu;R. Tuffs
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文献类型：
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作者：
A. Crocker;R. Chandar;D. Calzetti;B. Holwerda;C. Leitherer;C. Popescu;R. Tuffs
我们目前的图像从哈勃太空望远镜上的太阳盲通道，解决数百个远紫外线（FUV）发射恒星在两个101 kpc 2的大设计螺旋M101的臂间区域。这些恒星的光度函数与预测的分布从简单的星星形成的历史进行了比较，最好的再现时，星星形成率最近下降（过去10-50万年）。这种模式与恒星在旋臂内形成，然后流入旋臂间的区域是一致的。我们在减去所有检测到的恒星，星团和背景星系后测量漫射FUV表面亮度。一个剩余的通量被发现这两个地区，这可以解释为低于我们的检测限和散射FUV光的恒星的混合。对于紧邻螺旋臂的区域，所需的散射光的量要大得多，螺旋臂是FUV光子的明亮来源。
We present images from the Solar Blind Channel on the Hubble Space Telescope that resolve hundreds of far-ultraviolet (FUV) emitting stars in two ∼1 kpc2 interarm regions of the grand-design spiral M101. The luminosity functions of these stars are compared with predicted distributions from simple star formation histories, and are best reproduced when the star formation rate has recently declined (past 10–50 Myr). This pattern is consistent with stars forming within spiral arms and then streaming into the interarm regions. We measure the diffuse FUV surface brightness after subtracting all of the detected stars, clusters, and background galaxies. A residual flux is found for both regions, which can be explained by a mix of stars below our detection limit and scattered FUV light. The amount of scattered light required is much larger for the region immediately adjacent to a spiral arm, a bright source of FUV photons.