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HST Ultraviolet Spectroscopy of NGC 1741- a Nearby Template for Distant Energetic Starbursts

机译:NGC 1741的HsT紫外光谱 - 附近的远程模板  充满活力的starbursts

摘要

We have obtained a Hubble Space Telescope ultraviolet image and spectrum ofthe nearby Wolf-Rayet galaxy NGC 1741. The spatial morphology from the FaintObject Camera image is dominated by two main starburst centers, each beingabout 100 times as luminous as 30 Doradus. Both starburst centers are composedof several intense knots of recent star formation. A Goddard High ResolutionSpectrograph spectrum of a portion of the southern starburst center isconsistent with a population of young stars following a Salpeter IMF for massesabove approx 15 Msun (lower mass stars may also be present), and extending upto approx 100 Msun; about 10^4 O-type stars are inferred from the UVluminosity. Numerous strong interstellar lines are detected. Although notresolved, their strength suggests that they are formed in individual bubblesand shells with velocities up to a few hundred kms. The red wing of theLyman-alpha absorption profile indicates the presence of several neutralhydrogen components, one in our own Galaxy and the others at or close to thedistance of NGC 1741. Overall, the stellar and interstellar line spectrum, aswell as the continuum shape of NGC 1741, strongly resembles star-forminggalaxies recently discovered at high redshift.
机译:我们获得了哈勃太空望远镜的紫外图像和附近的Wolf-Rayet星系NGC 1741的光谱。来自FaintObject Camera图像的空间形态主要由两个主要的星爆中心控制,每个中心的发光强度约为30 Doradus的100倍。两个星爆中心都由最近恒星形成的几个强烈结组成。南部星爆中心的戈达德高分辨率光谱图谱与萨尔珀特IMF的质量大约在15 Msun以上的年轻恒星数量一致(也可能存在质量较低的恒星),并延伸到大约100 Msun;从紫外光度可以推断出约10 ^ 4个O型恒星。可以检测到许多强的星际线。尽管尚未解决,但它们的强度表明它们是由速度高达几百公里的单个气泡和壳形成的。 Lyman-α吸收曲线的红色翅膀表示存在几种中性氢成分,一种存在于我们自己的星系中,另一种处于NGC 1741或接近NGC的距离处。总的来说,恒星和星际线谱以及NGC的连续体形状1741年,非常类似于最近在高红移中发现的恒星形成星系。

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