Hubble Space Telescope Ultraviolet Spectroscopy of NGC 1741: A Nearby Template for Distant Energetic Starbursts
Hubble Space Telescope Ultraviolet Spectroscopy of NGC 1741: A Nearby Template for Distant Energetic Starbursts
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NGC 1741 的哈勃太空望远镜紫外光谱：遥远高能星暴的附近模板
DOI：
10.1086/310005
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
W. Vacca
中科院分区：
文献类型：
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作者：
Peter S. Conti;Claus Leitherer;W. Vacca
我们已经获得了哈勃太空望远镜的沃尔夫-拉叶星系NGC 1741附近的紫外图像和光谱。暗天体照相机图像的空间形态主要由两个主要的星暴中心控制，每个中心的亮度大约是剑鱼座30的100倍。这两个恒星爆发中心都是由几个最近形成的星星的密集节点组成的。戈达德高解析度摄谱仪观测到的南部星暴中心部分的光谱与遵循Salpeter IMF的年轻恒星群相一致，这些恒星的质量在~15 M以上（也可能存在较低质量的恒星），并延伸到~100 M;从紫外光度推断出大约104颗O型恒星。探测到许多强的星际线。虽然没有解决，他们的力量表明，他们是在个别气泡和壳形成的速度高达几百公里秒-1。Lyα吸收剖面的红翼表明存在几个中性氢成分，一个在我们自己的银河系中，另一个在NGC 1741的距离或附近。总的来说，NGC 1741的恒星和星际线光谱，以及连续体的形状，非常类似于最近在高红移发现的恒星形成星系。
We have obtained a Hubble Space Telescope ultraviolet image and spectrum of the nearby Wolf-Rayet galaxy NGC 1741. The spatial morphology from the Faint Object Camera image is dominated by two main starburst centers, each being about 100 times as luminous as 30 Doradus. Both starburst centers are composed of several intense knots of recent star formation. A Goddard High Resolution Spectrograph spectrum of a portion of the southern starburst center is consistent with a population of young stars following a Salpeter IMF for masses above ~15 M☉ (lower mass stars may also be present) and extending up to ~100 M☉; about 104 O-type stars are inferred from the UV luminosity. Numerous strong interstellar lines are detected. Although not resolved, their strength suggests that they are formed in individual bubbles and shells with velocities up to a few hundred km s-1. The red wing of the Lyα absorption profile indicates the presence of several neutral hydrogen components, one in our own Galaxy and the others at or close to the distance of NGC 1741. Overall, the stellar and interstellar line spectrum, as well as the continuum shape of NGC 1741, strongly resembles star-forming galaxies recently discovered at high redshift.