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>HST Ultraviolet Spectroscopy of NGC 1741- a Nearby Template for Distant Energetic Starbursts
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HST Ultraviolet Spectroscopy of NGC 1741- a Nearby Template for Distant Energetic Starbursts
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机译:NGC 1741的HsT紫外光谱 - 附近的远程模板 充满活力的starbursts
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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.
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