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UV Spectral Diagnostics of Galaxy EvolutionNew instrumentation now enable deep spectral surveys of galaxies at younger ages. At a redshift, z=1, all galaxies are less than 6 Gyr old and hence, have not yet formed horizontal-branch stars. Also, at z=1, the restframe-UV comes into view, and with it, a new set of spectral diagnostics. UV spectral features are especially important because most of the UV flux comes from stars at the main-sequence turnoff (MSTO). Hence, UV spectral diagnostics enable the most recent star formation episode of high-redshift galaxies to be estimated directly from MSTO stars. In preparation for these high-redshift spectral surveys, we are developing UV spectral templates for stellar populations younger than 6 Gyr using UV-optical spectra of stars observed by HST/STIS. We are also starting to supplement these observations with theoretical spectral grids of stars of various metallicities. In this paper, we present a progress report on UV spectral templates and spectral diagnostics.
Document ID
20040171569
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Heap, Sara R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2003
Subject Category
Astronomy
Meeting Information
Meeting: Workshop on Multiwavelength Mapping of Galaxy Formation and Evolution
Location: Venice
Country: Italy
Start Date: October 13, 2003
End Date: October 16, 2003
Sponsors: European Southern Observatory
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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