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UV Spectral Templates for High-Redshift GalaxiesNew instrumentation such as DEIMOS on Keck-II now enable deep spectral surveys, and thereby samples 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 ages of z = 1 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 planning to supplement these observations with theoretical spectral grids of stars of various metallicities. In this paper, we present a progress report on the observation-based spectral templates and spectral diagnostics.
Document ID
20030053381
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Heap, Sara
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lindler, Don
(Sigma, Inc. United States)
Lanz, Thierry
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Astronomy
Meeting Information
Meeting: 202nd Meeting of the American Astronomical Society
Location: Nashville, TN
Country: United States
Start Date: May 25, 2003
End Date: May 29, 2003
Sponsors: American Astronomical Society
Distribution Limits
Public
Copyright
Other

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