UV Spectral Templates for High-Redshift Galaxies

Details UV Spectral Templates for High-Redshift Galaxies UV Spectral Templates for High-Redshift Galaxies

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.1107h&link_type=abstract

American Astronomical Society Meeting 202, #11.07; Bulletin of the American Astronomical Society, Vol. 35, p.715

Astronomy and Astrophysics

Astronomy

Scientific paper

New 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.

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