The Young Stellar Content of Post-Starburst Quasars

Details The Young Stellar Content of Post-Starburst Quasars The Young Stellar Content of Post-Starburst Quasars

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348410s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #484.10; Bulletin of the American Astronomical Society, Vol. 41, p.454

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Observations have revealed a class of objects that simultaneously exhibit evidence for a quasar and a massive, luminous, moderately-aged starburst ( 10^10 solar masses and 100 Myr). These post-starburst quasars (PSQs) may be an important link in the evolutionary history of galaxies, providing insight into the transformation from young, blue, early-type star-forming galaxies to older, red, late-type quiescent galaxies. For our sample, we have spectroscopically-selected 600 PSQs from SDSS, with archival GALEX data available for approximately 2/3 of these objects. We use GALEX photometry, in addition to other data, to fully characterize their SEDS and explore their stellar content, including the existence of young stars (as young as several Myr old) formed after the starburst. Further, we investigate the possible presence of dust obscuration and quasar outflows as might be evidenced by depressed flux in the UV regime. We separate host galaxy and quasar flux contributions using host flux fractions in the optical band. After measuring NUV and FUV fluxes, we compare them with the expected flux contribution from a quasar composite extrapolated from the optical contribution. We will present these measurements as well as color comparisons between the PSQs, quasars, and post-starburst galaxies in order to understand the differences in their young stellar populations.
We acknowledge support from the US National Science Foundation through grant AST 05-07781, from NASA through grants NNG05GE84G and NNX08AK67G, and by the Summer Undergraduate Research Assistantship Program a the Wyoming Infrared Observatory.

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