Computer Science
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40143l&link_type=abstract
Spitzer Proposal ID #40143
Computer Science
Scientific paper
The black hole mass - bulge mass correlation in seen local galaxies tells us that quasar black holes and their host galaxies grow in concert. Yet only a minority of normal quasar hosts show evidence for star formation activity at a high enough rate to keep galaxy and black hole masses in step. We used HST/ACS to target a sample of dust-reddened type-1 quasars selected using FIRST and 2MASS, and found a very high fraction (85%) of merging and interacting host galaxies. This suggests that the starforming stages of quasar hosts may be correlated with dust reddening, which explains why so few starforming quasar hosts are seen in samples of X-ray or optically-selected quasars. To prove that our hosts are forming stars at high rates (~100 solar masses/year), however, we need infrared spectroscopy and photometry. IRS spectra and photometry will allow us to estimate star formation rates from the PAH and far-infrared excess to compare with those estimated from optical diagnostics, and thus estimate the amount of obscured star formation in the hosts. Spectra will also allow us to obtain an estimate of the obscuration to the quasar via the silicate feature.
Becker Robert
Canalizo Gabriela
Glikman Eilat
Gregg Michael
Lacy Mark
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