Physics – Optics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.2010a&link_type=abstract
American Astronomical Society, AAS Meeting #212, #20.10; Bulletin of the American Astronomical Society, Vol. 40, p.533
Physics
Optics
Scientific paper
We present stellar populations analysis of 8 AGN hosts at z 1 and derive stellar age trends that compare to local AGN host samples. We utilize laser guide star adaptive optics imaging in K-band, taken at the Keck Observatory, of hosts in the Great Observatories Origins Deep Survey (GOODS) South. Combination of these data with imaging in B, V, i, z from the HST Advanced Camera for Surveys (ACS) gives multi-color photometry with comparable spatial resolution of better than 100 mas in all bands. The AGN nature of these hosts is implied from their large X-ray luminosities (log L > 42 in ergs/s, 2-10 keV) as measured by Chandra. We fit Bruzual & Charlot (2003) stellar populations models to the 5-band photometry. Our use of near-IR fluxes in the fitting process gives tighter constraints on the dust extinction. The strongest conclusion is that the presence of distributed younger stellar populations (age less than 100 Myr) is correlated with the [OIII] line luminosity or X-ray (2-10 keV) luminosity. This finding is consistent with similar studies at lower redshift. However, we also find that strong Type II AGN hosts at this redshift are more likely to have some disk component or be irregulars than all Type I sources, which tend to be of earlier type. The mid-IR SEDs of the strong Type II AGN indicates that they are excited to LIRG status via galactic starbursting, while the strong Type I AGN are excited to LIRG status via hot dust surrounding the central engine. This suggests that the obscured nature of Type II AGN at this redshift is connected with global starbursting and that they may be extincted by kpc-scale dusty features that are byproducts of this starbursting. This study is funded by the Bachmann family and the NSF.
Ammons Mark
Koo David
Max Claire
Melbourne Jason
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