IRS Observations of IR-Selected Obscured QSOs in Deep X-ray Fields

Details IRS Observations of IR-Selected Obscured QSOs in Deep X-ray Fields IRS Observations of IR-Selected Obscured QSOs in Deep X-ray Fields

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30419r&link_type=abstract

Spitzer Proposal ID #30419

Computer Science

Scientific paper

Because of their optically-faint nature, obscured AGN have historically been difficult to detect. The dust that obscures the optical, UV, and soft X-ray emission, however, re-radiates in the mid-infrared, making Spitzer the ideal tool for studying these elusive objects. We propose low-resolution Spitzer IRS spectroscopy of 10 optically faint, mid-infrared bright sources identified in the Extended-Chandra Deep Field-South (E-CDF-S) and Extended Groth Strip (EGS). The IRS spectra of the majority of such sources observed thus far (~75%) are dominated by silicate absorption features or are featureless, and as such, are best-fit by obscured AGN templates. Infrared spectra by themselves, however, do not provide an unambiguous distinction between obscured AGN and obscured starburst activity. The most direct way to distinguish between these two scenarios is with deep X-ray observations, observations not available in the fields in which these sources have previously been selected. Deep (>200 ks) Chandra X-ray observations are available in both the E-CDF-S and EGS. In combination with the X-ray data, we will use the IRS spectral properties (redshifts, silicate/PAH strengths) to characterize the quasar/AGN content of these sources. In addition, this study will allow us to compare properties of infrared and X-ray selected obscured AGN, and place stringent constraints on the space density of obscured quasar activity.

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