Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20914909y&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #149.09; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We cross-correlated the Schneider et al. SDSS Catalog with the XMM-Newton archival database to obtain a large sample of quasars. We then applied color and redshift selections (B-R > 1.1 and 1 ≤ z ≤ 2) to restrict the sample to a manageable size of 18 of the reddest quasars. Seventeen of the 18 are detected to 2σ by XMM. The non-detection is a broad absorption-line quasar and is clearly reddened in the optical. Two of the X-ray detected sample have very flat X-ray spectra (Γ < 1.0) and are significantly X-ray weak compared to the optical (αox < 1.8) while their signal-to-noise is too low to fit NH, we assume these are obscured due to their flat spectra. An additional three quasars have somewhat flat spectral indices (1.0 < Γ < 1.5) but normal αox values (αox -1.5).
However, no significant absorption was detected in the X-rays of the higher signal-to-noise spectra and the X-ray spectral indices and αox values are within normal ranges for the rest of the sample. We will analyze the optical spectra to conclude whether dust absorption or an intrinsic continuum difference is the cause of reddening for our sample.
Elvis Martin
Risaliti Guido
Young Monica
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