Near-IR through UV SEDs and Dust Reddening in SDSS Quasars

Details Near-IR through UV SEDs and Dust Reddening in SDSS Quasars Near-IR through UV SEDs and Dust Reddening in SDSS Quasars

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543318k&link_type=abstract

American Astronomical Society, AAS Meeting #215, #433.18; Bulletin of the American Astronomical Society, Vol. 42, p.373

Astronomy and Astrophysics

Astronomy

Scientific paper

We have constructed spectral energy distributions (SEDs) for quasars from the Sloan Digital Sky Survey's (SDSS) 7th data release. To extend the SEDs beyond the optical, we cross matched the SDSS catalogs with 2MASS and GALEX. Cross-matching to the 2MASS 5-sigma catalogs results in 13,938 matches between SDSS and the 2MASS All-Sky point source catalog. However, since accurate positions are already known for all of the SDSS quasars, it was possible to extract photometric data down to a 2-sigma level. This process yielded an additional 39,646 2MASS measurements for our SDSS quasar sample. With the expanded SEDs, the form of extragalactic reddening for the quasars with z<2 has been examined. Our fitting algorithm explores whether each quasar SED is well-fit by a power-law or if there is evidence of curvature from dust reddening. With a large data set, we are able to constrain the dominant form of the reddening in the mean for SDSS quasars.

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