Spectral energy distributions of quasars selected in the mid-infrared
Abstract
We present preliminary results on fitting of SEDs to 142 z < 1 quasars selected in the mid-infrared. Our quasar selection finds objects ranging in extinction from highly obscured, type-2 quasars, through more lightly reddened type-1 quasars and normal type-1s. We find a weak tendency for the objects with the highest far-infrared emission to be obscured quasars, but no bulk systematic offset between the far-infrared properties of dusty and normal quasars as might be expected in the most naive evolutionary schemes. The hosts of the type-2 quasars have stellar masses comparable to those of radio galaxies at similar redshifts. Many of the type-1s, and possibly a one of the type-2s require a very hot dust component in addition to the normal torus emission.
- Publication:
-
The Spectral Energy Distribution of Galaxies - SED 2011
- Pub Date:
- August 2012
- DOI:
- 10.1017/S1743921312009106
- arXiv:
- arXiv:1203.4521
- Bibcode:
- 2012IAUS..284..224L
- Keywords:
-
- galaxies:active;
- quasars: general;
- infrared: galaxies;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 4 pages, 2 figures, to appear in the proceedings of The Spectral Energy Distribution of Galaxies, Preston, September 2011, eds R.J. Tuffs &