AGN counts at 15$\mu{\rm m}$

Infrared Number Counts of AGN in the GOODS Fields

Using the known numbers and evolution of unobscured AGN, and assuming that there is a large number of corresponding obscured AGN — as expected if AGN unification is correct — we predict the infrared number counts of AGN. These agree well with the observed GOODS Spitzer data at 3.6, 8 and 24 μm, provided that the dust content of the obscuring torus is ∼ 2x less than assumed. This strongly suppor...

Typical AGN at intermediate redshifts

We study the host galaxies and black holes of typical X-ray selected AGN at intermediate redshifts (z ∼ 0.5− 1.4). The AGN are selected such that their spectral energy distributions are dominated by stellar emission, i.e., they show a prominent 1.6 μm bump thus minimizing the AGN emission contamination. This AGN population comprises approximately 50% of the X-ray selected AGN at these redshifts...

What’s at the Antenna Counts

The Agn–starburst Connection, Galactic Superwinds, and M Bh − Σ

Recent observations of young galaxies at redshifts z ∼ 3 have revealed simultaneous AGN and starburst activity, as well as galaxy–wide superwinds. I show that there is probably a close connection between these phenomena by extending an earlier treatment of the MBH−σ relation (King, 2003). As the black hole grows, an outflow drives a shell into the surrounding gas. This stalls after a dynamical ...

Polarization Properties of AGN at High Frequencies

I discuss variability of polarization in the core region of parsec scale radio jets and connections between 7 mm polarization in the VLBI core and polarization at shorter wavelengths from the whole source for a sample of AGN with highly relativistic jets known as blazars. The sources show pronounced diversity in polarization behavior that is not clearly understood. I discuss possible reasons fo...