We use a large, heterogeneous sample of local active galactic nuclei (AGNs) that includes Seyfert 1 galaxies, Seyfert 2 galaxies, and Palomar-Green quasars to investigate for the first time the relation between black hole mass ( ) and mid-infrared nuclear emission. We find a clear relation between and 10 mm nuclear luminosity M M BH BH for these local AGNs. There are no significant differences ...

Sub-arcsecond IRAM Plateau de Bure mm-interferometric observations of the CO (2-1) line emission in the Seyfert 1 NGC 3227 and the Seyfert 2 NGC 1068 have revealed complex kinematic systems in the inner 100 pc to 300 pc that are not consistent with pure circular motion in the host galaxies. Modeling of these kinematic systems with elliptical orbits in the plane of the host galaxy (representing ...

We present the results of ROSAT All–Sky Survey observations of Seyfert and IR–luminous galaxies from the Extended 12 μm Galaxy Sample and the optically–selected CfA Sample. Detections are available for 80% (44/55) of the Seyfert 1s and 34% (23/67) of the Seyfert 2s in the 12 μm sample, and for 76% (26/34) of the Seyfert 1s and 38% (6/16) of the Seyfert 2s in the CfA sample. Roughly half of the ...

Infrared bright galactic nuclei may be powered by accretion of matter onto a black hole, a burst of new star formation, or both of these processes. To gain insight into such processes we have used integral field spectroscopy to observe a sample of galaxies with identified AGN or nuclear starbursts. We confirm the presence of a starburst in the nuclear regions of the galaxies IC 3639, MRK 477, N...

Using the BeppoSAX observatory, we have observed a nearby LINER/Seyfert 2 galaxy, NGC 3079, which is known as an outflow galaxy and a bright H2O-maser source. Using the PDS detector, we have revealed that the NGC 3079 nucleus suffers from a Compton-thick absorption, with a hydrogen column density ∼ 10 cm. After corrected the absorption, the 2–10 keV luminosity becomes 10 erg s at a distance of ...

Near-infrared JHK ′ imaging photometry was obtained of 331 AGNs consisting mainly of Seyfert 1 AGNs and quasars (QSOs). This sample was selected to cover a range of radio emission strength, redshift from z = 0 to 1, and absolute B-magnitude from MB = −29 mag to −18 mag. Among low-z AGNs with z < 0.3, Seyfert 1− 1.5 AGNs are distributed over a region from a location typical of “galaxies” to a lo...

If AGN are powered by the accretion of matter onto massive black holes, how does the gas in the host galaxy lose the required angular momentum to approach the black hole? Gas easily transfers angular momentum to stars in strong bars, making them likely candidates. Although ground-based searches for bars in active galaxies using both optical and near infrared surface brightness have not found an...

Averaged spectral energy distributions (SEDs) of active and starburst galaxies from the 12μm sample in the Local Universe and quasars, from an optically selected sample at a mean redshift 〈z〉=0.7 are built from optical, near-IR and far-IR (IRAS and ISO) photometric observations. These SEDs are then used to predict at various redshifts the number of Seyfert type 1 and type 2, starburst, normal g...