We present broad band surface photometry of the radio galaxy 3C270 (NGC 4261). We find a distinct dust lane in the V −R image of the galaxy, and determine its orientation and size. We use the major axis profile of the galaxy to estimate the optical depth of the dust lane, and discuss the significance of the lane to the shape of the galaxy. Subject headings: Galaxies: active; Galaxies: radio; Ga...

We describe new optical images and spectra of POX 52, a dwarf galaxy with an active nucleus that was originally detected in the POX objective-prism survey. While POX 52 was originally thought to be a Seyfert 2 galaxy, the new data reveal an emission-line spectrum very similar to that of the dwarf Seyfert 1 galaxy NGC 4395, with broad components to the permitted line profiles, and we classify PO...

We present a detailed study of SMM02399−0136, an ultraluminous, active galaxy selected from a sub-mm survey of the distant Universe. This object is the brightest source in the fields of four rich, lensing clusters, with a total area of ∼20 arcmin, that we have mapped with a sensitivity better than 2mJy beam at 850μm. We identify a compact optical counterpart with an apparent magnitude of B ∼ 23...

Self-consistent N-body simulations have been performed in order to study the effects of a central active galactic nucleus (AGN) on the dark matter profile of a typical giant elliptical galaxy. In our analysis, we assume that periodic bipolar outbursts from a central AGN can induce harmonic oscillatory motions on both sides of the gas core. Using realistic AGN properties, we find that the motion...

We analyse the relation between AGN host properties and large scale environment for a representative red and blue AGN host galaxy sample selected from the DR4 SDSS. A comparison is made with two carefully constructed control samples of non-active galaxies, covering the same redshift range and color baseline. The cross-correlation functions show that the density distribution of neighbours is alm...