Adrenal ganglioneuroma (AGN) is an extremely rare and benign entity comprising Schwann cells and ganglion cells. If the lesion approaches to 6 cm, laparoscopic resection is considered as relative contraindication. Now we present a giant adrenal AGN in a 25-year-old male patient. After abdominal computed tomography (CT) scanning, the patient underwent an exploratory laparotomy with right adrenal...

Long-time-scale X-ray and optical variability is a key characteristic of AGN. Here, we summarise our current understanding of the X-ray and optical continuum variability of radioquiet AGN and the relation between the two bands. We demonstrate the strong connection between the X-ray variability properties of AGN and the variability of stellar-mass black hole candidates on much shorter time-scale...

We study the effect of active galactic nuclei (AGN) heating on the chemodynamical evolution of elliptical galaxies and their X-ray and optical properties using highresolution Λ-dominated cold dark matter cosmological simulations. Our model considers an AGN as being “active” when a convergent gas inflow condition exists within a galaxy’s nucleus; otherwise, the AGN is assumed to remain dormant. ...

We have mapped the AGN luminosity function and its evolution between z = 1 and z = 5 down to apparent magnitudes of R < 24. Within the GEMS project we have analysed HST-ACS images of many AGN in the Extended Chandra Deep Field South, enabling us to assess the evolution of AGN host galaxy properties with cosmic time.

We discuss spectral principal component analysis (SPCA) and show examples of its application in analyzing AGN spectra in both small and large samples. It can be used to identify peculiar spectra and classify AGN spectra. Its application to correlation studies of AGN spectral properties and spectral measurements for large samples is promising.

In a series of papers based on the FIRST and Sloan Digital Sky Surveys (SDSS), we investigate the local population of star-forming galaxies and Active Galactic Nuclei (AGN) in order to clarify the link between these two types of activity, to explore the dependence of their features on the properties of their host galaxies, and to examine the role of the environment in triggering activity. In th...

We describe improved modelling of the emission by dust in a toroidal–like structure heated by a central illuminating source within Active Galactic Nuclei (AGN). We chose a simple but realistic torus geometry, a flared disc, and a dust grain distribution function including a full range of grain sizes. The optical depth within the torus is computed in detail taking into account the different subl...

We present a statistical analysis of 248 luminous infrared galaxies (LIRGs) which comprise the Great Observatories All-sky LIRG Survey (GOALS) observed with the Infrared Spectrograph (IRS) on-board Spitzer in the rest-frame wavelength range between 5 and 38 μm. The GOALS sample enables a direct measurement of the relative contributions of star-formation and active galactic nuclei (AGN) to the t...

We examine the power source of 41 local Ultraluminous Infrared Galaxies (ULIRGs) using archival infrared (IR) and optical photometry. We fit the observed Spectral Energy Distributions (SEDs) with starburst and AGN components; each component being drawn from a family of templates. We find all of the sample require a starburst, whereas only half require an AGN. In 90% of the sample the starburst ...