... I am actively investigating the properties of QSO host galaxies, in particular by means of imaging stacking, in order to derive the fundamental scaling relations between supermassive black holes and galaxy properties on large samples of several thousands ...
... The clustering length of local X-ray selected AGN was found to be similar to that of local galaxies, supporting the idea that active nuclei are unbiased with respect to normal galaxies. ...
... This type of events is not observed in elliptical galaxies, but generally in the spiral arms of galaxies and in HII regions, where star formation is active. ...
... When seen faceon the large number of clumps in the ring position at tenuates a lot of the radiation coming from the half of the galaxy below the plane, acting almost as a screen. ...
... Amidst all of this, NGC 1808 is undergoing so much star formation it has been deemed a starburst galaxy . ... In the above color-enhanced photograph , regions of active star formation and shown by their blue glow. ...
... When a BH is actively accreting gas, i.e. when it is in the Active Galactic Nucleus (AGN) phase, the energy released can have a significant impact on the larger-scale surrounding gas of the host galaxy. ...
... 14 June 2011: Stefano Zibetti, "Resolved optical-infrared SEDs of galaxies: universal relations and their break-down on local ... 31 May 2011: Hagai Netzer, "The earliest growth of the most massive black holes: the active z=4.8 universe" . ...
... The formation and evolution of Active Galactic Nuclei (AGN), attributed to accreting massive black holes (BHs), are closely related to the formation and evolution of the galaxies which host them. ...
... at higher stellar masses Virgo SFDs galaxies: Poor correlation between Md/M* and ... SF Active dwarfs: No clear correlation between Md/M* and stellar mass. ... deficiency The most HI-deficient Virgo galaxies at both High ( ) and low ( ) M* have ...
... Cracco Dipartimento di Astronomia UniversitЮ di Padova Morphology and photometry of isolated Seyfert galaxies An important, unresolved, problem about active galactic nuclei (AGN) is the determination of the mechanism responsible for nuclear activity ...