Discovery of Candidate H$_2$O Disk Masers in AGN and Estimations of Centripetal Accelerations (2009)
Greenhill, Lincoln J., Kondratko, Paul T., Moran, James M., Tilak, Avanti
Based on spectroscopic signatures, about one-third of known H$_2$O maser sources in active galactic nuclei (AGN) are believed to arise in highly inclined accretion disks around central engines. These...
Prevalence of High X-ray Obscuring Columns among AGN that Host H$_2$O Masers (2008)
Greenhill, Lincoln J., Tilak, Avanti, Madejski, Grzegorz
Of 104 AGN known to exhibit H$_2$O maser emission, X-ray data that enable estimation of column densities, or lower limits, are available for 42. Contributing to this, we report analysis of new and...
A Deep 0.3-10 keV Spectrum of the H$_{2}$O Maser Galaxy IC 2560 (2008)
Tilak, Avanti, Greenhill, Lincoln, Done, Chris, Madejski, Grzegorz
We present a new XMM-Newton spectrum of the Seyfert 2 nucleus of IC 2560, which hosts H$_{2}$O maser emission from an inclined Keplerian accretion disk. The X-ray spectrum shows soft excess due to...
Tilak, Avanti, O'Dea, Christopher, Tadhunter, Clive, Willis, Karen, Morganti, Raffaella, Baum, Stefi, ...
Also archived in: arXiv: astro-ph/0507652 v1 27 Jul 2005
Tilak, Avanti, O'Dea, Christopher P., Tadhunter, Clive, Willis, Karen, Morganti, Rafaella, Baum, Stefi A., ...
We present the results of HST/WFPC2 medium and narrow band imaging and VLA and MERLIN2 radio imaging of three powerful radio galaxies: 3C 171, 3C 277.3, and PKS 2250-41. We obtained images of the...