455 citations · 1.2k across the 23 of their papers we have counts for
8 papers · 1 filter
Faint radio-loud quasars: clues to their evolution
M. Cirasuolo, M. Magliocchetti, A. Celotti
The quasar sample selected by cross-correlating the FIRST and the 2dF Quasar Redshift Surveys allows us to explore, for the first time, the faint end of the radio and optical lumin…
Hydrodynamics of Internal Shocks in Relativistic Outflows
M. Kino, A. Mizuta, A. Celotti +1
We study the hydrodynamical effects of two colliding shells, adopted to model internal shocks in various relativistic outflows such as gamma-ray bursts and blazars. We find that th…
XMM observations of the high-redshift quasar RXJ1028.6-0844 at z=4.276: soft X-ray spectral flattening
W. Yuan, A. C. Fabian, A. Celotti +2
We present results from a new XMM-Newton observation of the high-redshift quasar RXJ1028.6-0844 at a redshift of 4.276. The soft X-ray spectral flattening, as reported by a study w…
Disk Outflows and the Accretion Rate Gap
Mitchell C. Begelman, Annalisa Celotti
We argue that the observed `accretion rate gap' - between black holes in radio-loud active galactic nuclei (AGN) accreting at close to the Eddington limit and those accreting at co…
XMM-Newton observations of GB B1428+4217: confirmation of intrinsic soft X-ray absorption
M. A. Worsley, A. C. Fabian, A. Celotti +1
We report the results of XMM-Newton observations of the X-ray bright, radio-loud blazar GB B1428+4217 at a redshift of z=4.72. We confirm the presence of soft X-ray spectral flatte…
A Transition in the Accretion Properties of Radio-Loud Active Nuclei
Danilo Marchesini, Annalisa Celotti, Laura Ferrarese
We present evidence for the presence of a transition in the accretion properties of radio-loud sources. For a sample of radio galaxies and radio-loud quasars, selected based on the…