Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Lobban, Andrew"'
Autor:
Porquet, Delphine, Reeves, James N., Hagen, Scott, Lobban, Andrew, Braito, Valentina, Grosso, Nicolas, Marin, Frédéric
[Abridged] ESO 141-G55 is a nearby X-ray bright BLS1, which has been classified as a bare AGN due to the lack of warm absorption along its line-of-sight, providing an unhampered view into its disc-corona system. We aim to probe its disc-corona system
Externí odkaz:
http://arxiv.org/abs/2406.13623
Autor:
Porquet, Delphine, Hagen, Scott, Grosso, Nicolas, Lobban, Andrew, Reeves, James N., Braito, Valentina, Done, Chris
[Abridged] The X-ray broadband spectra of the bare AGN Mrk 110, obtained by simultaneous XMM-Newton and NuSTAR observations (Nov 2019 and April 2020), are characterised by the presence of a prominent and absorption-free smooth soft X-ray excess, mode
Externí odkaz:
http://arxiv.org/abs/2310.15002
Autor:
Reeves, James, Braito, Valentina, Porquet, Delphine, Laurenti, Marco, Lobban, Andrew, Matzeu, Gabriele
PG 1448+273 is a luminous, nearby ($z=0.0645$), narrow line Seyfert 1 galaxy, which likely accretes close to the Eddington limit. XMM-Newton observations of PG 1448+273 in 2017 revealed the presence of an ultra fast outflow, as seen through its blues
Externí odkaz:
http://arxiv.org/abs/2306.01151
We explore the accretion geometry in Arakelian 120 using intensive UV and X-ray monitoring from \textit{Swift}. The hard X-rays ($1-10$ keV) show large amplitude, fast (few-day) variability, so we expect reverberation from the disc to produce UV vari
Externí odkaz:
http://arxiv.org/abs/2207.01065
Autor:
Lobban, Andrew, King, Andrew
Accretion disc theory predicts that an AGN disc becomes self-gravitating and breaks up into stars at an outer radius $R_{\rm sg}$ ~ 12 light-days, with effectively no free parameter. We present evidence that the longer observed AGN light echoes are a
Externí odkaz:
http://arxiv.org/abs/2201.08375
Autor:
Pounds, Ken, Lobban, Andrew
Short-term variability and multiple velocity components in the powerful highly ionized wind of the archetypal UFO PG1211+143 are indicative of inner disc instabilities or short-lived accretion events. The recent detection of a high velocity inflow of
Externí odkaz:
http://arxiv.org/abs/2112.05617
Autor:
Reeves, James, Braito, Valentina, Porquet, Delphine, Lobban, Andrew, Matzeu, Gabriele, Nardini, Emanuele
New Swift monitoring observations of the variable, radio-quiet quasar, PDS 456, are presented. A bright X-ray flare was captured in September 2018, the flux increasing by a factor of 4 and with a doubling time-scale of 2 days. From the light crossing
Externí odkaz:
http://arxiv.org/abs/2010.14295
Autor:
Reeves, James, Braito, Valentina, Nardini, Emanuele, Hamann, Fred, Chartas, George, Lobban, Andrew, O'Brien, Paul, Turner, Jane
Simultaneous XMM-Newton, NuSTAR and HST observations, performed in March 2017, of the nearby ($z=0.184$) luminous quasar PDS 456 are presented. PDS 456 had a low X-ray flux compared to past observations, where the first of the two new XMM-Newton obse
Externí odkaz:
http://arxiv.org/abs/1809.07164
Blueshifted absorption lines in the X-ray spectra of AGN show that ultra-fast outflows with typical velocities $v \sim 0.1c$ are a common feature of these luminous objects. Such powerful AGN winds offer an explanation of the observed M-$\sigma$ relat
Externí odkaz:
http://arxiv.org/abs/1808.09373
Autor:
Reeves, James, Braito, Valentina, Nardini, Emanuele, Lobban, Andrew, Matzeu, Gabriele, Costa, Michele
Past X-ray observations of the nearby luminous quasar PDS 456 (at $z=0.184$) have revealed a wide angle accretion disk wind (Nardini et al. 2015), with an outflow velocity of $\sim-0.25c$. Here we unveil a new, relativistic component of the wind thro
Externí odkaz:
http://arxiv.org/abs/1801.08899