Zobrazeno 1 - 10
of 176
pro vyhledávání: '"Matthews, James H"'
Autor:
Parkinson, Edward J., Knigge, Christian, Dai, Lixin, Thomsen, Lars Lund, Matthews, James H., Long, Knox S.
Tidal disruption events (TDEs) can generate non-spherical, relativistic and optically thick outflows. Simulations show that the radiation we observe is reprocessed by these outflows. According to a unified model suggested by these simulations, the sp
Externí odkaz:
http://arxiv.org/abs/2408.16371
Many high-state cataclysmic variables (CVs) exhibit blue-shifted absorption features in their ultraviolet (UV) spectra -- a smoking-gun signature of outflows. However, the impact of these outflows on {\em optical} spectra remains much more uncertain.
Externí odkaz:
http://arxiv.org/abs/2406.14396
Autor:
Temple, Matthew J., Rankine, Amy L., Banerji, Manda, Hennawi, Joseph F., Hewett, Paul C., Matthews, James H., Nanni, Riccardo, Ricci, Claudio, Richards, Gordon T.
Publikováno v:
MNRAS 532, 424-437 (2024)
Understanding the links between different phases of outflows from active galactic nuclei is a key goal in extragalactic astrophysics. Here we compare [OIII] $\lambda\lambda$4960,5008 outflow signatures in quasars with and without Broad Absorption Lin
Externí odkaz:
http://arxiv.org/abs/2406.11968
Autor:
Hoof, Sebastian, Marsh, David J. E., Sisk-Reynés, Júlia, Matthews, James H., Reynolds, Christopher
Black hole (BH) superradiance can provide strong constraints on the properties of ultralight bosons (ULBs). Since most of the previous work has focused on the theoretical predictions, here we investigate the most suitable statistical framework to con
Externí odkaz:
http://arxiv.org/abs/2406.10337
Autor:
Higginbottom, Nick, Scepi, Nicolas, Knigge, Christian, Long, Knox S., Matthews, James H., Sim, Stuart A.
Disc winds are a common feature in accreting astrophysical systems on all scales. In active galactic nuclei (AGN) and accreting white dwarfs (AWDs), specifically, radiation pressure mediated by spectral lines is a promising mechanism for driving thes
Externí odkaz:
http://arxiv.org/abs/2312.06042
Autor:
Matthews, James H., Strong-Wright, Jago, Knigge, Christian, Hewett, Paul, Temple, Matthew J., Long, Knox S., Rankine, Amy L., Stepney, Matthew, Banerji, Manda, Richards, Gordon T.
Publikováno v:
MNRAS 526, pp.3967-3986 (2023)
Blueshifts - or, more accurately, blue asymmetries - in broad emission lines such as CIV $\lambda$1550 are common in luminous quasars and correlate with fundamental properties such as Eddington ratio and broad absorption line (BAL) characteristics. H
Externí odkaz:
http://arxiv.org/abs/2309.14434
Autor:
Stepney, Matthew, Banerji, Manda, Hewett, Paul C., Temple, Matthew J., Rankine, Amy L., Matthews, James H., Richards, Gordon T.
We analyse the rest-frame UV spectra of 2,531 high-redshift (3.5
Externí odkaz:
http://arxiv.org/abs/2307.02962
We present two- and three-dimensional hydrodynamic simulations of $\sim$kpc-scale AGN jets with mean jet powers in the range $1-7\times10^{45}\,$erg~s$^{-1}$, in which the jet power varies (through variation of the Lorentz factor) according to a flic
Externí odkaz:
http://arxiv.org/abs/2305.19328
We discuss our recent constraints on the coupling of Very-Light Axion-Like Particles (of masses $<$$ 10^{-12} \ \mathrm{eV}$) to electromagnetism from $Chandra$ observations of the cluster-hosted Active Galactic Nuclei (AGN) H1821+643 and NGC1275. In
Externí odkaz:
http://arxiv.org/abs/2304.08513
Testing AGN outflow and accretion models with CIV and HeII emission line demographics in z=2 quasars
Autor:
Temple, Matthew J., Matthews, James H., Hewett, Paul C., Rankine, Amy L., Richards, Gordon T., Banerji, Manda, Ferland, Gary J., Knigge, Christian, Stepney, Matthew
Publikováno v:
MNRAS 523, 646 (2023)
Using 190,000 spectra from the seventeenth data release of the Sloan Digital Sky Survey, we investigate the ultraviolet emission line properties in z=2 quasars. Specifically, we quantify how the shape of CIV 1549A and the equivalent width (EW) of HeI
Externí odkaz:
http://arxiv.org/abs/2301.02675