Zobrazeno 1 - 10
of 58
pro vyhledávání: '"Rankine, Amy"'
Autor:
Guetzoyan, Paloma, Aird, James, Georgakakis, Antonis, Coil, Alison L., Barlow-Hall, Cassandra, Hickox, Ryan C., Rankine, Amy L., Terrazas, Bryan A.
Supermassive Black Holes (BHs) are known to efficiently grow through gas accretion, but even sustained and intense mass build-up through this mechanism struggles to explain the assembly of the most massive BHs observed in the local Universe. Using th
Externí odkaz:
http://arxiv.org/abs/2408.14297
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:
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
In active galactic nuclei, the relationship between UV and X-ray luminosity is well studied (often characterised by $\alpha_\text{ox}$) but often with heterogeneous samples. We have parametrized the intrinsic distribution of X-ray luminosity, $L_\tex
Externí odkaz:
http://arxiv.org/abs/2307.16845
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
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
Autor:
Hidalgo, Paola Rodríguez, Rankine, Amy
A recently-discovered class of outflows, extremely high-velocity outflows (EHVOs), may be key to understanding feedback processes as it is likely the most powerful in terms of mass-energy. These EHVOs have been observed at redshifts 1.052 < z_em < 7.
Externí odkaz:
http://arxiv.org/abs/2209.13642
Autor:
Richards, Gordon T., McCaffrey, Trevor V., Kimball, Amy, Rankine, Amy L., Matthews, James H., Hewett, Paul C., Rivera, Angelica B.
We discuss a probe of the contribution of wind-related shocks to the radio emission in otherwise radio-quiet quasars. Given 1) the non-linear correlation between UV and X-ray luminosity in quasars, 2) that such correlation leads to higher likelihood
Externí odkaz:
http://arxiv.org/abs/2106.07783
Autor:
Richards, Gordon T., Plotkin, Richard M., Hewett, Paul C., Rankine, Amy L., Rivera, Angelica B., Shen, Yue, Shemmer, Ohad
The orientation of the disk of material accreting onto supermassive black holes that power quasars is one of most important quantities that are needed to understand quasars -- both individually and in the ensemble average. We present a hypothesis for
Externí odkaz:
http://arxiv.org/abs/2106.02633
Publikováno v:
MNRAS 505, 3247-3259 (2021)
The flux ratios of high-ionization lines are commonly assumed to indicate the metallicity of the broad emission line region in luminous quasars. When accounting for the variation in their kinematic profiles, we show that the NV/CIV, (SiIV+OIV])/CIV a
Externí odkaz:
http://arxiv.org/abs/2106.01379