48 citations · 138 across the 7 of their papers we have counts for
7 papers
SKA Science Data Challenge 2: analysis and results
P. Hartley, A. Bonaldi, R. Braun +105
The Square Kilometre Array Observatory (SKAO) will explore the radio sky to new depths in order to conduct transformational science. SKAO data products made available to astronomer…
The Changing-Look Quasar Mrk 590 is Awakening
S. Mathur, K. D. Denney, A. Gupta +9
Mrk 590 was originally classified as a Seyfert 1 galaxy, but then it underwent dramatic changes: the nuclear luminosity dropped by over two orders of magnitude and the broad emissi…
The broad band SEDs of four 'hypervariable' AGN
James S. Collinson, Martin J. Ward, Andy Lawrence +6
We present an optical to X-ray spectral analysis of four 'hypervariable' AGN (HVAs) discovered by comparing Pan-STARRS data to that from SDSS over a 10 year baseline (Lawrence et a…
Reaching the Peak of the quasar spectral energy distribution - II. Exploring the accretion disc, dusty torus and host galaxy
James S. Collinson, Martin J. Ward, Hermine Landt +3
We continue our study of the spectral energy distributions (SEDs) of 11 AGN at 1.5 < z < 2.2, with optical-NIR spectra, X-ray data and mid-IR photometry. In a previous paper we pre…
Spectral analysis of four 'hypervariable' AGN: a microneedle in the haystack?
A. Bruce, A. Lawrence, C. MacLeod +13
We analyze four extreme active galactic nuclei (AGN) transients to explore the possibility that they are caused by rare, high-amplitude microlensing events. These previously unknow…
Physical properties and the variability mechanism of the He I outflow in NGC 4151
Conor Wildy, Hermine Landt, Michael R. Goad +2
We report on variable helium absorption lines in NGC 4151 observed across six epochs of quasi-simultaneous near-infrared and optical data. These observations cover the transitions…
Reaching the Peak of the Quasar Spectral Energy Distribution I: Observations and Models
James S. Collinson, Martin J. Ward, Chris Done +3
We perform a spectral analysis of a sample of 11 medium redshift (1.5 < z < 2.2) quasars. Our sample all have optical spectra from the SDSS, infrared spectra from GNIRS and TSPEC,…