Search Publications
Spatially resolved dust properties and quasar-galaxy decomposition of a hyper-luminous infrared galaxy at z = 4.4
Krumholz, Mark R.; Wisnioski, Emily; Tsukui, Takafumi +1 more
We report spatially resolved dust properties of the quasar host galaxy BRI1335-0417 at redshift z = 4.4 constrained by the Atacama Large Millimetre/submillimetre Array observations. The dust temperature map, derived from a greybody fit to rest frame 90 and 161 µm continuum images, shows a steep increase towards the centre, reaching 57.1 ± 0.…
From X-rays to physical parameters: a comprehensive analysis of thermal tidal disruption event X-ray spectra
Mummery, Andrew; Saxton, Richard; Wevers, Thomas +1 more
We perform a comprehensive analysis of a population of 19 X-ray bright tidal disruption events (TDEs), fitting their X-ray spectra with a new, physically self-consistent, relativistic accretion disc model. Not all of the TDEs inhabit regions of parameter space where the model is valid, or have sufficient data for a detailed analysis, and physicall…
TESS spots a mini-neptune interior to a hot saturn in the TOI-2000 system
Trifonov, Trifon; Henning, Thomas; Barclay, Thomas +52 more
Hot jupiters (P < 10 d, M > 60 M⊕) are almost always found alone around their stars, but four out of hundreds known have inner companion planets. These rare companions allow us to constrain the hot jupiter's formation history by ruling out high-eccentricity tidal migration. Less is known about inner companions to hot Saturn-mass p…
The impact of time-dependent stellar activity on exoplanet atmospheres
Loyd, R. O. Parke; France, Kevin; Tsai, Shang-Min +3 more
M-dwarfs are thought to be hostile environments for exoplanets. Stellar events are very common on such stars. These events might cause the atmospheres of exoplanets to change significantly over time. It is not only the major stellar flare events that contribute to this disequilibrium, but the smaller flares might also affect the atmospheres in an …
The SOUX AGN sample: optical/UV/X-ray SEDs and the nature of the disc
Done, Chris; Lusso, Elisabeta; Landt, Hermine +4 more
We use the SOUX sample of ~700 active galactic nucleus (AGN) to form average optical-ultraviolet (UV)-X-rays spectral energy distributions (SEDs) on a two-dimensional (2D) grid of MBH and L2500. We compare these with the predictions of a new AGN SED model, QSOSED, which includes prescriptions for both hot and warm Comptonizat…
The bright extragalactic ALMA redshift survey (BEARS) - II. Millimetre photometry of gravitational lens candidates
Berta, S.; Andreani, P.; Pérez-Fournon, I. +49 more
We present 101- and 151-GHz ALMA continuum images for 85 fields selected from Herschel observations that have 500-µm flux densities >80 mJy and 250-500-µm colours consistent with z > 2, most of which are expected to be gravitationally lensed or hyperluminous infrared galaxies. Approximately half of the Herschel 500-µm sourc…
The study of 11 contact binaries with mass ratios less than 0.1
Wang, Xi; Li, Kai; Gao, Xing +6 more
Multi-band photometric observations of 11 totally eclipsing contact binaries were carried out. Applying the Wilson-Devinney program, photometric solutions were obtained. There are two W-subtype systems, which are CRTS J133031.1+161202 and CRTS J154254.0+324652, and the rest of the systems are A-subtype systems. CRTS J154254.0 + 324652 has the high…
Resolving ambiguities in the inferred star formation histories of intense [O III] emitters in the reionization Era
Laporte, N.; Ellis, R. S.; Roberts-Borsani, G. +1 more
Early JWST spectroscopic campaigns have confirmed the presence of strong [O III] line-emitting galaxies in the redshift interval 7 < z < 9. Although deduced earlier from Spitzer photometry as an indicative of young stellar populations, some studies suggested the relevant photometric excesses attributed to [O III] emission could, in part, be …
The LOFAR Two-metre Sky Survey: the radio view of the cosmic star formation history
Prandoni, I.; Hardcastle, M. J.; Röttgering, H. J. A. +9 more
We present a detailed study of the cosmic star formation history over 90 per cent of cosmic time (0 ≲ z ≲ 4), using deep, radio continuum observations that probe star formation activity independent of dust. The Low Frequency Array Two Metre Sky Survey has imaged three well-studied extragalactic fields, Elais-N1, Boötes, and the Lockman Hole, reach…
Rimmed and rippled accretion disc models to explain AGN continuum lags
Starkey, D. A.; Huang, Jiamu; Horne, Keith +1 more
We propose a solution to the problem of accretion disc sizes in active galactic nuclei being larger when measured by reverberation mapping than predicted by theory. Considering the disc's exposed-surface thickness profile H(r), our solution invokes a steep rim or rippled structures irradiated by the central lamp-post. We model the continuum lags a…