Search Publications
ALMA observations of cold molecular gas filaments trailing rising radio bubbles in PKS 0745-191
O'Connell, R. W.; Fabian, A. C.; Combes, F. +16 more
We present ALMA observations of the CO(1-0) and CO(3-2) line emission tracing filaments of cold molecular gas in the central galaxy of the cluster PKS 0745-191. The total molecular gas mass of 4.6± 0.3× 109 M_{⊙}, assuming a Galactic XCO factor, is divided roughly equally between three filaments each extending radially 3-5 kp…
Modelling supernova line profile asymmetries to determine ejecta dust masses: SN 1987A from days 714 to 3604
Barlow, M. J.; Bevan, Antonia
The late-time optical and near-IR line profiles of many core-collapse supernovae exhibit a red-blue asymmetry as a result of greater extinction by internal dust of radiation emitted from the receding parts of the supernova ejecta. We present here a new code, DAMOCLES, that models the effects of dust on the line profiles of core-collapse supernovae…
Dead or Alive? Long-term evolution of SN 2015bh (SNhunt275)
Brown, P. J.; Smartt, S. J.; Kotak, R. +37 more
Supernova (SN) 2015bh (or SNhunt275) was discovered in NGC 2770 on 2015 February with an absolute magnitude of Mr ∼ -13.4 mag, and was initially classified as an SN impostor. Here, we present the photometric and spectroscopic evolution of SN 2015bh from discovery to late phases (∼1 yr after). In addition, we inspect archival images of t…
A self-consistent model for the evolution of the gas produced in the debris disc of β Pictoris
Pringle, J. E.; Kral, Q.; Juhász, A. +3 more
This paper presents a self-consistent model for the evolution of gas produced in the debris disc of β Pictoris. Our model proposes that atomic carbon and oxygen are created from the photodissociation of CO, which is itself released from volatile-rich bodies in the debris disc due to grain-grain collisions or photodesorption. While the CO lasts les…
X-ray spectral properties of the AGN sample in the northern XMM-XXL field
Shen, Yue; Nandra, Kirpal; Streblyanska, Alina +7 more
In this paper we describe and publicly release a catalogue consisting of 8445 point-like X-ray sources detected in the XMM-XXL north survey. For the 2512 AGN which have reliable spectroscopy from SDSS-III/BOSS, we present the X-ray spectral fitting which has been computed with a Bayesian approach. We have also applied an X-ray spectral stacking me…
Baryon cycling in the low-redshift circumgalactic medium: a comparison of simulations to the COS-Halos survey
Kollmeier, Juna A.; Davé, Romeel; Tumlinson, Jason +8 more
We analyse the low-redshift (z ≈ 0.2) circumgalactic medium (CGM) by comparing absorption-line data from the COS-Halos survey to absorption around a matched galaxy sample from two cosmological hydrodynamic simulations. The models include different prescriptions for galactic outflows, namely hybrid energy/momentum driven wind (ezw), and constant wi…
HerMES: a search for high-redshift dusty galaxies in the HerMES Large Mode Survey - catalogue, number counts and early results
Pérez-Fournon, I.; Ivison, R. J.; Clements, D. L. +25 more
Selecting sources with rising flux densities towards longer wavelengths from Herschel/Spectral and Photometric Imaging Receiver (SPIRE) maps is an efficient way to produce a catalogue rich in high-redshift (z > 4) dusty star-forming galaxies. The effectiveness of this approach has already been confirmed by spectroscopic follow-up observations, …
Shining a light on galactic outflows: photoionized outflows
Chisholm, John; Leitherer, Claus; Chen, Yanmei +2 more
We study the ionization structure of galactic outflows in 37 nearby, star-forming galaxies with the Cosmic Origins Spectrograph on the Hubble Space Telescope. We use the O I, Si II, Si III, and Si IV ultraviolet absorption lines to characterize the different ionization states of outflowing gas. We measure the equivalent widths, line widths, and ou…
Deep XMM observations of Draco rule out at the 99 per cent confidence level a dark matter decay origin for the 3.5 keV line
Profumo, Stefano; Jeltema, Tesla
We searched for an X-ray line at energies around 3.5 keV in deep, ∼1.6 Ms XMM-Newton observations of the dwarf spheroidal galaxy Draco. No line was found in either the Metal Oxide Semi-conductor (MOS) or the p-type/n-type semiconductor (PN) detectors. The data in this energy range are completely consistent with a single, unfolded power-law modelli…
Deep Chandra observations of Pictor A
Stawarz, Ł.; Hardcastle, M. J.; Croston, J. H. +7 more
We report on deep Chandra observations of the nearby broad-line radio galaxy Pictor A, which we combine with new Australia Telescope Compact Array (ATCA) observations. The new X-ray data have a factor of 4 more exposure than observations previously presented and span a 15 yr time baseline, allowing a detailed study of the spatial, temporal and spe…