Search Publications
The very young resolved stellar populations around stripped-envelope supernovae
Maund, Justyn R.
The massive star origins for Type IIP supernovae (SNe) have been established through direct detection of their red supergiants progenitors in pre-explosion observations; however, there has been limited success in the detection of the progenitors of H-deficient SNe. The final fate of more massive stars, capable of undergoing a Wolf-Rayet phase, and…
Predicting the hypervelocity star population in Gaia
Rossi, E. M.; Brown, A. G. A.; Marchetti, T. +3 more
Hypervelocity stars (HVSs) are amongst the fastest objects in our Milky Way. These stars are predicted to come from the Galactic centre (GC) and travel along unbound orbits across the Galaxy. In the coming years, the ESA satellite Gaia will provide the most complete and accurate catalogue of the Milky Way, with full astrometric parameters for more…
Growing a 'cosmic beast': observations and simulations of MACS J0717.5+3745
Kneib, J. -P.; Eckert, D.; Jullo, E. +18 more
We present a gravitational lensing and X-ray analysis of a massive galaxy cluster and its surroundings. The core of MACS J0717.5+3745 ($M(R\lt 1\, {\rm Mpc})\sim$ $2 \times 10^{15}\, \, {\rm M}_{\odot }$, $z$ = 0.54) is already known to contain four merging components. We show that this is surrounded by at least seven additional substructures with…
Testing modified-gravity theories via wide binaries and GAIA
Sutherland, Will; Pittordis, Charalambos
The standard Lambda cold dark matter model based on general relativity (GR) including cold dark matter (DM) is very successful at fitting cosmological observations, but recent non-detections of candidate dark matter particles mean that various modified-gravity theories remain of significant interest. The latter generally involve modifications to G…
A new catalogue of Galactic novae: investigation of the MMRD relation and spatial distribution
Güver, Tolga; Özdönmez, Aykut; Ege, Ergün +1 more
In this study, a new Galactic novae catalogue is introduced collecting important parameters of these sources such as their light-curve parameters, classifications, full width half-maximum (FWHM) of Hα line, distances and interstellar reddening estimates. The catalogue is also published on a website with a search option via a SQL query and an onlin…
Fast winds drive slow shells: a model for the circumgalactic medium as galactic wind-driven bubbles
Thompson, Todd A.; Weinberg, David H.; Quataert, Eliot +1 more
Successful models of the low-redshift circumgalactic medium (CGM) must account for (1) a large amount of gas, (2) relatively slow gas velocities, (3) a high degree of metal enrichment, (4) the similar absorption properties around both star-forming and passive galaxies, and (5) the observationally inferred temperature and densities of the CGM gas. …
On the kinematics of a runaway Be star population
Evans, N. W.; Boubert, D.
We explore the hypothesis that B-type emission-line stars (Be stars) have their origin in mass-transfer binaries by measuring the fraction of runaway Be stars. We assemble the largest-to-date catalogue of 632 Be stars with 6D kinematics, exploiting the precise astrometry of the Tycho-Gaia Astrometric Solution from the first Gaia data release. Usin…
A direct calibration of thtae IRX-β relation in Lyman-break Galaxies at z = 3-5
Scott, D.; McLure, R. J.; Dunlop, J. S. +17 more
We use a sample of 4209 Lyman-break galaxies (LBGs) at z ≃ 3, 4, and 5 in the UKIRT Infrared Deep Sky Survey Ultra Deep Survey field to investigate the relationship between the observed slope of the stellar continuum emission in the ultraviolet, β, and the thermal dust emission, as quantified via the so-called 'infrared excess' (IRX ≡ LIR/LUV). Th…
GAMA/H-ATLAS: the local dust mass function and cosmic density as a function of galaxy type - a benchmark for models of galaxy evolution
Wang, L.; Baes, M.; Dunne, L. +25 more
We present the dust mass function (DMF) of 15 750 galaxies with redshift z < 0.1, drawn from the overlapping area of the GAMA and H-ATLAS surveys. The DMF is derived using the density corrected Vmax method, where we estimate Vmax using: (i) the normal photometric selection limit (pVmax) and (ii) a bivariate brig…
LAMOST views δ Scuti pulsating stars
Zhang, J.; Qian, S. -B.; He, J. -J. +3 more
About 766 δ Scuti stars were observed by LAMOST by 2017 June 16. Stellar atmospheric parameters of 525 variables were determined, while spectral types were obtained for all samples. In the paper, those spectroscopic data are catalogued. We detect a group of 131 unusual and cool variable stars (UCVs) that are distinguished from the normal δ Scuti s…