Search Publications
The KMOS Redshift One Spectroscopic Survey (KROSS): the origin of disc turbulence in z ≈ 1 star-forming galaxies
Smail, Ian; Konstantopoulos, I. S.; Federrath, C. +27 more
We analyse the velocity dispersion properties of 472 z ∼ 0.9 star-forming galaxies observed as part of the KMOS Redshift One Spectroscopic Survey (KROSS). The majority of this sample is rotationally dominated (83 ± 5 per cent with vC/σ0 > 1) but also dynamically hot and highly turbulent. After correcting for beam smearing …
Discovery of new retrograde substructures: the shards of ω Centauri?
Myeong, G. C.; Evans, N. W.; Belokurov, V. +2 more
We use the Sloan Digital Sky Survey (SDSS)-Gaia catalogue to search for substructure in the stellar halo. The sample comprises 62 133 halo stars with full phase space coordinates and extends out to heliocentric distances of ∼10 kpc. As actions are conserved under slow changes of the potential, they permit identification of groups of stars with a c…
Gravitationally lensed quasars in Gaia - II. Discovery of 24 lensed quasars
McMahon, Richard G.; Auger, Matthew W.; Lemon, Cameron A. +1 more
We report the discovery, spectroscopic confirmation, and preliminary characterization of 24 gravitationally lensed quasars identified using Gaia observations. Candidates were selected in the Pan-STARRS footprint with quasar-like WISE colours or as photometric quasars from Sloan Digital Sky Survey (SDSS), requiring either multiple detections in Gai…
The scatter of the M dwarf mass-radius relationship
Hermes, J. J.; Gänsicke, B. T.; Dhillon, V. S. +14 more
M dwarfs are prime targets in the hunt for habitable worlds around other stars. This is due to their abundance as well as their small radii and low masses and temperatures, which facilitate the detection of temperate, rocky planets in orbit around them. However, the fundamental properties of M dwarfs are difficult to constrain, often limiting our …
The ALMA-PILS survey: the sulphur connection between protostars and comets: IRAS 16293-2422 B and 67P/Churyumov-Gerasimenko
van Dishoeck, Ewine F.; Drozdovskaya, Maria N.; Jørgensen, Jes K. +9 more
The evolutionary past of our Solar system can be pieced together by comparing analogous low-mass protostars with remnants of our Protosolar Nebula - comets. Sulphur-bearing molecules may be unique tracers of the joint evolution of the volatile and refractory components. ALMA Band 7 data from the large unbiased Protostellar Interferometric Line Sur…
Lost but not forgotten: intracluster light in galaxy groups and clusters
Donahue, Megan; Mulchaey, John S.; Connor, Thomas +4 more
With Hubble Space Telescope imaging, we investigate the progenitor population and formation mechanisms of the intracluster light (ICL) for 23 galaxy groups and clusters at 0.29 ≤ z ≤ 0.89. The colour gradients of the BCG+ICL become bluer with increasing radius out to 53-100 kpc for all but one system, suggesting that violent relaxation after major…
The 1.5 Ms observing campaign on IRAS 13224-3809 - I. X-ray spectral analysis
Harrison, F. A.; Fabian, A. C.; Miller, J. M. +16 more
We present a detailed spectral analysis of the recent 1.5 Ms XMM-Newton observing campaign on the narrow-line Seyfert 1 galaxy IRAS 13224-3809, taken simultaneously with 500 ks of NuSTAR data. The X-ray light curve shows three flux peaks, registering at about 100 times the minimum flux seen during the campaign, and rapid variability with a time-sc…
NGTS-1b: a hot Jupiter transiting an M-dwarf
Wheatley, Peter J.; Bayliss, Daniel; Raddi, Roberto +40 more
We present the discovery of NGTS-1b, a hot Jupiter transiting an early M-dwarf host (Teff,* = 3916 ^{+71}_{-63} K) in a P = 2.647 d orbit discovered as part of the Next Generation Transit Survey (NGTS). The planet has a mass of 0.812 ^{+0.066}_{-0.075} MJ, making it the most massive planet ever discovered transiting an M-dwar…
The distances to Novae as seen by Gaia
Schaefer, Bradley E.
The Gaia spacecraft has just released a large set of parallaxes, including 41 novae for which the fractional error is <30 per cent. I have used these to evaluate the accuracy and bias of the many prior methods for getting nova distances. The best of the prior methods is the geometrical parallaxes from Hubble Space Telescope for just four novae,…
New constraints on time-dependent variations of fundamental constants using Planck data
Chluba, Jens; Hart, Luke
Observations of the cosmic microwave background (CMB) today allow us to answer detailed questions about the properties of our Universe, targeting both standard and non-standard physics. In this paper, we study the effects of varying fundamental constants (i.e. the fine-structure constant, αEM, and electron rest mass, me) arou…