Search Publications
Linking black hole growth with host galaxies: the accretion-stellar mass relation and its cosmic evolution
Brandt, W. N.; Vignali, C.; Xue, Y. Q. +9 more
Previous studies suggest that the growth of supermassive black holes (SMBHs) may be fundamentally related to host-galaxy stellar mass (M⋆). To investigate this SMBH growth-M⋆ relation in detail, we calculate long-term SMBH accretion rate as a function of M⋆ and redshift [\overlineBHAR(M_{\star }, z)] over ranges of…
Transient spiral structure and the disc velocity substructure in Gaia DR2
Bovy, Jo; Grand, Robert J. J.; Kawata, Daisuke +2 more
The second data release from ESA's Gaia mission has revealed many ridge-like structures in the velocity distribution of the Milky Way. We show that these can arise naturally from winding transient spiral structure that is commonly seen in N-body simulations of disc galaxies. We construct test particle models of the winding spiral structure, and co…
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…