Search Publications
The XMM-Newton view of the central degrees of the Milky Way
Haberl, F.; Nandra, K.; Ponti, G. +10 more
The deepest XMM-Newton mosaic map of the central 1.5 ° of the Galaxy is presented, including a total of about 1.5 Ms of EPIC-pn cleaned exposures in the central 15 arcsec and about 200 ks outside. This compendium presents broad-band X-ray continuum maps, soft X-ray intensity maps, a decomposition into spectral components and a comparison of the X-…
The frequency and infrared brightness of circumstellar discs at white dwarfs
Gänsicke, B. T.; Rocchetto, M.; Farihi, J. +1 more
White dwarfs whose atmospheres are polluted by terrestrial-like planetary debris have become a powerful and unique tool to study evolved planetary systems. This paper presents results for an unbiased Spitzer Infrared Array Camera search for circumstellar dust orbiting a homogeneous and well-defined sample of 134 single white dwarfs. The stars were…
ALMA and Herschel reveal that X-ray-selected AGN and main-sequence galaxies have different star formation rate distributions
Daddi, E.; Elbaz, D.; Dickinson, M. +15 more
Using deep Herschel and ALMA observations, we investigate the star formation rate (SFR) distributions of X-ray-selected active galactic nucleus (AGN) host galaxies at 0.5 < z < 1.5 and 1.5 < z < 4, comparing them to that of normal, star-forming (i.e. `main-sequence', or MS) galaxies. We find that 34-55 per cent of AGNs in our sample ha…
A Suzaku search for dark matter emission lines in the X-ray brightest galaxy clusters
Simionescu, A.; Kaastra, J. S.; Allen, S. W. +3 more
We present the results of a search for unidentified emission lines in deep Suzaku X-ray spectra of the central regions of the X-ray brightest galaxy clusters: Perseus, Coma, Virgo and Ophiuchus. We analyse an optimized energy range (3.2-5.3 keV) that is relatively free of instrumental features, and a plasma emission model incorporating the abundan…
Deconstructing the galaxy stellar mass function with UKIDSS and CANDELS: the impact of colour, structure and environment
Fontana, Adriano; Grogin, Norman A.; Kocevski, Dale D. +15 more
We combine photometry from the Ultra Deep Survey (UDS), Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) UDS and CANDELS the Great Observatories Origins Deep Survey-South (GOODS-S) surveys to construct the galaxy stellar mass function probing both the low- and high-mass end accurately in the redshift range 0.3 < z < 3…
Diagnosing the accretion flow in ultraluminous X-ray sources using soft X-ray atomic features
Middleton, Matthew J.; Roberts, Timothy P.; Walton, Dominic J. +5 more
The lack of unambiguous detections of atomic features in the X-ray spectra of ultraluminous X-ray sources (ULXs) has proven a hindrance in diagnosing the nature of the accretion flow. The possible association of spectral residuals at soft energies with atomic features seen in absorption and/or emission and potentially broadened by velocity dispers…
The powerful jet of an off-nuclear intermediate-mass black hole in the spiral galaxy NGC 2276
Roberts, T. P.; Mezcua, M.; Sutton, A. D. +1 more
Jet ejection by accreting black holes is a mass invariant mechanism unifying stellar and supermassive black holes (SMBHs) that should also apply for intermediate-mass black holes (IMBHs), which are thought to be the seeds from which SMBHs form. We present the detection of an off-nuclear IMBH of ∼5 × 104 M⊙ located in an unusu…
Properties of dark subhaloes from gaps in tidal streams
Erkal, Denis; Belokurov, Vasily
Cold or warm, the dark matter substructure spectrum must extend to objects with masses as low as 107 M⊙, according to the most recent Lyman α measurements. Around a Milky Way-like galaxy, more than a thousand of these subhaloes will not be able to form stars but are dense enough to survive even deep down in the potential well…
Stellar diameters and temperatures - VI. High angular resolution measurements of the transiting exoplanet host stars HD 189733 and HD 209458 and implications for models of cool dwarfs
López-Morales, Mercedes; Kane, Stephen R.; Brewer, John +24 more
We present direct radii measurements of the well-known transiting exoplanet host stars HD 189733 and HD 209458 using the CHARA Array interferometer. We find the limb-darkened angular diameters to be θLD = 0.3848 ± 0.0055 and 0.2254 ± 0.0072 mas for HD 189733 and HD 209458, respectively. HD 189733 and HD 209458 are currently the only two…
The XMM Cluster Survey: testing chameleon gravity using the profiles of clusters
Hilton, Matt; Zhao, Gong-Bo; Stott, John P. +17 more
The chameleon gravity model postulates the existence of a scalar field that couples with matter to mediate a fifth force. If it exists, this fifth force would influence the hot X-ray emitting gas filling the potential wells of galaxy clusters. However, it would not influence the clusters weak lensing signal. Therefore, by comparing X-ray and weak …