Search Publications
Discovery of a magnetic field in the rapidly rotating O-type secondary of the colliding-wind binary HD 47129 (Plaskett's star)
Martins, F.; Wade, G. A.; Neiner, C. +14 more
We report the detection of a strong, organized magnetic field in the secondary component of the massive O8III/I+O7.5V/III double-lined spectroscopic binary system HD 47129 (Plaskett's star) in the context of the Magnetism in Massive Stars survey. Eight independent Stokes V observations were acquired using the Echelle SpectroPolarimetric Device for…
Velocity width measurements of the coolest X-ray emitting material in the cores of clusters, groups and elliptical galaxies
Fabian, A. C.; Sanders, J. S.
We examine the velocity width of cool X-ray emitting material using XMM-Newton Reflection Grating Spectrometer (RGS) spectra of a sample of clusters and group of galaxies and elliptical galaxies. Improving on our previous analyses, we apply a spectral model which accounts for broadening due to the spatial extent of the source. With both convention…
An improved model for the infrared emission from the zodiacal dust cloud: cometary, asteroidal and interstellar dust
Rowan-Robinson, M.; May, B.
We model the infrared emission from zodiacal dust detected by the IRAS and COBE missions, with the aim of estimating the relative contributions of asteroidal, cometary and interstellar dust to the zodiacal cloud. Our most important result is the detection of an isotropic component of foreground radiation due to the interstellar dust.
The dust…On the two high-metallicity DLAs at z = 2.412 and 2.583 towards Q 0918+1636
Vestergaard, M.; Fynbo, J. P. U.; Krühler, T. +9 more
The quasar Q0918+1636 (z = 3.07) has two intervening high-metallicity Damped Lyman α Absorbers (DLAs) along the line of sight, at redshifts of z = 2.412 and 2.583. The z = 2.583 DLA is located at a large impact parameter of 16.2 kpc, and despite this large impact parameter it has a very high metallicity (consistent with solar), a substantial fract…
The Herschel Virgo Cluster Survey - XII. FIR properties of optically selected Virgo cluster galaxies
Ciesla, L.; Bomans, D. J.; Boquien, M. +24 more
The Herschel Virgo Cluster Survey (HeViCS) is the deepest, confusion-limited survey of the Virgo Cluster at far-infrared (FIR) wavelengths. The entire survey at full depth covers ∼55 deg2 in five bands (100-500 µm), encompassing the areas around the central dominant elliptical galaxies (M87, M86 and M49) and extends as far as the …
On the association between core-collapse supernovae and H ii regions
Crowther, Paul A.
Previous studies of the location of core-collapse supernovae (ccSNe) in their host galaxies have variously claimed an association with H ii regions; no association or an association only with hydrogen-deficient ccSNe. Here, we examine the immediate environments of 39 ccSNe whose positions are well known in nearby (≤15 Mpc), low-inclination (≤65°) …
The SWELLS survey - V. A Salpeter stellar initial mass function in the bulges of massive spiral galaxies
Treu, Tommaso; Marshall, Philip J.; Auger, M. W. +6 more
Recent work has suggested that the stellar initial mass function (IMF) is not universal, but rather is correlated with galaxy stellar mass, stellar velocity dispersion or morphological type. In this paper, we investigate variations of the IMF within individual galaxies. For this purpose, we use strong lensing and gas kinematics to measure independ…
A new way to measure supermassive black hole spin in accretion disc-dominated active galaxies
Done, Chris; Ward, Martin; Jin, C. +1 more
We show that disc continuum fitting can be used to constrain black hole spin in a subclass of narrow-line Seyfert 1 (NLS1) active galactic nuclei as their low mass and high mass accretion rate means that the disc peaks at energies just below the soft X-ray bandpass. We apply the technique to the NLS1 PG1244+026, where the optical/UV/X-ray spectrum…
On the association of the ultraluminous X-ray sources in the Antennae galaxies with young stellar clusters
Fabrika, Sergei; Poutanen, Juri; Greiner, Jochen +2 more
The nature of the ultraluminous X-ray sources (ULXs) in the nearby galaxies is a matter of debates. One of the popular hypothesis associates them with accretion at a sub-Eddington rate on to intermediate-mass black holes. Another possibility is a stellar-mass black hole in a high-mass X-ray binary accreting at super-Eddington rates. In this paper,…
Gas accretion as a dominant formation mode in massive galaxies from the GOODS NICMOS Survey
Conselice, Christopher J.; Bluck, Asa F. L.; Mortlock, Alice +2 more
The ability to resolve all processes which drive galaxy formation is one of the most fundamental goals in extragalactic astronomy. While star formation rates and the merger history are now measured with increasingly high certainty, the role of gas accretion from the intergalactic medium in supplying gas for star formation still remains largely unk…