Search Publications
Herschel-ATLAS: the far-infrared properties and star formation rates of broad absorption line quasi-stellar objects
Ivison, R. J.; Clements, D. L.; Cooray, A. +20 more
We have used data from the Herschel Astrophysical Terahertz Large-Area Survey (H-ATLAS) at 250, 350 and 500 µm to determine the far-infrared (FIR) properties of 50 broad absorption line quasars (BAL QSOs). Our sample contains 49 high-ionization BAL QSOs (HiBALs) and one low-ionization BAL QSO (LoBAL) which are compared against a sample of 32…
HST/STIS spectroscopy of the magnetic Of?p star HD 108: the low state at ultraviolet wavelengths
Bouret, J. -C.; Howarth, I. D.; Hillier, D. J. +6 more
We present the first ultraviolet spectrum of the peculiar, magnetic Of?p star HD 108 obtained in its spectroscopic low state. The new data, obtained with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope, reveal significant changes compared to IUE spectra obtained in the high state: N Vλ1240, Si IVλ1400 and C IVλ1550 pr…
The continued spectral and temporal evolution of RX J0720.4-3125
Haberl, F.; de Vries, C. P.; Vink, J. +4 more
RX J0720.4-3125 is the most peculiar object among a group of seven isolated X-ray pulsars (the so-called Magnificent Seven), since it shows long-term variations of its spectral and temporal properties on time-scales of years. This behaviour was explained by different authors either by free precession (with a 7 or 14 yr period) or possibly a glitch…
Two-dimensional kinematics of SLACS lenses - IV. The complete VLT-VIMOS data set
Treu, Tommaso; Czoske, Oliver; Koopmans, Léon V. E. +2 more
This paper presents the full Very Large Telescope (VLT)/VIMOS-IFU data set and related data products from an ESO Large Programme with the observational goal of obtaining two-dimensional kinematic data of early-type lens galaxies, out to one effective radius. The sample consists of 17 early-type galaxies (ETGs) selected from the SLACS gravitational…
Solid-phase C60 in the peculiar binary XX Oph?
van Loon, J. Th.; Gehrz, R. D.; Eyres, S. P. S. +8 more
We present infrared spectra of the binary XX Oph obtained with the Infrared Spectrograph on the Spitzer Space Telescope. The data show some evidence for the presence of solid C60- the first detection of C60 in the solid phase - together with the well-known 'unidentified infrared' emission features. We suggest that, in the cas…
Radially extended kinematics in the S0 galaxy NGC 2768 from planetary nebulae, globular clusters and starlight
Cortesi, Arianna; Forbes, Duncan A.; Romanowsky, Aaron J. +7 more
There are only a few tracers available to probe the kinematics of individual early-type galaxies beyond one effective radius. Here we directly compare a sample of planetary nebulae (PNe), globular clusters (GCs) and galaxy starlight velocities out to approximately four effective radii, in the S0 galaxy NGC 2768. Using a bulge-to-disc decomposition…
A deep, wide-field study of Holmberg II with Suprime-Cam: evidence for ram pressure stripping
Jablonka, Pascale; Arimoto, Nobuo; Ferguson, Annette M. N. +3 more
We present a deep, wide-field optical study of the M81 group dwarf galaxy Holmberg II (HoII) based on Subaru/Suprime-Cam imaging. Individual stars are resolved down to I ∼ 25.2, that is, about 1.5 mag below the tip of the red giant branch (RGB). We use resolved star counts in the outskirts of the galaxy to measure the radial surface brightness pro…
The blue straggler star population in NGC 6229
Dalessandro, E.; Sanna, N.; Beccari, G. +3 more
We have used a combination of high-resolution Hubble Space Telescope Wide Field Planetary Camera 2 and wide-field ground-based observations in ultraviolet and optical bands to study the blue straggler star (BSS) population of the outer halo globular cluster NGC 6229 over its entire radial extent. A total of 64 bright BSS (with m255≤ 21.…
Herschel and JCMT observations of the early-type dwarf galaxy NGC 205
Boquien, M.; Roussel, H.; Fritz, J. +18 more
We present Herschel dust continuum, James Clerk Maxwell Telescope CO (3-2) observations and a search for [C II] 158 ?m and [O I] 63 ?m spectral line emission for the brightest early-type dwarf satellite of Andromeda, NGC 205. While direct gas measurements [Mg∼ 1.5 × 106 M⊙, H I+ CO (1-0)] have proven to be inconsis…
The XMM-Newton survey of the Small Magellanic Cloud: XMMU J010633.1-731543 and XMMU J010743.1-715953, two new Be/X-ray binary systems★
Haberl, F.; Hatzidimitriou, D.; Mereghetti, S. +6 more
In the course of the XMM-Newton survey of the Small Magellanic Cloud (SMC), two new bright X-ray sources were discovered exhibiting the spectral characteristics of high-mass X-ray binaries - but revealing only weak evidence for pulsations in just one of the objects (at 153 s in XMMU J010743.1-715953). The accurate X-ray source locations permit the…