Search Publications
Constraints on star-forming galaxies at z >= 6.5 from HAWK-I Y-band imaging of GOODS-South
Bunker, Andrew; Jarvis, Matt J.; Hickey, Samantha +2 more
We present the results of our search for high-redshift Lyman-break galaxies over the GOODS-South field. We use Hubble Space Telescope (HST)-ACS data in B, V, i' & z', Very Large Telescope (VLT)-ISAAC J and Ks, Spitzer-Infrared Array Camera (IRAC) 3.6, 4.5, 5.8 and 8.0 µm data in conjunction with the new HAWK-I Y-band science verification…
Final verdict from XMM-Newton: the X-ray obscured Seyfert galaxy NGC 5506 has a broad Fe Kα line
Bianchi, S.; Guainazzi, M.; Dadina, M. +4 more
We present the first unambiguous evidence of a broad (Gaussian width ~330 eV) component of the iron Kα fluorescent emission line in the X-ray obscured narrow-line Seyfert 1 galaxy, NGC 5506. This is the main result of a spectroscopic monitoring campaign on this source, performed with the XMM-Newton observatory between 2001 February and …
The lensing efficiencies of MACS X-ray-selected versus RCS optically selected galaxy clusters
Maoz, Dan; Bartelmann, Matthias; Ebeling, Harald +2 more
The statistics of strongly lensed arcs in samples of galaxy clusters provide information on cluster structure that is complementary to that from individual clusters. However, samples of clusters that have been analysed to date have been either small, heterogeneous or observed with limited angular resolution. We measure the lensed-arc statistics of…
The orbital period in the supergiant fast X-ray transient IGR J16465-4507
Hill, A. B.; Bird, A. J.; Scaringi, S. +6 more
Timing analysis of the INTEGRAL-IBIS and Swift-BAT light curves of the supergiant fast X-ray transient (SFXT) IGR J16465-4507 has identified a period of 30.32 +/- 0.02 d which we interpret as the orbital period of the binary system. In addition 11 outbursts (nine of which are previously unpublished) have been found between MJD 52652 and 54764, all…
SDSS J150634.27+013331.6: the second compact elliptical galaxy in the NGC 5846 group
Chilingarian, Igor V.; Bergond, Gilles
We report the discovery of the second compact elliptical (cE) galaxy SDSS J150634.27+013331.6 in the nearby NGC 5846 group by the Virtual Observatory (VO) workflow. This object (MB = -15.98 mag, Re = 0.24 kpc) becomes the fifth cE where the spatially resolved kinematics and stellar populations can be obtained. We used archiva…
The effects of an active galactic nucleus on host galaxy colour and morphology measurements
Ivison, R. J.; Koekemoer, A. M.; Faber, S. M. +11 more
We assess the effects of simulated active galactic nuclei (AGN) on the colour and morphology measurements of their host galaxies. To test the morphology measurements, we select a sample of galaxies not known to host AGN and add a series of point sources scaled to represent specified fractions of the observed V-band light detected from the resultin…
Dissecting the Lyman α emission halo of LAB1
Morris, Simon L.; de Zeeuw, P. T.; Geach, James E. +4 more
We report observations of Lyman alpha blob 1 (LAB1) in the SSA 22 protocluster region (z = 3.09) with the integral-field spectrograph SAURON. We increased the signal-to-noise ratio in the spectra by more than a factor of 3 compared to our previous observations. This allows us to probe the structure of the LAB system in detail, examining its struct…
The OGLE view of microlensing towards the Magellanic Clouds - II. OGLE-II Small Magellanic Cloud data
Soszyński, I.; Udalski, A.; Szymański, M. K. +8 more
The primary goal of this paper is to provide evidence that can prove true or false the hypothesis that dark matter in the Galactic halo can clump into stellar-mass compact objects. If such objects exist, they would act as lenses to external sources in the Magellanic Clouds, giving rise to an observable effect of microlensing. We present the result…
Host galaxy colour gradients and accretion disc obscuration in AEGIS z ~ 1 X-ray-selected active galactic nuclei
Faber, S. M.; Lotz, J. M.; Coil, A. L. +7 more
We describe the effect of active galactic nucleus (AGN) light on host galaxy optical and UV-optical colours, as determined from X-ray-selected AGN host galaxies at z ~ 1, and compare the AGN host galaxy colours to those of a control sample matched to the AGN sample in both redshift and stellar mass. We identify as X-ray-selected AGNs 8.7+4
A systematic study of low-mass X-ray binaries in the M31 globular cluster system
Kundu, Arunav; Zepf, Stephen E.; Maccarone, Thomas J. +1 more
We investigate low-mass X-ray binaries (LMXBs) in the M31 globular cluster (GC) system using data from the 2XMMi catalogue. These X-ray data are based on all publicly available XMM-Newton observations of the galaxy. This new survey provides the most complete and homogeneous X-ray survey of M31's GCs to date, covering >80 per cent of the confirm…