Search Publications
Probing ~L* Lyman-break galaxies at z ~ 7 in GOODS-South with WFC3 on Hubble Space Telescope
Wilkins, Stephen M.; Bunker, Andrew J.; Ellis, Richard S. +5 more
We analyse recently acquired near-infrared Hubble Space Telescope imaging of the Great Observatories Origins Deep Survey (GOODS)-South field to search for star-forming galaxies at z ~ 7.0. By comparing Wide Field Camera 3 (WFC3) 0.98µm Y-band images with Advanced Camera for Surveys (ACS) z-band (0.85µm) images, we identify objects with…
Comparison of approximately isothermal gravitational potentials of elliptical galaxies based on X-ray and optical data
Böhringer, H.; Churazov, E.; Vikhlinin, A. +6 more
We analyse six X-ray bright elliptical galaxies, observed with Chandra and XMM-Newton, and approximate their gravitational potentials by isothermal spheres ϕ = v2c logr over a range of radii from ~0.5 to ~25 kpc. We then compare the circular speed vc derived from X-ray data with the estimators available from optica…
Contamination on Lyman continuum emission at z >~ 3: implication on the ionizing radiation evolution
Vanzella, E.; Cristiani, S.; Nonino, M. +1 more
We investigate the possibility of contamination by lower redshift interlopers in the measure of the ionizing radiation escaping from high-redshift galaxies. Taking advantage of the new ultradeep Very Large Telescope/Visible Multiobject Spectrograph U-band number counts in the Great Observatories Origins Deep Survey (GOODS)-South field, we calculat…
Herschel reveals a Tdust-unbiased selection of z ~ 2 ultraluminous infrared galaxies
Aussel, H.; Elbaz, D.; Le Floc'h, E. +69 more
Using Herschel Photodetector Array Camera (PACS) and Spectral and Photometric Imaging Receiver (SPIRE) observations of Lockman Hole-North and Great Observatories Origins Deep Survey-North (GOODS-N) as part of the Herschel Multi-tiered Extragalactic Survey (HerMES) project, we explore the far-infrared (IR) properties of a sample of mid-IR-selected …
Bars in early- and late-type discs in COSMOS
Kneib, J. -P.; Aussel, H.; Le Floc'h, E. +20 more
We investigate the (large-scale) bar fraction in a mass-complete sample of M > 1010.5 Msolar disc galaxies at 0.2 < z < 0.6 in the Cosmological Evolution Survey (COSMOS) field. The fraction of barred discs strongly depends on mass, disc morphology and specific star formation rate (SSFR). At intermediate stellar mass …
A high charge state coronal mass ejection seen through solar wind charge exchange emission as detected by XMM-Newton
Read, A. M.; Carter, J. A.; Sembay, S.
We present the analysis of an observation by XMM-Newton that exhibits strongly variable, low-energy diffuse X-ray line emission. We reason that this emission is due to localized solar wind charge exchange (SWCX), originating from a passing cloud of plasma associated with a Coronal mass ejection (CME) interacting with neutrals in the Earth's exosph…
Deriving an X-ray luminosity function of dwarf novae based on parallax measurements
Mukai, K.; Osborne, J. P.; Thorstensen, J. R. +1 more
We have derived an X-ray luminosity function using parallax-based distance measurements of a set of 12 dwarf novae, consisting of Suzaku, XMM-Newton and ASCA observations. The shape of the X-ray luminosity function obtained is the most accurate to date, and the luminosities of our sample are concentrated between ~1030 and 1031
A model of force balance in Saturn's magnetodisc
Arridge, C. S.; Achilleos, N.; Guio, P.
We present calculations of magnetic potential functions associated with the perturbation of Saturn's planetary magnetic field by a rotating, equatorially situated disc of plasma. Such structures are central to the dynamics of the rapidly rotating magnetospheres of Saturn and Jupiter. They are `fed' internally by sources of plasma from moons such a…
A bright off-nuclear X-ray source: a type IIn supernova, a bright ULX or a recoiling supermassive black hole in CXOJ122518.6+144545
Fabian, A. C.; Miniutti, G.; Pooley, D. +3 more
In this paper we report the discovery of CXOJ122518.6+144545, a peculiar X-ray source with a position 3.6 +/- 0.2 arcsec off-nuclear from a Sloan Digital Sky Survey Data Release 7 (SDSS DR7) z = 0.0447 galaxy. The 3.6 arcsec offset corresponds to 3.2 kpc at the distance of the galaxy. The 0.3-8keV X-ray flux of this source is 5 × 10-14e…
Improving PSF modelling for weak gravitational lensing using new methods in model selection
Rowe, Barnaby
A simple theoretical framework for the description and interpretation of spatially correlated modelling residuals is presented, and the resulting tools are found to provide a useful aid to model selection in the context of weak gravitational lensing. The description is focused upon the specific problem of modelling the spatial variation of a teles…