Search Publications
The Compton-thick AGN in the Chandra Deep Field North
Georgakakis, A.; Georgantopoulos, I.; Rowan-Robinson, M. +1 more
We present X-ray spectral analysis of the brightest sources (f2{-10 keV} > 10-15 erg cm-2 s-1) in the Chandra Deep Field North. Our sample consists of 222 sources; for the vast majority (171) either a spectroscopic or a photometric redshift is available. Our goal is to discover the Compton-thick AGN i…
The orbital velocity anisotropy of cluster galaxies: evolution
Poggianti, B. M.; Biviano, A.
Context: In nearby clusters early-type galaxies follow isotropic orbits. The orbits of late-type galaxies are instead characterized by slightly radial anisotropy. Little is known about the orbits of the different populations of cluster galaxies at redshift z > 0.3.
Aims: We investigate the redshift evolution of the orbits of cluster galaxie…
An analysis of the transit times of CoRoT-1b
Bean, J. L.
The CoRoT satellite is expected to discover tens of new transiting exoplanets during its mission. For each of these planets there will be a resulting long, continuous sequence of transit times that can be used to search for perturbations arising from an additional planet in the system. I report the results from a study of the transit times for CoR…
A forming, dust-enshrouded disk at z = 0.43: the first example of a massive, late-type spiral rebuilt after a major merger?
Flores, H.; Hammer, F.; Puech, M. +4 more
By combining Ultra Deep Field imagery from HST/ACS with kinematics from VLT/GIRAFFE, we derive a physical model of distant galaxies in a way similar to that achievable for nearby galaxies. A significant part of the evolution in the density of cosmic star formation is related to the rapid evolution of both luminous IR galaxies (LIRGs) and Luminous …
The pulsations of the B5IVe star HD 181231 observed with CoRoT and ground-based spectroscopy
Baudin, F.; Poretti, E.; Michel, E. +25 more
Context:
Aims: By analysing these data, we aim to detect and characterize as many pulsation frequencies as possible, to search for the presence of…
Discovery of slow X-ray pulsations in the high-mass X-ray binary 4U 2206+54
Wilms, J.; Reig, P.; Torrejón, J. M. +3 more
Context: The source 4U 2206+54 is one of the most enigmatic high-mass X-ray binaries. In spite of intensive searches, X-ray pulsations have not been detected in the time range 10-3-103 s. A cyclotron line at ~30 keV has been suggested by various authors but never detected with significance. The stellar wind of the optical com…
The kinematics of coronal mass ejections using multiscale methods
Gallagher, P. T.; Young, C. A.; McAteer, R. T. J. +1 more
Aims: The diffuse morphology and transient nature of coronal mass ejections (CMEs) make them difficult to identify and track using traditional image processing techniques. We apply multiscale methods to enhance the visibility of the faint CME front. This enables an ellipse characterisation to objectively study the changing morphology and kinematic…
AGN/starburst connection in action: the half million second RGS spectrum of NGC 1365
Zezas, A.; Bianchi, S.; Guainazzi, M. +4 more
Context: High-resolution X-ray observations in the imaging and spectral domain have recently opened a new window on active galactic nuclei (AGN) feedback onto the circumnuclear gas. Spectral diagnostics, as well as the remarkable morphological coincidence between [O iii] and X-rays, point to AGN photoionisation as the dominant ionisation mechanism…
The mass profile of early-type galaxies in overdense environments: the case of the double source-plane gravitational lens SL2SJ02176-0513
Kneib, J. -P.; Sygnet, J. -F.; Treu, T. +8 more
Context: The Strong Lensing Legacy Survey (SL2S) provides a sample of the strong lensing events associated with massive distant galaxies, some of which lie in the outskirts of galaxy groups and clusters.
Aims: We investigate the internal structure of early-type galaxies in overdense environments, where tidal forces are expected to alter dark m…
A self-consistent empirical model atmosphere, abundance and stratification analysis of the benchmark roAp star α Circini
Shulyak, D.; Ryabchikova, T.; Kochukhov, O.
Context: Chemically peculiar (CP) stars are unique natural laboratories for the investigation of the microscopic diffusion processes of chemical elements. The element segregation under the influence of gravity and radiation pressure leads to the appearance of strong abundance gradients in the atmospheres of CP stars. Consequently, the atmospheric …