Search Publications
A ionized reflecting skin above the accretion disk of GX 349+2
Robba, N. R.; Papitto, A.; Burderi, L. +4 more
Context: The broad emission features in the Fe-Kα region of X-ray binary spectra represent an invaluable probe to constrain the geometry and the physics of these systems. Several Low Mass X-ray binary systems (LMXBs) containing a neutron star (NS) show broad emission features between 6 and 7 keV and most of them are now interpreted as reflection f…
High energy emission and polarisation limits for the INTEGRAL burst GRB 061122
McGlynn, S.; McBreen, S.; Foley, S. +6 more
Context: GRB 061122 is one of the brightest GRBs detected within INTEGRAL's field of view to date, with a peak flux (20-200 keV) of 32 photons cm-2 s-1 and fluence of 2 × 10-5 erg cm-2. The Spectrometer aboard INTEGRAL, SPI, can measure linear polarisation in bright GRBs through the process of Compton sc…
New X-ray detections of Herbig stars
Schmitt, J. H. M. M.; Bouvier, J.; Robrade, J. +1 more
Context: The interpretation of X-ray detections from Herbig Ae/Be stars is disputed as it is not clear whether these intermediate-mass pre-main sequence stars are able to drive a dynamo and ensuing phenomena of magnetic activity. Alternative X-ray production mechanisms, related to stellar winds, star-disk magnetospheres, or unresolved late-type T …
Is cold gas fuelling the radio galaxy NGC 315?
Capetti, A.; Morganti, R.; de Ruiter, H. R. +5 more
We present WSRT, VLA and VLBI observations of the H i absorption in the radio galaxy NGC 315. The main result is that two H i absorbing systems are detected against the central region. In addition to the known highly redshifted, very narrow component, we detect relatively broad (FWZI ~ 150 km s-1) absorption. This broad component is red…
Planetary transit candidates in CoRoT-LRc01 field
Mazeh, T.; Aigrain, S.; Alapini, A. +52 more
Aims: We present here the list of planetary transit candidates detected in the first long run observed by CoRoT: LRc01, towards the galactic center in the direction of Aquila, which lasted from May to October 2007.
Methods: we analyzed 3719 (33%) sources in the chromatic bands and 7689 in the monochromatic band. Instrumental noise and the stel…
Statistical evaluation of the flux cross-calibration of the XMM-Newton EPIC cameras
Read, A. M.; Saxton, R. D.; Mateos, S. +1 more
Context: The second XMM-Newton serendipitous source catalogue, 2XMM, provides the ideal data base for performing a statistical evaluation of the flux cross-calibration of the XMM-Newton European Photon Imaging Cameras (EPIC).
Aims: We aim to evaluate the status of the relative flux calibration of the EPIC cameras on board the XMM-Newton observ…
New estimates of the gamma-ray line emission of the Cygnus region from INTEGRAL/SPI observations
Meynet, G.; Knödlseder, J.; Diehl, R. +1 more
Context: The Cygnus region harbours a huge complex of massive stars at a distance of 1.0-2.0 kpc from us. About 170 O stars are distributed over several OB associations, among which the Cyg OB2 cluster is by far the largest with about 100-120 O stars. As a consequence of their successive nuclear-burning episodes, these massive stars inject large q…
Observation of bipolar moving magnetic features streaming out from a naked spot
Guglielmino, S. L.; Romano, P.; Zuccarello, F. +5 more
Context: Mechanisms responsible for active-region formation, evolution, and decay have been investigated by many authors and several common features have been identified. In particular, a key element in the dispersal of the magnetic field seems to be the presence of magnetic elements, called moving magnetic features (MMFs).
Aims: We analyze th…
Planetary transit candidates in Corot-IRa01 field
Aigrain, S.; Alonso, R.; Barge, P. +35 more
Context: CoRoT is a pioneering space mission devoted to the analysis of stellar variability and the photometric detection of extrasolar planets.
Aims: We present the list of planetary transit candidates detected in the first field observed by CoRoT, IRa01, the initial run toward the Galactic anticenter, which lasted for 60 days.
Methods: W…
Imaging of star clusters in unperturbed spiral galaxies with the Advanced Camera for Surveys. II. A comparison of star cluster systems in five late type spirals
Larsen, S. S.; Kissler-Patig, M.; Richtler, T. +2 more
Aims: Our goal is to investigate the formation of star clusters in relatively unperturbed environments. To do this, we studied the five nearby spiral galaxies: NGC 45, NGC 1313, NGC 4395, NGC 5236, and NGC 7793.
Methods: We obtained images of the galaxies and their star cluster systems in {UBVI} using the Advanced Camera for Surveys (ACS) and …