Search Publications
WEBT multiwavelength monitoring and XMM-Newton observations of BL Lacertae in 2007-2008. Unveiling different emission components
Lee, C. -U.; Lähteenmäki, A.; Umana, G. +66 more
Context: BL Lacertae is the prototype of the blazar subclass named after it. Yet, it has occasionally shown a peculiar behaviour that has questioned a simple interpretation of its broad-band emission in terms of synchrotron plus synchrotron self-Compton (SSC) radiation.
Aims: In the 2007-2008 observing season we carried out a new multiwaveleng…
Gravitational potential and X-ray luminosities of early-type galaxies observed with XMM-Newton and Chandra
Matsushita, K.; Nagino, R.
Aims: We study the dark matter content in early-type galaxies and investigate whether X-ray luminosities of early-type galaxies are determined by the surrounding gravitational potential.
Methods: We derived gravitational mass profiles of 22 early-type galaxies observed with XMM-Newton and Chandra.
Results: Sixteen galaxies show constant or…
A spectroscopic survey of the youngest field stars in the solar neighbourhood. I. The optically bright sample
Motch, C.; Freire Ferrero, R.; Bouvier, J. +8 more
Aims: We present the first results of an ambitious ground-based observation programme conducted on 1-4 m class telescopes. Our sample consists of 1097 active and presumably young stars, all of them being optical (Tycho Catalogue) counterparts of ROSAT All-Sky Survey X-ray sources in the northern hemisphere. In this paper, we concentrate on the opt…
A new window of exploration in the mass spectrum: strong lensing by galaxy groups in the SL2S
Kneib, J. -P.; Sygnet, J. -F.; Willis, J. +21 more
The existence of strong lensing systems with Einstein radii covering the full mass spectrum, from ∼ 1-2 arcsec (produced by galaxy scale dark matter haloes) to >10 arcsec (produced by galaxy cluster scale haloes) have long been predicted. Many lenses with Einstein radii around 1-2 arcsec and above 10 arcsec have been reported but very few in be…
Searching for massive galaxies at z ≥ 3.5 in GOODS-North
Cimatti, A.; Daddi, E.; Rodighiero, G. +5 more
Aims: We constrain the space density and properties of massive galaxy candidates at redshifts of z≥3.5 in the Great Observatories Origin Deep Survey North (GOODS-N) field. By selecting sources in the Spitzer + IRAC bands, a sample highly complete in stellar-mass is assembled, including massive galaxies that are very faint in the optical/near-IR ba…
A self-consistent stellar and 3D nebular model of planetary nebula IC 418
Morisset, C.; Georgiev, L.
Aims: We present a coherent stellar and nebular model that reproduces observations of the planetary nebula IC 418. We aim to test whether a stellar model found to provide an optimal description of the stellar observations is able to satisfactory ionize the nebula and reproduce the nebular observations, a finding that is by no mean evident. This al…
Intermediate polars in the Swift/BAT survey: spectra and white dwarf masses
Greiner, J.; Ajello, M.; Osborne, J. +1 more
Context: White dwarf masses in cataclysmic variables are difficult to determine accurately, but are fundamental for understanding binary system parameters, as well as binary evolution.
Aims: We investigate the X-ray spectral properties of a sample of Intermediate Polars (IP) detected above 15 keV to derive the masses of their accreting white d…
The secondary eclipse of the transiting exoplanet CoRoT-2b
Mazeh, T.; Aigrain, S.; Alapini, A. +5 more
We present a study of the light curve of the transiting exoplanet CoRoT-2b, aimed at detecting the secondary eclipse and measuring its depth. The data were obtained with the CoRoT satellite during its first run of more than 140 days. After filtering the low frequencies with a pre-whitening technique, we detect a 0.0060±0.0020% secondary eclipse ce…
Thermal emission, shock modification, and X-ray emitting ejecta in SN 1006
Miceli, M.; Bocchino, F.; Orlando, S. +6 more
Context: Efficient particle acceleration can modify the structure of supernova remnants. We present the results of a combined analysis of the XMM-Newton EPIC archive observations of SN 1006.
Aims: We attempt to describe the spatial distribution of the physical and chemical properties of the X-ray emitting plasma at the shock front. We investig…
From outburst to quiescence: the decay of the transient AXP XTE J1810-197
Campana, S.; Tiengo, A.; Götz, D. +10 more
Aims: XTE J1810-197 is the first transient anomalous X-ray pulsar ever discovered. Its highly variable X-ray flux allowed us to study the timing and spectral emission properties of a magnetar candidate over a flux range of about two orders of magnitude.
Methods: We analyzed nine XMM-Newton observations of XTE J1810-197 collected over a four ye…