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XMM-Newton observations of IGR J18410-0535: the ingestion of a clump by a supergiant fast X-ray transient
Campana, S.; Cusumano, G.; Israel, G. +6 more
Context. IGR J18410-0535 is a supergiant fast X-ray transients. This subclass of supergiant X-ray binaries typically undergoes few-hour-long outbursts reaching luminosities of 1036-1037 erg s-1, the occurrence of which has been ascribed to the combined effect of the intense magnetic field and rotation of the compac…
About the p-mode frequency shifts in HD 49933
García, R. A.; Mathur, S.; Ballot, J. +2 more
We study the frequency dependence of the frequency shifts of the low-degree p modes measured in the F5V star HD 49933, by analyzing the second run of observations collected by the CoRoT satellite. The 137-day light curve is divided into two subseries corresponding to periods of low and high stellar activity. The activity-frequency relationship is …
1ES 0229+200: an extreme blazar with a very high minimum Lorentz factor
Tibolla, O.; Hauser, M.; Wagner, S. J. +1 more
The blazar 1ES 0229+200 is a high-frequency-peaked BL Lac object with a hard TeV spectrum extending to 10TeV. Its unusual spectral characteristics make it a frequently used probe for intergalactic radiation and magnetic fields. With new, simultaneous observations in the optical, ultraviolet (UV), and X-rays, the synchrotron emission is probed in g…
Far-infrared to millimeter astrophysical dust emission. II. Comparison of the two-level systems (TLS) model with astronomical data
Bernard, J. -P.; Paradis, D.; Mény, C. +1 more
Aims: In a previous paper we proposed a new model for the emission by amorphous astronomical dust grains, based on solid-state physics. The model uses a description of the disordered charge distribution (DCD) combined with the presence of two-level systems (TLS) defects in the amorphous solid composing the grains. The goal of this paper is to…
The broad iron Kα line of Cygnus X-1 as seen by XMM-Newton in the EPIC-pn modified timing mode
Reynolds, C. S.; Nowak, M. A.; Dauser, T. +7 more
We present the analysis of the broadened, flourescent iron Kα line in simultaneous XMM-Newton and RXTE data from the black hole Cygnus X-1. The XMM-Newton data were taken in a modified version of the timing mode of the EPIC-pn camera. In this mode the lower energy threshold of the instrument is increased to 2.8 keV to avoid telemetry drop outs due…
Back and forth from cool core to non-cool core: clues from radio halos
Rossetti, M.; Molendi, S.; Gastaldello, F. +3 more
X-ray astronomers often divide galaxy clusters into two classes: "cool core" (CC) and "non-cool core" (NCC) objects. The origin of this dichotomy has been the subject of debate in recent years, between "evolutionary" models (where clusters can evolve from CC to NCC, mainly through mergers) and "primordial" models (where the state of the cluster is…
Multiwavelength campaign on Mrk 509. VI. HST/COS observations of the far-ultraviolet spectrum
Kaastra, J. S.; Kriss, G. A.; Arav, N. +15 more
We present medium-resolution (λ/Δλ ~ 20 000) ultraviolet spectra covering the 1155-1760 Å spectral range of the Seyfert 1 galaxy
Phase-resolved spectroscopic study of the isolated neutron star RBS 1223 (1RXS J130848.6+212708)
Werner, K.; Neuhäuser, R.; Schwope, A. D. +3 more
Aims: We constrain the mass-to-radius ratio of isolated neutron stars by performing a spin-phase resolved X-ray spectroscopic analysis.
Methods: We combined the data from all observations of RBS 1223 (1RXS J130848.6+212708) conducted by XMM-Newton EPIC pn with the same instrumental setup in 2003-2007 to form spin-phase resolved spectra. …
A Herschel resolved far-infrared dust ring around HD 207129
Fridlund, M.; Krivov, A. V.; Eiroa, C. +26 more
Context. Dusty debris discs around main sequence stars are thought to be the result of continuous collisional grinding of planetesimals in the system. The majority of these systems are unresolved and analysis of the dust properties is limited by the lack of information regarding the dust location.
Aims: The Herschel DUNES key program is obser…
Transiting exoplanets from the CoRoT space mission. XVIII. CoRoT-18b: a massive hot Jupiter on a prograde, nearly aligned orbit
Mazeh, T.; Aigrain, S.; Alonso, R. +44 more
We report the detection of CoRoT-18b, a massive hot Jupiter transiting in front of its host star with a period of 1.9000693 ± 0.0000028 days. This planet was discovered thanks to photometric data secured with the CoRoT satellite combined with spectroscopic and photometric ground-based follow-up observations. The planet has a mass Mp = 3…