Search Publications
Bimodal spectral variability of Cygnus X-1 in an intermediate state
Belloni, T.; Chaty, S.; Rodriguez, J. +11 more
We report the results of an observation of
Solar coronal-hole plasma densities and temperatures
Wilhelm, K.
Polar plumes extending from the Sun into the solar corona have long been seen during eclipses, and can now be studied without this restriction with telescopes and spectrometers on board of spacecraft. Despite the large amount of observational data available on this prominent phenomenon, it is not clear whether plumes contribute substantially to th…
Mid infrared properties of distant infrared luminous galaxies
Elbaz, D.; Morrison, G.; Dickinson, M. +3 more
We present evidence that the mid infrared (MIR, rest frame 5-30 µm) is a good tracer of the total infrared luminosity, L(IR)(=L[8{-}1000 µm]), and star formation rate (SFR), of galaxies up to z∼ 1.3. We use deep MIR images from the Infrared Space Observatory (ISO) and the Spitzer Space Telescope in the Northern field of the Great Obser…
The radio to TeV orbital variability of the microquasar LS I +61 303
Paredes, J. M.; Romero, G. E.; Ribó, M. +1 more
Context: .The microquasar LS I +61 303 has recently been detected at TeV energies by the Cherenkov telescope MAGIC, presenting variability on timescales similar to its orbital period. This system has been intensively observed at different wavelengths during the last three decades, showing a very complex behavior along the orbit.
Aims: .We aim …
Comparing dynamical and photometric-stellar masses of early-type galaxies at z ~ 1
Cimatti, A.; Popesso, P.; Stern, D. +13 more
Aims.The purpose of this study is to explore the relationship between galaxy stellar masses, based on multiwavelength photometry spectral template fitting and dynamical masses based on published velocity dispersion measurements, for a sample of 48 early-type galaxies at z ∼ 1 with HST/ACS morphological information.
Methods: .We determine photo…
Evidence for orbital motion of material close to the central black hole of Mrk 766
Turner, T. J.; Reeves, J. N.; George, I. M. +1 more
Time-resolved X-ray spectroscopy has been obtained for the narrow line Seyfert galaxy Mrk 766 from XMM-Newton observations. We present analysis in the energy-time plane of EPIC pn data in the 4-8 keV band with energy resolution R ≃ 50. A component of Fe Kα emission detected in the maps shows a variation of photon energy with time that appears both…
Simultaneous X-ray and optical observations of S5 0716+714 after the outburst of March 2004
Maraschi, L.; Tagliaferri, G.; Ghisellini, G. +6 more
At the end of March 2004, the blazar S5 0716+714 underwent an optical outburst that prompted for quasi-simultaneous target-of-opportunity observations with the INTEGRAL and XMM-Newton satellites. In this paper, we report the results of the XMM-Newton and INTEGRAL OMC data analysis. The X-ray spectrum is well-represented by a concave broken power-l…
Tracing baryons in the warm-hot intergalactic medium with broad Ly α absorption
Savage, B. D.; Sembach, K. R.; Richter, P. +1 more
We discuss physical properties and baryonic content of broad Ly α absorbers (BLAs) at low redshift. These absorption systems, recently discovered in high-resolution, high-signal to noise quasar absorption line spectra, possibly trace the warm-hot intergalactic medium (WHIM) in the temperature range between 105 and 106 K. The …
XMM-Newton observation of a spectral state transition in the peculiar radio/X-ray/γ-ray source LS I +61 303
Mereghetti, S.; Sidoli, L.; Pellizzoni, A. +3 more
We report the results of XMM-Newton and BeppoSAX observations of the radio and X-ray emitting star LS I +61 303, likely associated with the gamma-ray source 2CG 135+01 and recently detected also at TeV energies. The data include a long XMM-Newton pointing carried out in January 2005, which provides the deepest look ever obtained for this object in…
The X-ray emission of the supernova remnant W49B observed with XMM-Newton
Ballet, J.; Miceli, M.; Bocchino, F. +4 more
Context.In the framework of the study of supernova remnants and their complex interaction with the interstellar medium, we report on an XMM-Newton EPIC observation of the Galactic supernova remnant W49B.
Aims.We investigated the spatial distribution of the chemical and physical properties of the plasma, so as to get important constraints on the…