Search Publications
The broad-band XMM-Newton and INTEGRAL spectra of bright type 1 Seyfert galaxies
de Rosa, A.; Walter, R.; Bird, A. J. +7 more
Aims: The 0.5-150 keV broad-band spectra of a sample of nine bright type 1 Seyfert galaxies are analyzed here. These sources have been discovered/detected by INTEGRAL and subsequently observed with XMM-Newton for the first time with high sensitivity below 10 keV. The sample, although small, is representative of the population of type 1 AGN which a…
INTEGRAL observations of Hercules X-1
Tsygankov, S.; Klochkov, D.; Santangelo, A. +6 more
Aims: We investigate the X-ray spectral and timing properties of the accreting X-ray pulsar Her X-1 observed with the INTEGRAL satellite in July-August 2005.
Methods: The data analyzed in this work cover a substantial part of one main-on state of the source. The short time scale pulse period development is measured. X-ray pulse profiles for di…
Suzaku broad-band spectroscopy of RX J1347.5-1145: constraints on the extremely hot gas and non-thermal emission
Yoshikawa, K.; Ota, N.; Komatsu, E. +6 more
Context: We present the results of our analysis of long Suzaku observations (149 ks and 122 ks for XIS and HXD, respectively) of the most X-ray luminous galaxy cluster, RX J1347.5-1145, at z=0.451.
Aims: To understand the gas physics of a violent, cluster merger, we study physical properties of the hot ( 20 keV) gas clump in the south-east (SE…
1RXS J173021.5-055933: a cataclysmic variable with a fast-spinning magnetic white dwarf
Mukai, K.; Haberl, F.; Gänsicke, B. T. +8 more
Aims:We present the first X-ray observations with the XMM-Newton and INTEGRAL satellites of the recently discovered cataclysmic variable 1RXS J173021.5-055933, together with simultaneous UV and coordinated optical photometry aiming at characterising its broad-band temporal and spectral properties and classifying this system as a magnetic one.
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Young stars and brown dwarfs surrounding Alnilam (ɛ Orionis) and Mintaka (δ Orionis)
Caballero, J. A.; Solano, E.
Aims: We look for new regions to search for substellar objects.
Methods: Two circular areas, 45 arcmin-radius each, centred on the young massive star systems Alnilam and Mintaka in the Orion Belt, were explored. The regions are very young (less than 10 Ma), have low extinction, and are neighbours to σ Orionis (~3 Ma), a young open cluster very…
Hadronic versus leptonic origin of the gamma-ray emission from supernova remnant RX J1713.7-3946
Völk, H. J.; Berezhko, E. G.
Aims: The hadronic vs. leptonic origin of the gamma-ray emission from the Supernova Remnant RX J1713.7-3946 is discussed both in the light of new observations and from a theoretical point of view.
Methods: The existing good spatial correlation of the gamma-ray emission and the nonthermal X-ray emission is analyzed theoretically. In addition, t…
Average Fe Kα emission from distant AGN
Ebrero, J.; Page, M. J.; Barcons, X. +7 more
Context: One of the most important parameters in the XRB (X-ray background) synthesis models is the average efficiency of accretion onto SMBH (super-massive black holes). This can be inferred from the shape of broad relativistic Fe lines seen in X-ray spectra of AGN (active galactic nuclei). Several studies have tried to measure the mean Fe emissi…
The Ly-α profile and center-to-limb variation of the quiet Sun
Curdt, W.; Teriaca, L.; Tian, H. +2 more
Aims: We study the emission of the hydrogen Lyman-α line in the quiet Sun, its center-to-limb variation, and its radiance distribution. We also compare quasi-simultaneous Ly-α and Ly-β line profiles.
Methods: We used the high spectral and spatial resolution of the SUMER spectrometer and completed raster scans at various locations along the dis…
The long-period Galactic Cepheid RS Puppis. I. A geometric distance from its light echoes
Szabados, L.; Kervella, P.; Bersier, D. +4 more
Context: The bright southern Cepheid RS Pup is surrounded by a circumstellar nebula reflecting the light from the central star. The propagation of the light variations from the Cepheid inside the dusty nebula creates spectacular light echoes that can be observed up to large distances from the star itself. This phenomenon is currently unique in thi…
Dynamics of coronal mass ejections. The mass-scaling of the aerodynamic drag
Vršnak, B.; Vrbanec, D.; Čalogović, J.
Context: Coronal and interplanetary propagation of coronal mass ejections (CMEs) is strongly affected by aerodynamic drag.
Aims: The dependence of the drag acceleration on the mass of the CMEs is investigated to establish a quantitative empirical relationship, which might be important in semi-empirical space-weather forecasting.
Methods: W…