Search Publications
Indications for 3 Mpc-scale large-scale structure associated with an X-ray luminous cluster of galaxies at z = 0.95
Böhringer, H.; Rosati, P.; Schwope, A. +5 more
Context: X-ray luminous clusters of galaxies at z ~ 1 are emerging as major cosmological probes and are fundamental tools to study the cosmic large-scale structure and environmental effects of galaxy evolution at large look-back times.
Aims: We present details of the newly-discovered galaxy cluster XMMU J0104.4-0630 at z = 0.947 and a probable…
Influence of Compton scattering on the broad-band X-ray spectra of intermediate polars
Werner, K.; Poutanen, J.; Falanga, M. +1 more
Context: The majority of cataclysmic variables observed in the hard X-ray energy band are intermediate polars where the magnetic field is strong enough to channel the accreting matter to the magnetic poles of the white dwarf. A shock above the stellar surface heats the gas to fairly high temperatures (10-100 keV). The post-shock region cools mostl…
The nearest X-ray emitting protostellar jet (HH 154) observed with Hubble
Liseau, R.; Micela, G.; Bonito, R. +4 more
Context: The jet coming from the YSO binary
Asiago eclipsing binaries program. III. V570 Persei
Munari, U.; Zwitter, T.; Sordo, R. +4 more
The orbit and physical parameters of the previously unsolved double-lined eclipsing binary V570 Per, discovered by the Hipparcos satellite, were derived using high-resolution Echelle spectroscopy and B, V photoelectric photometry. The metallicity from χ2 analysis of the spectra is [ M/H]=+0.02±0.03, and reddening from interstellar NaI a…
Line intensity enhancements in stellar coronal X-ray spectra due to opacity effects
Mathioudakis, M.; Keenan, F. P.; Matranga, M. +2 more
Context: The I(15.01 Å)/I(16.78 Å) emission line intensity ratio in Fe xvii has been reported to deviate from its theoretical value in solar and stellar X-ray spectra. This is attributed to opacity in the 15.01 Å line, leading to a reduction in its intensity, and was interpreted in terms of a geometry in which the emitters and absorbers are spatia…
Phase-dependent X-ray observations of the β Lyrae system. No eclipse in the soft band
Hamann, W. -R.; Oskinova, L. M.; Ignace, R. +2 more
Aims:We report on observations of the eclipsing and interacting binary β Lyrae from the Suzaku X-ray telescope. This system involves an early B star embedded in an optically and geometrically thick disk that is siphoning atmospheric gases from a less massive late B II companion.
Methods: Motivated by an unpublished X-ray spectrum from the Eins…
Prominence modelling: from observed emission measures to temperature profiles
Heinzel, P.; Anzer, U.
Aims:We outline the construction of prominence - corona transition region models based upon the observations of one particular prominence.
Methods: The differential emission measure curves from observations were approximated by simple analytical functions. On this basis we constructed the temperature curve and calculated the radiative losses, …
Quiescent X-ray emission from the M9 dwarf LHS 2065
Schmitt, J. H. M. M.; Robrade, J.
Aims: X-ray emission is an important diagnostics to study magnetic activity in very low mass stars that are presumably fully convective and have an effectively neutral photosphere.
Methods: We investigate an archival XMM-Newton observation of LHS 2065, an ultracool dwarf with spectral type M9.
Results: We clearly detect LHS 2065 at soft X-…
INTEGRAL observation of the accreting pulsar 1E1145.1-6141
Santangelo, A.; Segreto, A.; Ferrigno, C. +2 more
Aims: We analyze 1050 ks of INTEGRAL data of the high mass X-ray binary pulsar 1E 1145.1-6141 to study its properties over a long time baseline, from June 2003 to June 2004, with wide spectral coverage.
Methods: We study three high luminosity episodes, two of them at the system apoastron, three brightening with lower intensity, two at the peri…
Internal kinematics of spiral galaxies in distant clusters. III. Velocity fields from FORS2/MXU spectroscopy
Böhm, A.; Peletier, R. F.; Kuntschner, H. +8 more
Context: We continue our investigation on how the cluster environment affects the evolution of galaxies.
Aims: By examining both galaxy structure and internal kinematics of cluster galaxies at lookback times of ~5 Gyr we study the nature and impact of possible interactions at the peak epoch of cluster assembly.
Methods: Going beyond our pr…