Search Publications
Slit and integral-field optical spectroscopy of the enigmatic quasar HE 0450-2958
Magain, P.; Courbin, F.; Letawe, G.
Context: Interest in the quasar HE 0450-2958 arose following the publication of the non-detection of its expected massive host, leading to various interpretations.
Aims: This article investigates the gaseous and stellar contents of the system through additional VLT/FORS slit spectra and integral field spectroscopy from VLT/VIMOS.
Methods: …
The dynamical state of A548 from XMM-Newton data: X-ray and radio connection
Teyssier, R.; Govoni, F.; Giovannini, G. +5 more
Context: We present a detailed study of the X-ray properties of the galaxy cluster Abell 548b (z = 0.04), using XMM-Newton data, and discuss the connection between the thermal properties and the presence of two extended relic radio sources located at the cluster periphery.
Aims: We wish to analyze the dynamical state of the cluster and confirm…
Shock-related radio emission during coronal mass ejection lift-off?
Pohjolainen, S.
Aims: We identify the source of fast-drifting decimetric-metric radio emission that is sometimes observed prior to the so-called flare continuum emission. Fast-drift structures and continuum bursts are also observed in association with coronal mass ejections (CMEs), not only flares.
Methods: We analyse radio spectral features and images acquir…
XMM-Newton observations of the Small Magellanic Cloud: X-ray outburst of the 6.85 s pulsar XTE J0103-728
Pietsch, W.; Haberl, F.
Context: A bright X-ray transient was seen during an XMM-Newton observation in the direction of the Small Magellanic Cloud (SMC) in October 2006.
Aims: The data from the European Photon Imaging Cameras (EPIC) allow us to accurately locate the source and to investigate its temporal and spectral behaviour.
Methods: We extracted X-ray spectra…
VLA and Effelsberg observations of the interstellar medium around the runaway star WR 124
Cichowolski, S.; Pineault, S.; Arnal, E. M. +1 more
Aims:We present very large array (VLA) and Effelsberg radio continuum and 21 cm H I line observations of the interstellar medium (ISM) surrounding the runaway star WR 124 and the nebula M 1-67. The H I data have been used to investigate the effects that a star with a strong stellar wind and a high peculiar velocity has on the ISM.
Methods: The…
Analysis and interpretation of a fast limb CME with eruptive prominence, C-flare, and EUV dimming
Filippov, B.; Koutchmy, S.; Golub, L. +3 more
Aims: Coronal mass ejections or CMEs are large dynamical solar-corona events. The mass balance and kinematics of a fast limb CME, including its prominence progenitor and the associated flare, will be compared with computed magnetic structures to look for their origin and effect.
Methods: Multi-wavelength ground-based and spaceborne observation…
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…