Search Publications
The XMM deep survey in the CDF-S. III. Point source catalogue and number counts in the hard X-rays
Brandt, W. N.; Vignali, C.; Gilli, R. +10 more
Nuclear obscuration plays a key role in the initial phases of AGN growth, yet not many highly obscured active galactic nuclei (AGN) are currently known beyond the local Universe, and their search is an active topic of research. The XMM-Newton survey in the Chandra Deep Field South (XMM-CDFS) aims at detecting and studying the spectral properties o…
Gamma-ray burst optical light-curve zoo: comparison with X-ray observations
Chincarini, G.; Bernardini, M. G.; Margutti, R. +2 more
Aims: We present a comprehensive analysis of the optical and X-ray light curves (LCs) and spectral energy distributions (SEDs) of a large sample of gamma-ray burst (GRB) afterglows to investigate the relationship between the optical and X-ray emission after the prompt phase. We consider all data available in the literature, which where obtain…
Intensity contrast of solar network and faculae
Solanki, S. K.; Yeo, K. L.; Krivova, N. A.
Aims: This study aims at setting observational constraints on the continuum and line core intensity contrast of network and faculae, specifically, their relationship with magnetic field and disc position.
Methods: Full-disc magnetograms and intensity images by the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observat…
Infrared identification of high-mass X-ray binaries discovered by INTEGRAL
Chaty, S.; Rahoui, F.; Tomsick, J. A. +2 more
Context. Since it started observing the sky, the INTEGRAL satellite has discovered new categories of high mass X-ray binaries (HMXB) in our Galaxy. These observations raise important questions on the formation and evolution of these rare and short-lived objects.
Aims: We present here new infrared observations from which to reveal or constrain…
The Herschel Virgo Cluster Survey. XIII. Dust in early-type galaxies
Bianchi, S.; Fritz, J.; De Looze, I. +16 more
Aims: We study the dust content of a large optical input sample of 910 early-type galaxies (ETG) in the Virgo cluster, also extending to the dwarf ETG, and examine the results in relation to those on the other cold ISM components.
Methods: We have searched for far-infrared emission in all galaxies in the input sample using the 250 µ…
Low frequency follow up of radio haloes and relics in the GMRT Radio Halo Cluster Survey
Brunetti, G.; Giacintucci, S.; Venturi, T. +4 more
Aims: To gain insight into the origin of diffuse radio sources in galaxy clusters and their connection with cluster merger processes, we performed GMRT low frequency observations of the radio haloes, relics and new candidates belonging to the GMRT radio Halo cluster sample first observed at 610 MHz. Our main aim was to investigate their obser…
The extended ROSAT-ESO flux limited X-ray galaxy cluster survey (REFLEX II) II. Construction and properties of the survey
Böhringer, H.; Nowak, N.; Chon, G. +3 more
Context. Galaxy clusters provide unique laboratories to study astrophysical processes on large scales and are important probes for cosmology. X-ray observations are currently the best means of detecting and characterizing galaxy clusters. Therefore X-ray surveys for galaxy clusters are one of the best ways to obtain a statistical census of the gal…
Deep observations of O2 toward a low-mass protostar with Herschel-HIFI
Caselli, Paola; van Dishoeck, Ewine F.; Visser, Ruud +13 more
Context. According to traditional gas-phase chemical models, O2 should be abundant in molecular clouds, but until recently, attempts to detect interstellar O2 line emission with ground- and space-based observatories have failed.
Aims: Following the multi-line detections of O2 with low abundances in the Orion a…
Analysis of far-UV data of central stars of planetary nebulae: Occurrence and variability of stellar winds
Guerrero, M. A.; De Marco, O.
The occurrence of stellar wind in the central star of a planetary nebula (CSPN) can be revealed by the presence of P Cygni profiles of high-excitation lines overimposed on its stellar continuum. We examined the entire Far-Ultraviolet Spectroscopic Explorer (FUSE) archive and merged all useful spectroscopic observations of CSPNe to produce the high…
Water in star-forming regions with Herschel (WISH). IV. A survey of low-J H2O line profiles toward high-mass protostars
Liseau, R.; van Dishoeck, E. F.; Bergin, E. A. +12 more
Context. Water is a key constituent of star-forming matter, but the origin of its line emission and absorption during high-mass star formation is not well understood.
Aims: We study the velocity profiles of low-excitation H2O lines toward 19 high-mass star-forming regions and search for trends with luminosity, mass, and evolutionar…