Search Publications
An integral field spectroscopic survey for high redshift damped Lyman-α galaxies
Jahnke, K.; Christensen, L.; Kelz, A. +3 more
Aims:We search for galaxy counterparts to damped Lyman-α absorbers (DLAs) at z > 2 towards nine quasars, which have 14 DLAs and 8 sub-DLAs in their spectra.
Methods: We use integral field spectroscopy to search for Lyα emission line objects at the redshifts of the absorption systems.
Results: Besides recovering two previously confirmed …
Clathrate hydrates as a sink of noble gases in Titan's atmosphere
Mousis, O.; Thomas, C.; Picaud, S. +1 more
We use a statistical thermodynamic approach to determine the composition of clathrate hydrates which may form from a multiple compound gas whose composition is similar to that of Titan's atmosphere. Assuming that noble gases are initially present in this gas phase, we calculate the ratios of xenon, krypton and argon to species trapped in clathrate…
XMM-Newton observation of the persistent Be/neutron star system X Persei at a high-luminosity level
Mereghetti, S.; La Palombara, N.
We report on the XMM-Newton observation of the HMXRB X Persei, the prototype of the persistent and low-luminosity Be/neutron star pulsars, which was performed in February 2003. The source was detected at a luminosity level of ~1.4×1035 erg s-1, which is the highest level of the latest three decades. The pulsation period has i…
Obscured and unobscured AGN populations in a hard-X-ray selected sample of the XMDS survey
Maccagni, D.; Maraschi, L.; Chiappetti, L. +16 more
Aims:Our goal is to probe the populations of obscured and unobscured AGN investigating their optical-IR and X-ray properties as a function of X-ray flux, luminosity and redshift within a hard X-ray selected sample with wide multiwavelength coverage.
Methods: We selected a sample of 136 X-ray sources detected at a significance of ≥3 σ in the 2{…
SGR 1806-20 about two years after the giant flare: Suzaku, XMM-Newton and INTEGRAL observations
Tiengo, A.; Götz, D.; Mereghetti, S. +9 more
In December 2004, the soft gamma-ray repeater SGR 1806-20 emitted the most powerful giant flare ever observed. This probably involved a large-scale rearrangement of the magnetosphere leading to observable variations in the properties of its X-ray emission. Here we present the results of the first Suzaku observation of SGR 1806-20, together with al…
The infrared compactness-temperature relation for quiescent and starburst galaxies
Elbaz, D.; Chanial, P.; Vigroux, L. +3 more
Context: IRAS observations show the existence of a correlation between the infrared luminosity L_IR and dust temperature Td in star-forming galaxies, in which larger L_IR leads to higher dust temperature. The L_IR -Td relation is commonly seen as reflecting the increase in dust temperature in galaxies with higher star formati…
HST/ACS observations of shell galaxies: inner shells, shell colours and dust
Peletier, R. F.; Balcells, M.; Valentijn, E. A. +3 more
Context: Shells in Elliptical Galaxies are faint, sharp-edged features, believed to provide evidence for a merger event. Accurate photometry at high spatial resolution is needed to learn on presence of inner shells, population properties of shells, and dust in shell galaxies.
Aims: Learn more about the origin of shells and dust in early type g…
Spectral shape of the UV ionizing background and He II absorption at redshifts 1.8 < z < 2.9
Reimers, D.; Levshakov, S. A.; Agafonova, I. I. +4 more
Aims:The shape of the UV ionizing background is reconstructed from optically thin metal absorption-line systems identified in spectra of
Methods: The systems are analyzed by means of the Monte Carlo…
The cooling of atomic and molecular gas in DR21
Schneider, N.; Ossenkopf, V.; Bontemps, S. +5 more
Aims: We present an overview of a high-mass star formation region through the major (sub-)mm, and far-infrared cooling lines to gain insight into the physical conditions and the energy budget of the molecular cloud.
Methods: We used the KOSMA 3 m telescope to map the core (10'× 14') of the Galactic star-forming region DR21/DR21 (OH) in the Cyg…
X-ray emission from the young brown dwarfs of the Taurus molecular cloud
Ménard, F.; Audard, M.; Güdel, M. +9 more
Aims:We report the X-ray properties of young (~3 Myr) bona fide brown dwarfs of the Taurus Molecular Cloud (TMC).
Methods: The XMM-Newton Extended Survey of the TMC (XEST) is a large program designed to systematically investigate the X-ray properties of young stellar/substellar objects in the TMC. In particular, the area surveyed by 15 XMM-New…