Search Publications
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…
The spatial clustering of mid-IR selected star forming galaxies at z ~ 1 in the GOODS fields
Daddi, E.; Elbaz, D.; Stern, D. +6 more
We present the first spatial clustering measurements of z∼1, 24 µm-selected, star forming galaxies in the Great Observatories Origins Deep Survey (GOODS). The sample under investigation includes 495 objects in GOODS-South and 811 objects in GOODS-North selected down to flux densities of f24>20 µJy and z_AB<23.5 mag, fo…
The gaseous atmosphere of M 87 seen with XMM-Newton
Finoguenov, A.; Böhringer, H.; Simionescu, A. +1 more
Aims:M 87 is a key object whose study can reveal the complex phenomena in cooling cores. We use a deep XMM-Newton observation of M 87 to produce detailed temperature, pressure and entropy maps in order to analyze the physical processes of cooling cores and of their heating mechanisms.
Methods: We employed both broad-band fitting and full spect…