Search Publications
A study of the Martian water vapor over Hellas using OMEGA and PFS aboard Mars Express
Bibring, J. -P.; Gondet, B.; Langevin, Y. +8 more
We used the OMEGA imaging spectrometer aboard Mars Express to study the evolution of the water vapor abundance over the Hellas basin, as a function of the seasonal cycle. The H2O column density is found to range from very low values (between southern fall and winter) up to more than 15 pr-µm during southern spring and summer. The general beh…
Detection of a hot intergalactic medium in the spiral-only compact group SCG0018-4854
Reeves, J.; Trinchieri, G.; Iovino, A. +4 more
Aims: Compact groups of galaxies are excellent laboratories for studying galaxy interactions and their effects on the evolution of galaxies. In particular, dynamically young systems, with a large fraction of interacting, late type galaxies, have so far escaped proper studies in the X-ray band and their hot intergalactic medium properties are virtu…
Kinematics and H{2} morphology of the multipolar post-AGB star IRAS 16594-4656
van Hoof, P. A. M.; Ueta, T.; Reyniers, M. +2 more
Context: The spectrum of IRAS 16594-4656 shows shock-excited H2 emission and collisionally excited emission lines such as [O i], [C i], and [Fe ii].
Aims: The goal is to determine the location of the H2 and [Fe ii] shock emission, to determine the shock velocities, and to constrain the physical properties in the shock.
Methods: High resolu…
XMM-Newton observations of the Small Magellanic Cloud: RX J0105.9-7203, a 726 s Be/X-ray binary pulsar
Haberl, F.; Eger, P.
Aims: To investigate the Be/X-ray binary candidate RX J0105.9-7203 in the Small Magellanic Cloud (SMC), we analysed twenty-two archival XMM-Newton observations around the calibration target 1E 0102.2-7218.
Methods: We performed spectral and temporal analyses on the EPIC data of fifteen observations. We disregarded the data of one observation d…
A new search strategy for microquasar candidates using NVSS/2MASS and XMM-Newton data
Combi, J. A.; Martí, J.; Albacete-Colombo, J. F.
Aims:Microquasars are ideal natural laboratories for understanding accretion/ejection processes, studying the physics of relativistic jets, and testing gravitational phenomena. Nevertheless, these objects are difficult to find in our Galaxy. The main goal of this work is to increase the number of known systems of this kind, which should allow bett…
The properties of the putative pulsar associated with IGR J18135-1751/HESS J1813-178
Hill, A. B.; Dean, A. J.
Context: We investigate the possible theoretical properties of the putative pulsar associated with the pulsar wind nebula IGR J18135-1751/HESS J1813-178 based upon recent γ-ray observations and archival multi-wavelength observations.
Aims: We show that when using the standard equations for magnetic dipole radiation with recent soft γ-ray obser…
Quasar host galaxies in the FORS deep field
Nilsson, K.; Villforth, C.; Heidt, J.
Context: The evolution of quasar host galaxies is still hardly studied at high redshifts (z>2), although this is a very interesting redshift range as both the quasar activity and the star formation rate density have their peak at z≈ 2{-}3. This makes it especially interesting to study properties of quasar host galaxies, such as the star formati…
The enigmatic young object: Walker 90/V590 Monocerotis
McCollum, B.; van den Ancker, M. E.; Joner, M. D. +1 more
Aims: We assess the evolutionary status of the intriguing object Walker 90/V590 Mon, which is located about 20 arcmin northwest of the Cone Nebula near the center of the open cluster NGC 2264. This object, according to its most recent optical spectral type determination (B7), which we confirmed, is at least 3 mag too faint in V for the cluster dis…
XMM-Newton observations of the low-mass X-ray binary XB 1832-330 in the galactic globular cluster NGC 6652
Parmar, A. N.; Sidoli, L.; La Palombara, N. +1 more
Context: We report on two XMM-Newton observations performed in 2006 of the luminous low-mass X-ray binary XB 1832-330, which is located in the galactic globular cluster NGC 6652 and is probably an ultracompact binary (orbital period, P_orb, of <1 h).
Aims: The aim of these observations is to investigate the low-energy absorption towards XB …
Diagnostics of inhomogeneous stellar jets. Convolution effects and data reconstruction
Raga, A. C.; Del Burgo, C.; de Colle, F.
Context: In the interpretation of stellar jet observations, the physical parameters are usually determined from emission line ratios, obtained from spectroscopic observations or using the information contained in narrow band images. The basic hypothesis in the interpretation of the observations is that the emitting region is homogeneous along the …