Search Publications
Galactic X-ray source populations
Motch, C.
The landscape of Galactic X-ray sources made of accreting binaries, isolated objects and active stellar coronae has been significantly modified by the advent of the Chandra, XMM-Newton and INTEGRAL satellites. New types of relatively low X-ray luminosity X-ray binaries have been unveiled in the Galactic disc, while deep observations of the central…
Young star clusters in the Antennae galaxies and NGC 1487
Lehnert, M. D.; Vacca, W. D.; Chandar, R. +3 more
We estimate the dynamical masses of several young ({≈ 10} Myr) massive star clusters in two interacting galaxies, NGC 4038/4039 (``The Antennae") and NGC 1487, under the assumption of virial equilibrium. These are compared with photometric mass estimates. A dynamical mass substantially higher than the photometric estimate could indicate non-virial…
Doing physics in star-forming regions with XMM-Newton
Montmerle, T.
Star-forming regions have been observed in X-rays since the first generation of satellites in the late 70s. They are very rich in magnetically-controlled X-ray phenomena: stellar flares and star-disk interactions in hundreds of T Tauri stars, confined winds in massive stars, etc. More recently, in a few low-mass stars, X-ray evidence has been foun…
``Resolving" neutron stars physics and geometry
Caraveo, P. A.
The unprecedented harvest of X-ray photons detected from dozens of isolated neutron stars has made it possible to glimpse at their emission mechanisms as well as at their emission geometry. Rotating hot spot(s), superimposed to the global thermal emission from the neutron star surface, are seen from several objects, allowing to probe the stars' ex…
X-Ray observations of the Galactic Centre with Suzaku
Koyama, K.; Nobukawa, M.; Mori, H. +2 more
We report on the diffuse X-ray emission from the Galactic Centre (GCDX) observed with the X-ray Imaging Spectrometer (XIS) on board the Suzaku satellite. The highly accurate energy calibration and extremely low background of the XIS provide many new facts on the GCDX. These are (1) the origin of the lines at 6.7 and 7.0 keV is collisional excitati…
XMM-Newton: The next decade for cool star research
Schmitt, J. H. M. M.
In this article I will highlight selected results from XMM-Newton observations of stellar coronae, emphasizing the specific XMM-Newton capabilities in terms of high-resolution spectroscopy, its long-look capability and its optical monitor. I will focus on results on ``normal", cool stars and present science areas hitherto largely unexploired by XM…
The XMM-Newton view of magnetars
Tiengo, A.; Mereghetti, S.; Esposito, P.
Anomalous X-ray Pulsars and Soft Gamma-ray Repeaters are believed to be magnetars: isolated neutron stars powered by the decay of extremely high magnetic fields. We review some of the main results obtained with \xmm and discuss the prospects for future observations of this small but extremely interesting class of objects.
Local Galactic kinematics from revised Hipparcos catalogue
Zhu, Z.; Yuan, F. -T.; Kong, D. -L.
Local stellar kinematic properties are reinvestigated. A main-sequence sample of 12718 objects is picked out from a total of 117955 Hipparcos stars and some local kinematical parameters are re-determined by dividing 19 subsamples mainly according to color index. The results are reasonably consistent with those derived from the initial Hipparcos da…