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[CII] emission and star formation in the spiral arms of M 31
Braine, J.; Brouillet, N.; Combes, F. +1 more
Context: .The [Cii] 158 µm line is the most important coolant of the interstellar medium in galaxies but substantial variations are seen from object to object. The main source of the emission at a galactic scale is still poorly understood and candidates range from photodissociation regions (PDRs) to the cold neutral or diffuse warm ionized m…
X-ray and optical bursts and flares in YSOs: results from a 5-day XMM-Newton monitoring campaign of L1551
Micela, G.; Favata, F.; Giardino, G. +3 more
We present the results of a five-day monitoring campaign with XMM-Newton of six X-ray bright young stellar objects (YSOs) in the star-forming complex L1551 in Taurus. All stars present significant variability on the five-day time scale. Modulation of the light curve on time scales comparable with the star's rotational period appeared to be present…
Attempts to measure the magnetic field of the pulsating B star ν Eridani
Neiner, C.; Henrichs, H. F.; Schnerr, R. S. +1 more
We report on attempts to measure the magnetic field of the pulsating B star ν Eridani with the Musicos spectropolarimeter attached to the 2 m telescope at the Pic du Midi, France. This object is one of the most extensively studied stars for pulsation modes, and the existence of a magnetic field was suggested from the inequality of the frequency se…
Line profiles of water for the photon dominated region and embedded sources in the S140 region
Spaans, M.; Poelman, D. R.
H_2O is a key ingredient in many interstellar environments, like photon dominated regions and star forming clouds. It plays an important role in the oxygen chemistry and can act as a coolant in dense interstellar clouds and shocks. Observations and modelling of water lines thus provide powerful diagnostics of the physical conditions in interstella…
Are short γ-ray bursts collimated? GRB 050709, a flare but no break
Sollerman, J.; Watson, D.; Fynbo, J. P. U. +5 more
Context: .From the small sample of afterglow lightcurves of short duration γ-ray bursts (GRBs), the decays are rapid, roughly following a power-law in time. It has been assumed that the afterglow emission in short GRBs is collimated in jets in the same way as in long GRBs.
Aims: .An achromatic break in a short GRB afterglow lightcurve would th…
Stellar populations in the CFHTLS. I. New constraints on the IMF at low mass
Schultheis, M.; Bertin, E.; McCracken, H. J. +4 more
We present a stellar populations analysis of the first release of the CFHTLS (Canada-France-Hawai Telescope Legacy Survey) data. A detailed comparison between the Besançon model of the Galaxy and the first data release of the CFHTLS-Deep survey is performed by implementing the MEGACAM photometric system in this model using stellar atmosphere model…
The structure and X-ray radiation spectra of illuminated accretion disks in AGN. III. Modeling fractional variability
Ponti, G.; Różańska, A.; Dovčiak, M. +5 more
Context: .Random magnetic flares above the accretion disks of Active Galactic Nuclei can account for the production of the primary radiation and for the rapid X-ray variability that have been frequently observed in these objects. The primary component is partly reprocessed in the disk atmosphere, forming a hot spot underneath the flare source and …
A detailed observation of a LMC supernova remnant DEM L241 with XMM-Newton
Koyama, K.; Mori, K.; Bamba, A. +2 more
We report on an XMM-Newton observation of the supernova remnant (SNR)
X-ray emission from T Tauri stars in the Lupus 3 star-forming region
Gondoin, P.
Aims.In this paper, I present analysis results of an {XMM-Newton} observation of the Lupus 3 region that contains a high proportion of young low mass (M < 0.3 M⊙) T Tauri stars in the Lupus star-forming complex.
Methods: .The detection of X-ray sources in 0.5 to 4.5 keV images of the Lupus 3 core was performed using the standard …
A new symbiotic low mass X-ray binary system: 4U 1954+319
Caraveo, P. A.; de Luca, A.; Götz, D. +4 more
Aims.4U 1954+319 was discovered 25 years ago, but only recently has a clear picture of its nature begun to emerge. We present for the first time a broad-band spectrum of the source and a detailed timing study using more than one year of monitoring data.
Methods: .The timing and spectral analysis was done using publicly available Swift, INTEGRA…