Search Publications
INTEGRAL observation of V 0332+53 in outburst
Santangelo, A.; Walter, R.; Mowlavi, N. +9 more
We present the analysis of a 100 ks INTEGRAL (3-100 keV) observation of the transient X-ray pulsar V 0332+53in outburst. The source is pulsating at PPulse=4.3751±0.0002 s with a clear double pulse from 6 keVto 60 keV. The average flux was ~550 mCrab between 20 keVand 60 keV. We modeled the broad band continuum from 5 keVto 100 keVwith a…
High mass X-ray binaries in the LMC: Dependence on the stellar population age and the ``propeller'' effect
Gilfanov, M.; Shtykovskiy, P.
We study the population of compact X-ray sources in the Large Magellanic Cloud using the archival data of the XMM-Newton observatory. The total area of the survey is ≈ 3.8 square degrees with a limiting sensitivity of ≈10-14 erg/s/cm2, corresponding to a luminosity of ≈3× 1033 erg/s at the LMC distance. Out of ∼460…
Stephan's Quintet with XMM-Newton
Pietsch, W.; Breitschwerdt, D.; Trinchieri, G. +1 more
The prototype compact group known as Stephan's Quintet (SQ) was observed with XMM-Newton in order to complement the excellent resolution of Chandra with high sensitivity to extended emission. SQ is a dynamic environment whose main effect, at both X-ray and optical wavelengths, appears to be ISM stripping. This is manifested by: 1) secular evolutio…
Identification of the optical counterparts of high-mass X-ray binaries through optical photometry and spectroscopy
Reig, P.; Negueruela, I.; Manousakis, A. +2 more
We present the results of our search for optical counterparts to high-mass X-ray transient sources discovered by various X-ray missions. We obtained CCD images of the X-ray fields through BVR and Hα filters to identify early-type stars in the R-Hα versus B-V colour-colour diagram. We also obtained medium-resolution spectroscopy of the candidates i…
XMM-Newton timing mode observations of Mrk 421
Haberl, F.; Papadakis, I. E.; Brinkmann, W. +2 more
We present the results of a detailed temporal analysis of the bright BL Lac object Mrk 421 using the three available long timing mode observations by the EPIC PN camera. This detector mode is characterized by its long life time and is largely free of photon pile-up problems. The source was found in different intensity and variability states differ…
A new reduction of the raw Hipparcos data
van Leeuwen, F.; Fantino, E.
We present an outline of a new reduction of the Hipparcos astrometric data, the justifications of which are described in the accompanying paper. The emphasis is on those aspects of the data analysis that are fundamentally different from the ones used for the catalogue published in 1997. The new reduction uses a dynamical modelling of the satellite…
The low X-ray state of LS 5039 / RX J1826.2-1450
Motch, C.; Negueruela, I.; Martocchia, A.
Recent XMM-Newton and Chandra observations of the high mass X-ray binary LS 5039 / RX J1826.2-1450 caught the source in a faint X-ray state. In contrast with previous RXTE observations, we fail to detect any evidence of iron line emission. We also fail to detect X-ray pulsations. The X-ray spectrum can be well fitted by a simple powerlaw, slightly…
The XMM-LSS survey. The XMDS/VVDS 4σ catalogue
Maccagni, D.; Maraschi, L.; Chiappetti, L. +15 more
We present a first catalogue of X-ray sources resulting from the central area of the XMM-LSS (Large Scale Structure survey). We describe the reduction procedures and the database tools we developed and used to derive a well defined catalogue of X-ray sources. The present catalogue is limited to a sub-sample of 286 sources detected at 4 σ in the 1 …
The X-ray emission from Young Stellar Objects in the ρ Ophiuchi cloud core as seen by XMM-Newton.
Grosso, N.; Montmerle, T.; Ozawa, H.
We observed the main core F of the ρ Ophiuchi cloud, an active star-forming region located at d ∼ 140 pc, using XMM-Newton with an exposure of 33 ks. We detect 87 X-ray sources within the 30 arcmin diameter field-of-view of the EPIC imaging detector array. We cross-correlate the positions of XMM-Newton X-ray sources with previous X-ray, infrared (…
Inferred acoustic rates of solar p modes from several helioseismic instruments
Goupil, M. -J.; Baudin, F.; Chaplin, W. J. +5 more
Acoustic rates of excitation of solar p modes can be estimated from observations in order to place constraints on the modelling of the excitation process and the layers where it occurs in the star. For several reasons (including a poor signal to noise ratio and mode overlap), this estimation is difficult. In this work, we use three completely inde…