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20 papers · 1 filter
Gaia: Organisation and challenges for the data processing
F. Mignard, C. Bailer-Jones, U. Bastian +9
Gaia is an ambitious space astrometry mission of ESA with a main objective to map the sky in astrometry and photometry down to a magnitude 20 by the end of the next decade. While t…
SAXJ1712.6-3739: a persistent hard X-ray source as monitored with INTEGRAL
Mariateresa Fiocchi, Angela Bazzano, Pietro Ubertini +1
The X-ray source SAXJ1712.6-3739 is a very weak Low Mass X-ray Binary discovered in 1999 with BeppoSAX and located in the Galactic Center. This region has been deeply investigated…
Computing the Conditioning of the Components of a Linear Least Squares Solution
Marc Baboulin, Jack Dongarra, Serge Gratton +1
In this paper, we address the accuracy of the results for the overdetermined full rank linear least squares problem. We recall theoretical results obtained in Arioli, Baboulin and…
New constraints on the Mid-IR EBL from the HESS discovery of VHE gamma rays from 1ES 0229+200
HESS Collaboration, F. Aharonian
AIMS: To investigate the very high energy (VHE: >100 GeV) gamma-ray emission from the high-frequency peaked BL Lac 1ES 0229+200. METHODS: Observations of 1ES 0229+200 at energies a…
Large-scale variations of the cosmic X-ray background and the X-ray emissivity of the local Universe
M. Revnivtsev, S. Molkov, S. Sazonov
We study the cosmic X-ray background (CXB) intensity variations on large angular scales using slew data of the RXTE observatory. We detect intensity variations up to ~2% on angular…
Constraints on light bending and reflection from the hard X-ray background
P. Gandhi, A. C. Fabian, T. Suebsuwong +3
Light bending due to strong gravity has recently been invoked to explain variability and flux correlations between different bands in some accreting black holes. A characteristic f…