C. A. Oxborrow
Technical University of Denmark
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Astronomy and Astrophysics | 2003
J. Huovelin; Sami Maisala; J. Schultz; Niels Jørgen Stenfeldt Westergaard; C. A. Oxborrow; P. Kretschmar; Niels Lund
Background and determination of its components for the JEM-X X-ray telescope on INTEGRAL are discussed. A part of the first background observations by JEM-X are analysed and results are compared to predictions. The observations are based on extensive imaging of background near the Crab Nebula on revolution 41 of INTEGRAL. Total observing time used for the analysis was 216 502 s, with the average of 25 cps of background for each of the two JEM-X telescopes. JEM-X1 showed slightly higher average background intensity than JEM-X2. The detectors were stable during the long exposures, and weak orbital phase dependence in the background outside radiation belts was observed. The analysis yielded an average of 5 cps for the diuse background, and 20 cps for the instrument background. The instrument background was found highly dependent on position, both for spectral shape and intensity. Diuse background was enhanced in the central area of a detector, and it decreased radially towards the edge, with a clear vignetting eect for both JEM-X units. The instrument background was weakest in the central area of a detector and showed a steep increase at the very edges of both JEM-X detectors, with significant dierence in spatial signatures between JEM-X units. According to our modelling, instrument background dominates over diuse background in all positions and for all energies of JEM-X.
Proceedings of SPIE | 2006
Carl Budtz-Jørgensen; Niels Lund; N. J. Westergaard; S. Brandt; C. A. Oxborrow; J. Chenevez; I. Lundgaard Rasmussen; Steen Laursen; Søren Møller Pedersen; Josef Polny; Peter Kretschmar; Osmi Vilhu; M. Feroci; Filippo Frontera; G. Juchnikowski; V. Reglero; S. Martínez-Núnez; Stefan Larsson; Andrzej A. Zdziarski; S. Fahmy
We report on the technical and scientific performance of JEM-X, the X-ray monitor on ESAs INTEGRAL mission. INTEGRAL has now been in orbit for more than three years, and the mission is foreseen to be extended until the end of 2010. Overall, JEM-X performs very well, and can be expected to continue to do so for the duration of the mission. We discuss in some detail the operational experiences and the problems encountered with the microstrip detectors caused by the space environment and give one example of the interesting scientific results obtained. The analysis software is still being improved on, and we discuss briefly the significance of these improvements.
The astronomer's telegram | 2011
J. Chenevez; Niels Lund; Niels Jørgen Stenfeldt Westergaard; Carl Budtz-Jørgensen; S. Brandt; C. A. Oxborrow; Niels Elkjær Iversen; J. L. Rodriguez
P o S - Proceedings of Science | 2009
Carl Budtz-Jørgensen; Niels Lund; Niels Jørgen Stenfeldt Westergaard; S. Brandt; J. Chenevez; C. A. Oxborrow; Ib Lundgaard Rasmussen
The astronomer's telegram | 2006
S. Brandt; Carl Budtz-Jørgensen; J. Chenevez; Niels Lund; C. A. Oxborrow; Niels Jørgen Stenfeldt Westergaard
The astronomer's telegram | 2006
Niels Jørgen Stenfeldt Westergaard; Carl Budtz-Jørgensen; J. Chenevez; Niels Lund; S. Brandt; C. A. Oxborrow
Archive | 2006
C. A. Oxborrow; J. Chenevez; Peter Kretschmar; S. Larsson; Sami Maisala; Niels Jørgen Stenfeldt Westergaard
The 5th INTEGRAL Workshop | 2004
Niels Lund; Carl Budtz-Jørgensen; C. A. Oxborrow; J. Chenevez; S. Brandt; Ib Lundgaard Rasmussen; Niels Jørgen Stenfeldt Westergaard
Archive | 2004
C. A. Oxborrow; Niels Lund; Soren Brandt; J. Chenevez; Carl Budtz-Jørgensen; Niels Joergen Westergaard; I. Lundgaard Rasmussen; Peter Kretschmar
Archive | 2000
C. A. Oxborrow; P. Kretschmar; Niels Jørgen Stenfeldt Westergaard; Stefan Larsson; Sami Maisala
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