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The CCD and readout electronics for the OMC instrument on Integral
Culhane, J. L.; Smith, A.; Jordan, B. +4 more
The Optical Monitoring Camera (OMC) on ESA's Integral gamma-ray astronomy satellite is devoted to optical wavelength observations simultaneously covering the same field-of-view as the gamma-ray and X-ray instruments. The OMC consists of a refracting telescope with a CCD as the imaging device in the focal plane. Here we describe the CCD and its ass…
The origin of X-ray emission of two distant (z >1) cluster candidates with XMM-Newton
Arnaud, M.; Arnouts, S.; Benoist, C. +8 more
We present here a study of XMM-Newton data of two distant galaxy cluster candidates. One of these was discovered serendipitously in near infrared data,
Photometry with a periodic grid. II. Results for J2 Europa and S6 Titan
Hestroffer, D.
The Hipparcos satellite successfully gathered astrometric and photometric information for a few solar system objects including natural satellites. In contrast to the case for asteroids, the Hipparcos main-mission does not provide the photometry - in the conventional sense - of planetary satellites. Nevertheless, valuable photometric results can be…
A transient event in lines of Ne V, VI and VII
Jordan, C.; Houdebine, E. R.
We report observations of a transition region brightening made with the Coronal Diagnostic Spectrometer onboard the Solar and Heliospheric Observatory. We observed a region of the quiet Sun in 12 spectral lines with temperatures of formation from =~ 3 x 104 K to 1.1 x 106 K. The transient event occured in a network boundary r…
Testing SPI imaging of high-energy and extended sources
Strong, A. W.; Wunderer, C. B.; Connell, P. +2 more
INTEGRAL's main instruments employ coded apertures to obtain directional information on the incoming radiation. In order to experimentally better determine the imaging capabilities of the spectrometer SPI, the SPI Imaging Test Setup (SPITS) has been built at MPE. It consists of the SPI coded mask and two SPI-identical Ge detectors on an XY-table w…
Reduction of ringing effects by an improved deconvolution algorithm. Application to A370 CFHT image of gravitational arcs
Mellier, Y.; Aime, C.; Roche, M. +2 more
We develop a self-consistent automatic procedure to restore information from astronomical observations. It relies on both a new deconvolution algorithm called LBCA (Lower Bound Constraint Algorithm) and the use of the Wiener filter. In order to explore its scientific potential for strong and weak gravitational lensing, we process a CFHT image of t…