Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15r.157b&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 15, no. 5, p. (5)157-(5)160
Astronomy and Astrophysics
Astronomy
2
Apertures, Balloon-Borne Instruments, Gamma Ray Astronomy, Masks, Signal To Noise Ratios, X Ray Astronomy, X Ray Telescopes, Angular Resolution, Field Of View, Galactic Bulge, X Ray Sources
Scientific paper
TIMAX is a balloon-borne hard X-ray coded-aperture imaging telescope designed to make 10 deg x 10 deg fields with approximately 2 deg angular resolution. The main goal of the experiment is to study the galactic center, where several X-ray sources have recently been discovered and identified. The TIMAX calibration in the laboratory showed that the mask-antimask method of suppressing the systematic background non-uniformity over the detector plane is very effective for recovering the signal-to-noise ratios (SNRs) of the images, when combined with multiplicative flat-fielding techniques. The overall improvement in SNR for highly-exposed images was a factor of approximately 7.5. Although a battery failure did not allow the scientific goals of the first flight to be achieved, the instrumental background measured during the flight demonstrated the ability for imaging the galactic center.
Braga Jaoa
D'Amico Flavio
Villela Thyrso
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