ALLEGRO: A New View of the Hard X-Ray Sky

Details ALLEGRO: A New View of the Hard X-Ray Sky ALLEGRO: A New View of the Hard X-Ray Sky

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.6407u&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #64.07; Bulletin of the American Astronomical Society, Vol. 29, p.1311

Astronomy and Astrophysics

Astronomy

Scientific paper

ALLEGRO is a proposed new MidEx-class NASA mission. This mission combines proven and available detector technology with innovative communications hardware to produce sensitive monitoring and mapping of the whole X-ray sky at high time resolution. It will generate an abundance of data and will provide continuity in hard X-ray astronomy acting as a bridge to the next ``large'' hard X-ray observatory. ALLEGRO consists of 16 large (2000 cm(2) ), thin, broadly-collimated NaI detectors operating from 7--200 keV (with 25% resolution at 20 keV). The instrument is zenith-pointed; its combined field-of-view (>2pi sr) covers the entire sky visible from low-Earth orbit. All detected events are transmitted to the ground, time-tagged to 125 microseconds and with full energy information. There is no time-averaging, data-selection, or triggering on-board. This will produce a long term, unbiased record of the complete X-ray sky with uniformly high resolution in both energy and time. ALLEGRO will have four times the sensitivity of BATSE for normal gamma-ray bursts (and better for short events), with better positioning and no limitations from on-board triggering. We will make the most comprehensive observations ever of the time variability and spectral characteristics of X-ray binaries, X-ray novae, and AGN. We will be able to produce an all-sky hard X-ray survey. ALLEGRO will have 3--5 times the OSSE sensitivity for steady emission from AGN and other sources. ALLEGRO will study pulsed hard X-ray emission from over 200 known radio pulsars and search for new, unknown pulsars with a sensitivity 10 times that of OSSE. The increased sensitivity and unique timing capabilities of ALLEGRO will open up a vast unexplored range of observational phase space, allowing ALLEGRO to make important discoveries of new sources and phenomena. Further information about ALLEGRO can be found on the WWW at: http://www.astro.nwu.edu/astro/allegro/

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