An all sky study of fast X-ray transients

Details An all sky study of fast X-ray transients An all sky study of fast X-ray transients

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988phdt.........1c&link_type=abstract

Ph.D. Thesis National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbelt, MD.

Astronomy and Astrophysics

Astronomy

2

All Sky Photography, Transient Response, X Ray Astronomy, X Ray Sources, Binary Stars, Dwarf Stars, Flare Stars, Gamma Ray Bursts, Magellanic Clouds, Neutron Stars

Scientific paper

In the HEAO 1 A-2 survey of fast X-ray transients, a search of 2 to 20 keV scanning data was made for brief increases in flux, greater than 4 millicrabs, on timescales approximately 1 to 10 to the 4th s above a 12-hour average. The search was divided into two regions, and all-sky survey of the Galaxy, and a survey of the Magellanic Clouds. In the latter, 37 events were found and identified with 4 of the 5 brighest sources in the LMC, plus 2 as flares from a foreground star. Np X-ray bursts, no gamma-ray bursts, and no events from the SMC were found. In the all-sky survey, after excluding well-known variable sources, out of the equivalent of approximately 104 days of data, 15 events were found which falling into 2 broad categories: flares from coronal sources, roughly isotropically distributed, with optically thin thermal spectra; and harder fast transients apparently distributed near the Galactic plane. The first were identified as flares from ubiquitous active cool dwarf stars. It was hypothesized that the second may have been from distant Be-neutron star binaries. However, at least two of the harder, more luminous events remained unidentified. Future research should examine the nature of these rare events, and how they may fit into a hierarchy of hard fast transients from gamma-ray bursts to outbursts from pulsar systems.

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