Two fast soft X-ray transients at high galactic latitude

Details Two fast soft X-ray transients at high galactic latitude Two fast soft X-ray transients at high galactic latitude

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242.1107n&link_type=abstract

Astrophysical Journal, Part 1, vol. 242, Dec. 15, 1980, p. 1107-1113. Research supported by the U.S. Department of Energy;

Astronomy and Astrophysics

Astrophysics

5

Bursts, Light Curve, Transient Oscillations, X Ray Sources, X Ray Spectra, Charged Particles, Efficiency, Errors, Field Of View, Heao 2, Incident Radiation, Proportional Counters, Transient Response

Scientific paper

Two soft X-ray sources appeared at a level 10 times the HEAO 1 A-2 experiment's scanning sensitivity for ˜104 -l05 s, and then dropped below detectability. Both sources were discovered at high galactic latitude. The transient designated H0850+13 appeared on 1977 November 4. In three consecutive observations made within 6 hours a softening of the source spectrum was observed, consistent with decline of temperature of ˜2 × 106 K to ˜1 × 106 K. The transient designated H0336-26 appeared on 1978 February 3 and had a temperature no higher than 106 K. The 90% confidence error boxes for these sources contain no convincing optical counterparts. Assuming a hypothetical distance to the sources of 10 pc, the observed intensity implies their luminosities are 1030 ergs s-1. As the HEAO 1 A-2 experiment's ability to detect such rapid transients is quite limited, the total rate of similar transients may be quite high. Assuming these two detections were random samplings of a population of transient sources isotropically distributed over the sky and occurring at a constant rate over time, we estimate there may be ˜100 such transients per year.

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