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- W2022346812 abstract "Two soft X-ray sources appeared at a level 10 times the HEAO 1 A-2 experiment's scanning sensitivity for approx.10/sup 4/--10/sup 5/ 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 approx.2 x 10/sup 6/ K to approx.1 x 10/sup 6/ K. The transient designated H0336--26 appeared on 1978 February 3 and had a temperature no higher than 10/sup 6/ K. The 90% confidence error bars 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 approx.10/sup 30/ erg s/sup -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 approx.100 such transients per year." @default.
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- W2022346812 date "1980-12-01" @default.
- W2022346812 modified "2023-10-16" @default.
- W2022346812 title "Two fast soft X-ray transients at high galactic latitude" @default.
- W2022346812 doi "https://doi.org/10.1086/158542" @default.
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