Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992xrea.conf..187b&link_type=abstract
In its X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background p 187-190 (SEE N93-17094 05-90)
Astronomy and Astrophysics
Astronomy
Active Galactic Nuclei, Proportional Counters, Rosat Mission, Heao 2, Radiant Flux Density, Variability, X Ray Astronomy
Scientific paper
A long (33600 s) Rosat Position Sensitive Proportional Counter observation of the galaxy M101 was performed. The field includes the serendipitous Einstein source 1E1403 + 5439, which was previously observed to vary by a factor 5.5 in 160 days. Despite the higher sensitivity of the Rosat PSPC and the high exposure time, the source could not be detected down to a much lower flux limit than the lowest Einstein detection. The unusually high variability and the proximity (18 feet) to M101 make this source a good candidate for gravitational microlensing.
Belloni Tomaso
Snowden Steve L.
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