Discovery of 111 second pulsation from the X-ray source Scutum X-1

Details Discovery of 111 second pulsation from the X-ray source Scutum X-1 Discovery of 111 second pulsation from the X-ray source Scutum X-1

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370l..77k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 370, April 1, 1991, p. L77-L79.

Astronomy and Astrophysics

Astrophysics

14

Pulsars, Pulsed Radiation, X Ray Sources, X Ray Spectra, Absorption Spectra, Astronomical Maps, Energy Spectra, Proportional Counters

Scientific paper

A 111-sec-period X-ray pulsation from Sct X-1 is reported. The pulse profile was found to exhibit double peaks. The x-ray spectrum of Sct X-1 is fitted by a single power-law function with a photon index of about 1.9. Evidence for extremely large absorption (greater than 10 to the 23rd H/sq cm) has been found in the low-energy band and near the iron K-edge. When combined with the previous observations, these data show that the X-ray flux has been variable over more than two orders of magnitude.

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