Millisecond Dip Events in the 2007 RXTE/PCA Data of Sco X-1

Details Millisecond Dip Events in the 2007 RXTE/PCA Data of Sco X-1 Millisecond Dip Events in the 2007 RXTE/PCA Data of Sco X-1

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...21116105l&link_type=abstract

American Astronomical Society, AAS Meeting #211, #161.05

Astronomy and Astrophysics

Astronomy

Scientific paper

We report preliminary results of search for millisecond dip events with the new RXTE/PCA data of Sco X-1 taken in year 2007. Adopting the same selection criteria as that in previous study, we found that there are only 3 dip events in about 85 ks data, much fewer than the 107 events found in 560 ks data reported earlier with archival data taken from 1996 to 2002. The new data provide more detailed information of
the 'very large event' (VLE). Although the number of VLE does not obviously increase during the occurrence of dip events, all the 3 dip events are coincident in time with VLEs that have no flags set for any of the propane or the 6 main xenon anodes. It is a strong indication for instrumental effect. With only 3 dip events, however, the previously proposed possibility that about 10 percent of the dip events might not be instrumental still cannot be strictly excluded. More properties of these dip events are discussed in this paper.
This work was supported by the National Science Council of the Republic of China.

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