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Title:
Millisecond dips in the RXTE/PCA light curve of Sco X-1 and trans-Neptunian object occultation
Authors:
Chang, Hsiang-Kuang; Liang, Jau-Shian; Liu, Chih-Yuan; King, Sun-Kun
Affiliation:
AA(Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan; Institute of Astronomy, National Tsing Hua University, Hsinchu 30013, Taiwan), AB(Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan), AC(Institute of Astronomy, National Tsing Hua University, Hsinchu 30013, Taiwan), AD(Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 10617, Taiwan)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 378, Issue 4, pp. 1287-1297. (MNRAS Homepage)
Publication Date:
07/2007
Origin:
MNRAS
MNRAS Keywords:
occultations , Kuiper Belt , Solar system: formation , stars: neutron , X-rays: binaries
Abstract Copyright:
(c) 2007 The Authors. Journal compilation © 2007 RAS
DOI:
10.1111/j.1365-2966.2007.11729.x
Bibliographic Code:
2007MNRAS.378.1287C

Abstract

Millisecond dips in the RXTE/Proportional Counter Array (PCA) light curve of Sco X-1 were reported recently, which were interpreted as the occultation of X-rays from Sco X-1 caused by trans-Neptunian objects (TNO) of 100-m size. Inconclusive signatures of possible instrumental effects in many of these dip events related to high-energy cosmic rays were later found and the TNO interpretation became shaky. Here, we report more detailed analysis aiming at distinguishing true occultation events from those related to cosmic rays. Based on some indicative criteria derived from housekeeping data and two-channel spectral information, we suggest that about 10 per cent of the dips are probable events of occultation. The total number of TNOs of size from 60 to 100 m is estimated to be about 1015 accordingly. Limited by the coarser time resolution of standard data modes of RXTE/PCA, however, definite results cannot be obtained. Adequately configured observations with RXTE or other new instruments in the future are very much desired.
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