Swift monitoring of the central X-ray source in RCW 103

Details Swift monitoring of the central X-ray source in RCW 103 Swift monitoring of the central X-ray source in RCW 103

2011-07-19

arxiv.org/abs/1107.3770v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

6 pages, 5 figures, accepted for publication in MNRAS. Figures 2,3 and 5 in reduced quality

Scientific paper

The X-ray source 1E 161348-5055 lies at the centre of the 2-kyr-old supernova remnant RCW 103. Owing to its 24-ks modulation, orders-of-magnitude flux variability over a few months/years, and lack of an obvious optical counterpart, 1E 161348-5055 defies assignment to any known class of X-ray sources. Starting from April 2006, Swift observed 1E 161348-5055 with its X-ray telescope for 2 ks approximately once per month. During the five years covered, the source has remained in a quiescent state, with an average observed flux of 1.7e-12 erg/cm^2/s (1-10 keV), about 20 times lower than the historical maximum attained in its 1999-2000 outburst. The long time-span of the Swift data allows us to obtain an accurate measure of the period of 1E 161348-5055 [P = 24030.42(2) s] and to derive the first upper limit on its period derivative (|dP/dt| < 1.6e-9 s/s at 3 sigma).

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