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Possible hard X-ray shortages in bursts from KS 1731-260 and 4U 1705-44 (Research Note)
Ji L(纪龙); Zhang S(张澍); Chen YP(陈玉鹏); Ji, L; Zhang, S; Chen, YP; Zhang, SN; Kretschmar, P; Wang, JM; Li, J; Zhang SN(张双南); Wang JM(王建民); Li J(李剑)
AbstractAims. A hard X-ray shortage, implying the cooling of the corona, was observed during bursts of IGR J17473-272, 4U 1636-536, Aql X-1, and GS 1826-238. Apart from these four sources, we investigate here an atoll sample, in which the number of bursts for each source is larger than 5, to explore the possible additional hard X-ray shortage during Rossi X-ray timing explorer (RXTE) era. Methods. According to the source catalog that shows type-I bursts, we analyzed all the available pointing observations of these sources carried out by the RXTE proportional counter array. We grouped and combined the bursts according to their outburst states and searched for the possible hard X-ray shortage while bursting. Results. We found that the island states of KS 1731-260 and 4U 1705-44 show a hard X-ray shortage at significant levels of 4.5 and 4.7 sigma and a systematic time lag of 0.9 +/- 2.1 s and 2.5 +/- 2.0 s with respect to the soft X-rays, respectively. While in their banana branches and other sources, we did not find any consistent shortage.
Keywordstars: coronae X-rays: binaries X-rays: bursts stars: neutron
Subject AreaAstronomy & Astrophysics
WOS IDWOS:000334671000020
ADS Bibcode2014A&A...564A..20J
ADS URLhttps://ui.adsabs.harvard.edu/abs/2014A&A...564A..20J
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2014A&A...564A..20J/citations
Citation statistics
Cited Times:12 [INSPIRE]
Cited Times:17 [ADS]
Document Type期刊论文
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GB/T 7714
Ji L,Zhang S,Chen YP,et al. Possible hard X-ray shortages in bursts from KS 1731-260 and 4U 1705-44 (Research Note)[J]. ASTRONOMY & ASTROPHYSICS,2014,564:A20.
APA 纪龙.,张澍.,陈玉鹏.,Ji, L.,Zhang, S.,...&李剑.(2014).Possible hard X-ray shortages in bursts from KS 1731-260 and 4U 1705-44 (Research Note).ASTRONOMY & ASTROPHYSICS,564,A20.
MLA 纪龙,et al."Possible hard X-ray shortages in bursts from KS 1731-260 and 4U 1705-44 (Research Note)".ASTRONOMY & ASTROPHYSICS 564(2014):A20.
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