Possible hard X-ray shortages in bursts from KS 1731-260 and 4U 1705-44

Abstract

Aims: 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 {\it 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 {\it RXTE} proportional counter array (PCA). 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 $0.9\pm 2.1$ s and $2.5\pm 2.0$ s with respect to the soft X-rays, respectively. While in their banana branches and other sources, we did not find any consistent shortage.

5 pages, 4 figures, accepted by A&A as a research note

References in corpus (6)

• X-ray Properties of Black-Hole Binaries
• Thermonuclear (type-I) X-ray bursts observed by the Rossi X-ray Timing Explorer
• The Existence of Inner Cool Disks in the Low Hard State of Accreting Black Holes
• The hard X-ray shortages prompted by the clock bursts in GS 1826--238
• The hard X-ray behavior of Aql X-1 during type-I bursts
• Flickering in Black Hole Accretion discs

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