2018ApJ...864L..30C

Query : 2018ApJ...864L..30C

2018ApJ...864L..30C - Astrophys. J., 864, L30-L30 (2018/September-2)

Insight-HXMT observations of 4U 1636-536: corona cooling revealed with single short type-I X-ray burst.

CHEN Y.P., ZHANG S., QU J.L., ZHANG S.N., JI L., KONG L.D., CAO X.L., CHANG Z., CHEN G., CHEN L., CHEN T.X., CHEN Y., CHEN Y.B., CUI W., CUI W.W., DENG J.K., DONG Y.W., DU Y.Y., FU M.X., GAO G.H., GAO H., GAO M., GE M.Y., GU Y.D., GUAN J., GUO C.C., HAN D.W., HU W., HUANG Y., HUO J., JIA S.M., JIANG L.H., JIANG W.C., JIN J., JIN Y.J., LI B., LI C.K., LI G., LI M.S., LI T.P., LI W., LI X., LI X.B., LI X.F., LI Y.G., LI Z.J., LI Z.W., LIANG X.H., LIAO J.Y., LIU C.Z., LIU G.Q., LIU H.W., LIU S.Z., LIU X.J., LIU Y., LIU Y.N., LU B., LU F.J., LU X.F., LUO T., MA X., MENG B., NANG Y., NIE J.Y., OU G., SAI N., SONG L.M., SUN L., TAN Y., TAO L., TAO W.H., TUO Y.L., WANG G.F., WANG H.Y., WANG J., WANG W.S., WANG Y.S., WEN X.Y., WU B.B., WU M., XIAO G.C., XIONG S.L., XU H., XU Y.P., YAN L.L., YANG J.W., YANG S., YANG Y.J., ZHANG A.M., ZHANG C.L., ZHANG C.M., ZHANG F., ZHANG H.M., ZHANG J., ZHANG Q., ZHANG T., ZHANG W., ZHANG W.C., ZHANG W.Z., ZHANG Y., ZHANG Y., ZHANG Y.F., ZHANG Y.J., ZHANG Z., ZHANG Z.L., ZHAO H.S., ZHAO J.L., ZHAO X.F., ZHENG S.J., ZHU Y., ZHU Y.X. and ZOU C.L.

Abstract (from CDS):

Corona cooling was detected previously from stacking a series of short type I bursts that occurred during the low/hard state of an atoll outburst. Type I bursts are hence regarded as sharp probes used to better our understanding of the basic properties of the corona. The first Chinese X-ray satellite, Insight-HXMT, has a large detection area at hard X-rays that provides a unique opportunity to move further in this research field. We report the first detection of corona cooling by Insight-HXMT from a single short type I burst appearing during the flare of 4U 1636-536. This type I X-ray burst has a duration of ∼13 s and hard X-ray shortage is detected with a significance of 6.2σ in 40-70 keV. A cross-correlation analysis between the light curves of the soft and hard X-ray band shows that the corona shortage lags the burst emission by 1.6 ± 1.2 s. These results are consistent with those derived previously from stacking a large amount of bursts detected by RXTE/PCA within a series of flares of 4U 1636-536. Moreover, the broad bandwidth of Insight-HXMT also allows, for the first time, one to infer the burst influence upon the continuum spectrum via performing the spectral fitting of the burst, which points to the finding that hard X-ray shortage appears at around 40 keV in the continuum spectrum. These results suggest that the evolution of the corona, along with the outburst/flare of NS XRB, may be traced via analyzing a series of embedded type I bursts using Insight-HXMT.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): stars: coronae - stars: neutron - X-rays: binaries - X-rays: bursts - X-rays: individual: 4U 1636-536

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* V801 Ara LXB 16 40 55.5976953528 -53 45 04.948107156 17.50 18.20 17.5   17.07 ~ 921 0
2 1RXS J170855.6-440653 LXB 17 08 54.346 -44 06 08.38           ~ 406 1
3 NAME Slow Burster LXB 17 31 58.0 -33 49 58     15.50     ~ 865 1
4 KS 1731-260 LXB 17 34 13.46 -26 05 18.6       22.8 20.9 ~ 437 0
5 [KRL2007b] 277 LXB 17 47 18.06 -27 20 38.9           ~ 88 0
6 V* V4634 Sgr LXB 18 29 28.8 -23 47 48 18.90 19.40 19     ~ 399 0
7 X Aql X-1 LXB 19 11 16.0571313336 +00 35 05.868232692           ~ 1186 1

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