2020ApJ...896...33W

Query : 2020ApJ...896...33W

2020ApJ...896...33W - Astrophys. J., 896, 33-33 (2020/June-2)

The evolution of the broadband temporal features observed in the black-hole transient MAXI J1820+070 with Insight-HXMT.

WANG Y., JI L., ZHANG S.N., MENDEZ M., QU J.L., MAGGI P., GE M.Y., QIAO E., TAO L., ZHANG S., ALTAMIRANO D., ZHANG L., MA X., LU F.J., LI T.P., HUANG Y., ZHENG S.J., CHEN Y.P., CHANG Z., TUO Y.L., GUNGOR C., SONG L.M., XU Y.P., CAO X.L., CHEN Y., LIU C.Z., BU Q.C., CAI C., CHEN G., CHEN L., CHEN T.X., 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., GU Y.D., GUAN J., GUO C.C., HAN D.W., HUO J., JIA S.M., JIANG L.H., JIANG W.C., JIN J., JIN Y.J., KONG L.D., LI B., LI C.K., LI G., LI M.S., LI W., LI X., LI X.B., LI X.F., LI Y.G., LI Z.W., LIANG X.H., LIAO J.Y., LIU G.Q., LIU H.W., LIU X.J., LIU Y.N., LU B., LU X.F., LUO Q., LUO T., MENG B., NANG Y., NIE J.Y., OU G., SAI N., SHANG R.C., SONG X.Y., SUN L., TAN Y., WANG G.F., WANG J., WANG W.S., WANG Y.D., WANG Y.S., WEN X.Y., WU B.B., WU B.Y., WU M., XIAO G.C., XIAO S., XIONG S.L., YANG J.W., YANG S., YANG Y.J., YANG Y.J., YI Q.B., YIN Q.Q., YOU Y., ZHANG A.M., ZHANG C.M., ZHANG F., ZHANG H.M., ZHANG J., ZHANG T., ZHANG W.C., ZHANG W., ZHANG W.Z., ZHANG Y., ZHANG Y.F., ZHANG Y.J., ZHANG Y., ZHANG Z., ZHANG Z., ZHANG Z.L., ZHAO H.S., ZHAO X.F., ZHOU D.K., ZHOU J.F., ZHUANG R.L., ZHU Y.X., ZHU Y. and WANG L.

Abstract (from CDS):

We study the evolution of the temporal properties of MAXI J1820+070 during the 2018 outburst in its hard state from MJD 58,190 to 58,289 with Insight-HXMT in a broad energy band 1-150 keV. We find different behaviors of the hardness ratio, the fractional rms and time lag before and after MJD 58,257, suggesting a transition occurred around this point. The observed time lags between the soft photons in the 1-5 keV band and the hard photons in higher energy bands, up to 150 keV, are frequency-dependent: the time lags in the low-frequency range, 2-10 mHz, are both soft and hard lags with a timescale of dozens of seconds but without a clear trend along the outburst; the time lags in the high-frequency range, 1-10 Hz, are only hard lags with a timescale of tens of milliseconds; they first increase until around MJD 58,257 and decrease after this date. The high-frequency time lags are significantly correlated to the photon index derived from the fit to the quasi-simultaneous NICER spectrum in the 1-10 keV band. This result is qualitatively consistent with a model in which the high-frequency time lags are produced by Comptonization in a jet.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Black holes - Compact objects - Low-mass x-ray binary stars

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* V381 Nor HXB 15 50 58.6637920704 -56 28 35.258385000           K3III 1254 0
2 V* V821 Ara LXB 17 02 49.3876391280 -48 47 23.087954544         15.322 ~ 2237 0
3 SWIFT J174510.8-262411 LXB 17 45 10.849 -26 24 12.60           ~ 78 0
4 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 805 0
5 2MAXI J1753-013 LXB 17 53 28.2898766424 -01 27 06.256555272 15.30 16.73 16.46 16.15 15.64 ~ 384 0
6 MAXI J1820+070 LXB 18 20 21.9423816480 +07 11 07.284859440           ~ 511 0
7 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4590 0

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