2021ApJ...919...92B

Query : 2021ApJ...919...92B

2021ApJ...919...92B - Astrophys. J., 919, 92-92 (2021/October-1)

Broadband variability study of MAXI J1631-479 in its hard-intermediate state observed with Insight-HXMT.

BU Q.C., ZHANG S.N., SANTANGELO A., BELLONI T.M., ZHANG L., QU J.L., TAO L., HUANG Y., MA X., LI Z.S., ZHANG S., CHEN L., CAI C., CAO X.L., CHANG Z., CHEN T.X., CHEN Y., CHEN Y.P., CUI W.W., DU Y.Y., GAO G.H., GAO H., GE M.Y., GU Y.D., GUAN J., GUO C.C., HAN D.W., HUO J., JIA S.M., JIANG W.C., JIN J., KONG L.D., LI B., LI C.K., LI G., LI T.P., LI W., LI X., LI X.B., LI X.F., LI Z.W., LIANG X.H., LIAO J.Y., LIU C.Z., LIU H.X., LIU H.W., LIU X.J., LU F.J., LU X.F., LUO Q., LUO T., MA R.C., MENG B., NANG Y., NIE J.Y., OU G., SAI N., SONG L.M., SONG X.Y., SUN L., TAN Y., TUO Y.L., WANG C., WANG L.J., WANG P.J., WANG W.S., WANG Y.S., WEN X.Y., WU B.Y., WU B.B., WU M., XIAO G.C., XIAO S., XIONG S.L., XU Y.P., YANG S., YANG Y.J., YI Q.B., YIN Q.Q., YOU Y., ZHANG F., ZHANG H.M., ZHANG J., ZHANG P., ZHANG W.C., ZHANG W., ZHANG Y.F., ZHANG Y.H., ZHAO H.S., ZHAO X.F., ZHENG S.J., ZHOU D.K. (The Insight-HMXT Collaboration)

Abstract (from CDS):

We report the energy-resolved broadband timing analysis of the black hole X-ray transient MAXI J1631-479 during its 2019 outburst from February 11 to April 9, using data from the Insight-Hard X-ray Modulation Telescope (Insight-HXMT), which caught the source from its hard-intermediate state to the soft state. Thanks to the large effective area of Insight-HXMT at high energies, we are able to present the energy dependence of fast variability up to ∼100 keV. Type-C quasi-periodic oscillations (QPOs) with a frequency varying between 4.9 and 6.5 Hz are observed in the 1-100 keV energy band. While the QPO fractional rms increases with photon energy from 1 keV to ∼10 keV and remains more or less constant from ∼10 keV to ∼100 keV, the rms of the flat-top noise first increases from 1 keV to ∼8 keV and then drops to less than 0.1% above ∼30 keV. We suggest that the disappearance of the broadband variability above 30 keV could be caused by the nonthermal acceleration in the Comptonizing plasma. At the same time, the QPOs could be produced by the precession of either a small-scale jet or a hot inner flow model.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Stellar accretion disks - Low-mass x-ray binary stars - Black hole physics

Simbad objects: 11

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Number of rows : 11
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 MAXI J1535-571 XB* 15 35 19.73 -57 13 48.1           ~ 214 0
2 V* V381 Nor HXB 15 50 58.6637920704 -56 28 35.258385000           K3III 1254 0
3 V* QX Nor LXB 16 12 43.0 -52 25 26           ~ 946 1
4 1RXS J161741.2-510455 X 16 17 41.375 -51 04 55.23           ~ 3 0
5 MAXI J1631-479 XB? 16 31 14.06 -47 48 25.6           ~ 56 0
6 4U 1642-45 LXB 16 45 48.1 -45 36 42           ~ 467 1
7 V* V821 Ara LXB 17 02 49.3876391280 -48 47 23.087954544         15.322 ~ 2237 0
8 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 805 0
9 MAXI J1820+070 LXB 18 20 21.9423816480 +07 11 07.284859440           ~ 511 0
10 V* V406 Vul HXB 18 58 41.49127200 +22 39 29.7746640           G5V-K0V 409 0
11 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2810 0

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