2020ApJ...899L..19G

Query : 2020ApJ...899L..19G

2020ApJ...899L..19G - Astrophys. J., 899, L19-L19 (2020/August-2)

Insight-HXMT firm Detection of the highest-energy fundamental cyclotron resonance scattering feature in the spectrum of GRO J1008-57.

GE M.Y., JI L., ZHANG S.N., SANTANGELO A., LIU C.Z., DOROSHENKO V., STAUBERT R., QU J.L., ZHANG S., LU F.J., SONG L.M., LI T.P., TAO L., XU Y.P., CAO X.L., CHEN Y., BU Q.C., CAI C., CHANG Z., CHEN G., CHEN L., CHEN T.X., CHEN Y.B., CHEN Y.P., 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., HUANG Y., 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 B.S., LIU G.Q., LIU H.W., LIU X.J., LIU Y.N., LU B., LU X.F., LUO Q., LUO T., MA X., MENG B., NANG Y., NIE J.Y., OU G., SAI N., SHANG R.C., SONG X.Y., SUN L., TAN Y., TUO Y.L., WANG C., WANG G.F., WANG J., WANG L.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., XU H., 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., ZHENG S.J., ZHENG Y.G., ZHOU D.K., ZHOU J.F., ZHUANG R.L., ZHU Y.X. and ZHU Y.

Abstract (from CDS):

We report on the observation of the accreting pulsar GRO J1008-57 performed by Insight-Hard X-ray Modulation Telescope (HXMT) at the peak of the source's 2017 outburst. Pulsations are detected with a spin period of 93.283(1) s. The pulse profile shows double peaks at soft X-rays, and only one peak above 20 keV. The spectrum is well described by the phenomenological models of X-ray pulsars. A cyclotron resonant scattering feature (CRSF) is detected with very high statistical significance at a centroid energy of Ecyc=90.32–0.28+0.32 keV, for the reference continuum and line models, HIGHECUT and GABS, respectively. Detection is very robust with respect to different continuum models. The line energy is significantly higher than what is suggested from previous observations, which provided very marginal evidence for the line. This establishes a new record for the centroid energy of a fundamental CRSF observed in accreting pulsars. We also discuss the accretion regime of the source during the Insight-HXMT observation.

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

Journal keyword(s): High mass x-ray binary stars - Pulsars - Magnetic fields

Simbad objects: 4

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Number of rows : 4
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 X SMC X-2 HXB 00 54 33.43 -73 41 01.3 13.77 16.40 16.38   14.67 O9.5III-V 143 0
2 V* BQ Cam HXB 03 34 59.9116110096 +53 10 23.296879776   17.16 15.42 14.26 13.04 O8.5Ve 525 1
3 GRO J1008-571 HXB 10 09 46.9642314696 -58 17 35.603851848       14.63   B0e 269 0
4 V* HZ Her LXB 16 57 49.8110126616 +35 20 32.486555472 11.90 14.89 13.63 13.88   B3/6ep 2172 0

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