2022A&A...666A.172Z


Query : 2022A&A...666A.172Z

2022A&A...666A.172Z - Astronomy and Astrophysics, volume 666A, 172 (2022/10-1)

The spectral-timing analysis of Cygnus X-1 with Insight-HXMT.

ZHOU M., GRINBERG V., BU Q.-C., SANTANGELO A., CANGEMI F., DIEZ C.M., KONIG O., JI L., NOWAK M.A., POTTSCHMIDT K., RODRIGUEZ J., WILMS J., ZHANG S., QU J.-L. and ZHANG S.-N.

Abstract (from CDS):

Cygnus X-1, as the first discovered black hole binary, is a key source for understanding the mechanisms of state transitions and the scenarios of accretion in extreme gravity fields. We present a spectral-timing analysis of observations taken with the Insight-Hard X-ray Modulation Telescope (HXMT) mission, focusing on the spectral-state-dependent timing properties in the broad energy range of 1-150 keV, thus extending previous studies based on Rossi X-ray Timing Explorer (RXTE) to both lower and higher energies. Our main results are the following: (a) We successfully use a simple empirical model to fit all spectra, confirming that the reflection component is stronger in the soft state than in the hard state. (b) The evolution of the total fractional root mean square (rms) depends on the selected energy band and the spectral shape, which is a direct result of the evolution of the power spectral densities (PSDs). (c) In the hard/intermediate state, we see clear short-term variability features and a positive correlation between the central frequencies of the variability components and the soft photon index Γ1, which we also see at energies above 15 keV. In the soft state, the power spectrum is instead dominated by red noise. These behaviors can be traced to at least 90 keV. (d) Finally, the coherence and the phase-lag spectra show different behaviors, depending on the different spectral shapes.

Abstract Copyright: © M. Zhou et al. 2022

Journal keyword(s): X-rays: binaries - accretion - accretion disks - X-rays: individuals: Cygnus X-1 - stars: black holes

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* V381 Nor HXB 15 50 58.6637920704 -56 28 35.258385000   17.95 16.6     K3III 1175 0
2 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 521 0
3 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1888 1
4 V* V821 Ara HXB 17 02 49.3876391280 -48 47 23.087954544 16.20 16.30 15.5     ~ 2089 0
5 2MAXI J1753-013 LXB 17 53 28.2898766424 -01 27 06.256555272 15.30 16.73 16.46 16.15 15.64 ~ 365 0
6 MAXI J1820+070 LXB 18 20 21.9423816480 +07 11 07.284859440           ~ 351 0
7 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2633 0
8 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4349 0

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