Timing Noise Properties of GRO J0422+32

Abstract

OSSE observed the transient black hole candidate GRO J0422+32 (XN Per 92) between 1992 Aug 11 and 1992 Sep 17. High time resolution data were obtained in several energy bands over the 35-600 keV range with a sampling rate of 8 ms. Power spectra at energies below 175 keV show substantial low-frequency red noise with a shoulder at a few tens of mHz, peaked noise with characteristic frequency near 0.2 Hz, and a second shoulder at a few Hz. The frequencies of the shoulders and the peak are independent of energy and source intensity. The complex cross spectrum indicates that photons in the 75-175 keV band lag photons in the 35-60 keV band by a time roughly proportional to the inverse of the Fourier frequency. The maximum lag observed is about 300 ms. The power and lag spectra are consistent with the production of the gamma rays through thermal Comptonization in an extended hot corona with a power-law density profile.

14 pages, 2 figs, uses psfig, accepted for pub in ApJ Letters

References in corpus (2)

• Gamma-Ray Spectral States of Galactic Black Hole Candidates
• Hard X-ray Lags in Cygnus X-1

Cited by in corpus (13)

• Correlations in Quasi-Periodic Oscillation and Noise Frequencies Among Neutron-Star and Black-Hole X-ray Binaries
• The broad-band power spectra of X-ray binaries
• A New Model for the Hard Time Lags in Black Hole X-Ray Binaries
• Phase Lag and Coherence Function of X-ray emission from Black Hole Candidate XTE J1550-564
• Quasi-periodic variability and the inner radii of thin accretion disks in galactic black-hole systems
• Understanding Spectral Variability and Time Lags in Accreting Black Holes
• Impact of reverberation in flared accretion discs on temporal characteristics of X-ray binaries
• A Spectral Study of the Black Hole Candidate XTE J1752-223 in the High/Soft State with MAXI, Suzaku and Swift
• Probing the Structure of Accreting Compact Sources Through X-Ray Time Lags and Spectra
• RXTE Observations of an Outburst of Recurrent X-ray Nova GS 1354-644
• Modeling The Time Variability of Accreting Compact Sources
• On the Nature of the mHz X-Ray Quasi-periodic Oscillations from Ultraluminous X-Ray Source M82 X-1: Search for Timing-Spectral Correlations
• Timing Analysis of V404 Cyg during Its Brightest Outburst with INTEGRAL/SPI