Observational Signatures of Black Holes: Spectral and Temporal Features of XTE J1550-564

Abstract

The theoretical predictions of the converging inflow, or Bulk-Motion Comptonization model are discussed and some predictions are compared to X- and gamma-ray observations of the high/soft state of Galactic black hole candidate XTE J1550+564. The 100 Hz QPO phenomenon tends to be detected in the high-state at times when the bolometric luminosity surges and the hard-power-law spectral component is dominant. Furthermore, the power in these features increases with energy. We offer interpretation of this phenomenon, as oscillations of the innermost part of the accretion disk, which in turn supplies the seed photons for the converging inflow where the hard power-law is formed through Bulk Motion Comptonization (BMC). We further argue that the noted lack of coherence between intensity variations of the high-soft-state low and high energy bands is a natural consequence of our model, and that a natural explanation for the observed hard and soft lag phenomenon is offered. In addition, we address some criticisms of the BMC model supporting our claims with observational results.

17 pages, 5 figures, accepted by the Astrophysical Journal

References in corpus (8)

• OSSE and RXTE Observations of GRS 1915+105: Evidence for Non-thermal Comptonization
• A Black Hole of > 6 Solar Masses in the X-ray Nova XTE J1118+480
• The Halo Black-Hole X-ray Transient XTE J1118+480
• A Transition to the Soft State in GRS 1758-258
• On the two types of steady hard X-ray states of GRS 1915+105
• Disk Diffusion Propagation Model for the Outburst of XTE J1118+480
• Timing and Spectral Properties of X-ray Emission from the Converging Flows onto Black hole: Monte-Carlo Simulations
• Orbital Comptonization in accretion disks around black holes

Cited by in corpus (19)

• X-ray Properties of Black-Hole Binaries
• X-ray Polarization from Accreting Black Holes: Coronal Emission
• Chandra/HETGS Spectroscopy of the Galactic Black Hole GX 339-4: A Relativistic Iron Line and Evidence for a Seyfert-like Warm Absorber
• Spectral Index and Quasi-Periodic Oscillation Frequency Correlation in Black Hole (BH) Sources: Observational Evidence of Two Phases and Phase Transition in BHs
• The hard X-ray spectral evolution in X-ray binaries and its application to constrain the black hole mass of ultraluminous X-ray sources
• Spectral and Timing Evolution of the Black Hole X-ray Nova 4U 1543-47 During its 2002 Outburst
• X-ray Spectra from MHD Simulations of Accreting Black Holes
• Black Hole Mass of the Ultraluminous X-ray source M82 X-1
• Evidence for a Neutron Star in the non-pulsating massive X-ray binary 4U2206+54
• Spectral Formation in X-Ray Pulsars: Bulk Comptonization in the Accretion Shock
• XMM-Newton observations of the spiral galaxy M74 (NGC 628)
• A Method for Black Hole Mass Determination in Accretion Powered X-Ray Sources
• Exact solution for the Green's function describing time-dependent thermal Comptonization
• Revisiting the relativistic ejection event in XTE J1550-564 during the 1998 outburst
• The high energy emission of GRO J1655-40 as revealed with INTEGRAL spectroscopy of the 2005 outburst
• Power-law Tails from Dynamical Comptonization in Converging Flows
• Modeling the Broadband Spectral Energy Distribution of the Microquasars XTE J1550-564 and H 1743-322
• A Disk--Jet interaction model for the X--Ray Variability in Microquasars
• How To Distinguish Neutron Star and Black Hole X-ray Binaries? Spectral index and Quasi-Periodic Oscillation Frequency Correlation