Modulated X-ray Emissivity near the Stress Edge in Sgr A*

Abstract

Sgr A* is thought to be the radiative manifestation of a ~3.6E6 Msun supermassive black hole at the Galactic center. Its mm/sub-mm spectrum and its flare emission at IR and X-ray wavelengths may be produced within the inner ten Schwarzschild radii of a hot, magnetized Keplerian flow. The lightcurve produced in this region may exhibit quasi-periodic variability. We present ray-tracing simulations to determine the general-relativistically modulated X-ray luminosity expected from plasma coupled magnetically to the rest of the disk as it spirals inwards below the innermost stable circular orbit towards the "stress edge" in the case of a Schwarzschild metric. The resulting lightcurve exhibits a modulation similar to that observed during a recent X-ray flare from Sgr A*.

arXiv comment4 pages, 3 figures, accepted for publication in ApJL

References in corpus (23)

• Viewing the Shadow of the Black Hole at the Galactic Center
• Near-infrared flares from accreting gas around the supermassive black hole at the Galactic Centre
• Rapid X-ray flaring from the direction of the supermassive black hole at the Galactic Centre
• Stellar dynamics in the central arcsecond of our galaxy
• The Nature of the 10 Kilosecond X-ray Flare in Sgr A*
• XMM-Newton observation of the brightest X-ray flare detected so far from SgrA*
• Where is the Inner Edge of an Accretion Disk Around a Black Hole?
• The Flare Activity of SgrA*; New Coordinated mm to X-Ray Observations
• Global MHD Simulations of Cylindrical Keplerian Disks
• Sgr A* Polarization: No ADAF, Low Accretion Rate, and Non-Thermal Synchrotron Emission
• A New X-Ray Flare from the Galactic Nucleus Detected with the XMM-Newton Photon Imaging Cameras
• Polarimetric Imaging of the Massive Black Hole at the Galactic Center
• An Accretion-Induced X-ray Flare in Sgr A*
• Near-infrared polarimetry setting constraints on the orbiting spot model for Sgr A* flares
• Electron Acceleration around the Supermassive Black Hole at the Galactic Center
• Polarized NIR and X-ray Flares from SgrA*
• A Possible Rossby Wave Instability Origin for the Flares in Sagittarius A*
• Repeated X-ray Flaring Activity in Sagittarius A*
• Polarized mm And sub-mm Emission From Sgr A* At The Galactic Center
• A Magnetic Dynamo Origin For The Sub-mm Excess In Sgr A*
• General Relativistic Flux Modulations from Disk Instabilities in Sagittarius A*
• Measuring the Black Hole Spin in Sgr A*
• Iron K-alpha Fluorescent Line Profiles from Spiral Accretion Flows in AGNs

Cited by in corpus (7)

• Evidence for X-ray synchrotron emission from simultaneous mid-IR to X-ray observations of a strong Sgr A* flare
• Tidal effects on small bodies by massive black holes
• Near infrared flares of Sagittarius A*: Importance of near infrared polarimetry
• A magnetohydrodynamic model for multi-wavelength flares from Sagittarius~A${}^{\star }$ (I): model and the near-infrared and X-ray flares
• Polarized Emission of Sagittarius A*
• Analytical time-like geodesics
• Soft gamma-ray constraints on a bright flare from the Galactic Center supermassive black hole