Modulated x-ray emissivity near the stress edge in sagittarius a

Maurizio Falanga, Fulvio Melia, Martin Prescher, Guillaume Bélanger, Andrea Goldwurm

Research output: Contribution to journalArticle

8 Scopus citations


Sgr A* is thought to be the radiative manifestation of a ∼3.6 × 106 M supermassive black hole at the Galactic center. Its millimeter/submillimeter spectrum and its flare emission at IR and X-ray wavelengths may be produced within the inner 10 Schwarzschild radii of a hot, magnetized Keplerian flow. The light curve 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 inward below the innermost stable circular orbit toward the "stress edge" in the case of a Schwarzschild metric. The resulting light curve exhibits a modulation similar to that observed during a recent X-ray flare from Sgr. A*.

Original languageEnglish (US)
JournalAstrophysical Journal
Issue number2 PART 2
StatePublished - 2008



  • Accretion, accretion disks
  • Black hole physics
  • Galaxy: center
  • Instabilities
  • MHD
  • Plasmas

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Falanga, M., Melia, F., Prescher, M., Bélanger, G., & Goldwurm, A. (2008). Modulated x-ray emissivity near the stress edge in sagittarius a. Astrophysical Journal, 679(2 PART 2).