Synchrotron radiation from radiatively inefficient accretion flow simulations: Applications to sagittarius a

Joshua E. Goldston, Eliot Quataert, Igor V. Igumenshchev

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

We calculate synchrotron radiation in three-dimensional pseudo-Newtonian magnetohydrodynamic simulations of radiatively inefficient accretion flows. We show that the emission is highly variable at optically thin frequencies, with order-of-magnitude variability on timescales as short as the orbital period near the last stable orbit; this emission is linearly polarized at the ∼20%-50% level because of the coherent toroidal magnetic field in the flow. At optically thick frequencies, both the variability amplitude and polarization fraction decrease significantly with decreasing photon frequency. We argue that these results are broadly consistent with the observed properties of Sgr A* at the Galactic center, including the rapid infrared flaring.

Original languageEnglish (US)
Pages (from-to)785-792
Number of pages8
JournalAstrophysical Journal
Volume621
Issue number2 I
DOIs
StatePublished - Mar 10 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Accretion, accretion disks
  • Galaxy: center
  • X-rays: individual (Sagittarius A*)

Fingerprint Dive into the research topics of 'Synchrotron radiation from radiatively inefficient accretion flow simulations: Applications to sagittarius a'. Together they form a unique fingerprint.

  • Cite this