Iron K alpha Evidence for Two X-Ray Reprocessors in MCG -5-23-16

Details Iron K alpha Evidence for Two X-Ray Reprocessors in MCG -5-23-16 Iron K alpha Evidence for Two X-Ray Reprocessors in MCG -5-23-16

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...474..675w&link_type=abstract

Astrophysical Journal v.474, p.675

Astronomy and Astrophysics

Astronomy

38

Galaxies: Individual Alphanumeric: Mcg -5-23-16, Galaxies: Kinematics And Dynamics, Galaxies: Nuclei, Galaxies: Seyfert, Line: Profiles, X-Rays: Galaxies

Scientific paper

We report a remarkable Fe K alpha fluorescence line profile in the Seyfert 1.9 galaxy MCG -5-23-16. The line is complex, consisting of a narrow core located at the galaxy's systemic velocity and wings to the red and blue sides of the core. This represents only the second detection with ASCA of an Fe K alpha line profile with significant broadening blueward of 6.4 keV, consistent with Doppler boosting. The line core has an EW of ~60 eV and the wings have a combined EW of ~200 eV. The entire profile cannot be easily modeled with an emission line predicted from standard accretion disk theories. Instead, the line is marginally triple-peaked and is best described with three Gaussians having rest energies of 5.37^{+0.23}_{-0.19} keV (FWHM = 30,200 km s-1), 6.37 +/- 0.04 keV (FWHM < 6,600 km s-1), and 6.58^{+0.35}_{-0.38} keV (FWHM = 75,300 km s-1). The line can also be modeled with a narrow Gaussian at ~6.4 keV and an emission line from an accretion disk viewed at an inclination angle of ~30 deg to 65 deg, depending on the ionization state of the gas. Within the context of the unified model, the most likely physical description of the complex profile is a superposition of an emission line from an accretion disk and a line that arises far from the disk in either the obscuring torus or the broad line region. This represents the first strong evidence for emission from two distinct X-ray reprocessors within a single Seyfert 1--type galaxy.

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