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SLAC Publication: SLAC-PUB-16152
SLAC Release Date: November 20, 2014
The Broad-band X-ray Spectrum of IC 4329A from a Joint NuSTAR/Suzaku Observation
Brenneman, Laura.
We have obtained a deep, simultaneous observation of the bright, nearby Seyfert galaxy IC 4329A with Suzaku and NuSTAR. Through a detailed spectral analysis, we are able to robustly separate the continuum, absorption and distant reflection components in the spectrum. The absorbing column is found to be modest at N_H = 6 \times 10^{21} cm^2, and does not introduce any significant curvature in the Fe K band. We are able to place a strong constraint on the presence of a broadened Fe K{\alpha} line:... Show Full Abstract
We have obtained a deep, simultaneous observation of the bright, nearby Seyfert galaxy IC 4329A with Suzaku and NuSTAR. Through a detailed spectral analysis, we are able to robustly separate the continuum, absorption and distant reflection components in the spectrum. The absorbing column is found to be modest at N_H = 6 \times 10^{21} cm^2, and does not introduce any significant curvature in the Fe K band. We are able to place a strong constraint on the presence of a broadened Fe K{\alpha} line: E = 6.46^{+0.08}_{-0.07} keV rest frame with {\sigma} = 0.33^{+0.08}_{-0.07} keV and EW = 34^{+8}_{-7} eV, though we are not able to constrain any of the parameters of a relativistic reflection model. These results highlight the range in broad Fe K{\alpha} line strengths observed in nearby, bright AGN (roughly an order of magnitude), and imply a corresponding range in the physical properties of the inner accretion disk in these sources. We have also updated our previously reported measurement of the high-energy cutoff of the hard X-ray emission using both observatories rather than just NuSTAR alone: E_{cut} = 186 \pm 14 keV. This high-energy cutoff acts as a proxy for the temperature of the coronal electron plasma, enabling us to further separate this parameter from the optical depth of the plasma and to update our results for these parameters as well. We derive kT = 50^{+6}_{-3} keV with {\tau} = 2.34^{+0.16}_{-0.11} using a spherical geometry, kT = 61 \pm 1 keV with {\tau} = 0.68 \pm 0.02 for a slab geometry, with both having an equivalent goodness-of-fit. Show Partial Abstract
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  • Interest Categories: Astrophysics