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• W2031211037 endingPage "81" @default.
• W2031211037 startingPage "81" @default.
• W2031211037 abstract "The Circinus galaxy is one of the nearest obscured AGN, making it an ideal target for detailed study. Combining archival Chandra and XMM-Newton data with new NuSTAR observations, we model the 2-79 keV spectrum to constrain the primary AGN continuum and to derive physical parameters for the obscuring material. Chandra's high angular resolution allows a separation of nuclear and off-nuclear galactic emission. In the off-nuclear diffuse emission we find signatures of strong cold reflection, including high equivalent-width neutral Fe lines. This Compton-scattered off-nuclear emission amounts to 18% of the nuclear flux in the Fe line region, but becomes comparable to the nuclear emission above 30 keV. The new analysis no longer supports a prominent transmitted AGN component in the observed band. We find that the nuclear spectrum is consistent with Compton-scattering by an optically-thick torus, where the intrinsic spectrum is a powerlaw of photon index $Gamma = 2.2-2.4$, the torus has an equatorial column density of $N_{rm H} = (6-10)times10^{24}$cm$^{-2}$ and the intrinsic AGN $2-10$ keV luminosity is $(2.3-5.1)times 10^{42}$ erg/s. These values place Circinus along the same relations as unobscured AGN in accretion rate-vs-$Gamma$ and $L_X$-vs-$L_{IR}$ phase space. NuSTAR's high sensitivity and low background allow us to study the short time-scale variability of Circinus at X-ray energies above 10 keV for the first time. The lack of detected variability favors a Compton-thick absorber, in line with the the spectral fitting results." @default.
• W2031211037 created "2016-06-24" @default.
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• W2031211037 date "2014-07-30" @default.
• W2031211037 modified "2023-10-11" @default.
• W2031211037 title "THE 2-79 keV X-RAY SPECTRUM OF THE CIRCINUS GALAXY WITH<i>NuSTAR</i>,<i>XMM-Newton</i>, AND<i>CHANDRA</i>: A FULLY COMPTON-THICK ACTIVE GALACTIC NUCLEUS" @default.
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• W2031211037 doi "https://doi.org/10.1088/0004-637x/791/2/81" @default.
• W2031211037 hasPublicationYear "2014" @default.
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