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Hisamitsu Awaki, Yuichi Terashima, Yuusuke Higaki, Yasushi Fukazawa, Detection of Hard X-Rays from the Compton-Thick Seyfert 2 Galaxy NGC 2273 with Suzaku, Publications of the Astronomical Society of Japan, Volume 61, Issue sp1, 30 January 2009, Pages S317–S325, https://doi.org/10.1093/pasj/61.sp1.S317
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Abstract
We have obtained a broad-band spectrum of the Compton-thick Seyfert 2 galaxy NGC 2273 with Suzaku. The spectrum reveals the first detection of hard X-rays above |$\sim$|10 keV from NGC 2273. The broad-band spectrum is well represented by a three component model, accompanied by both a strong iron K|$\alpha$| line with an equivalent width of |$\sim$|1.8 keV and several weak lines. The three component model consists of a soft component, a reflection component from cold matter, and an absorbed power law component. The soft component can be represented by thin thermal emission with |$kT$||$\sim$| 0.56 keV or by a scattered component with a scattering fraction of 0.4%. Fixing the photon indices of the power law and reflection components at 1.9, we found that the power law component, heavily absorbed by gas with a column density of |$\sim$|1.5 |$\times$| 10|$^{24}$|cm|$^{-2}$|, has an intrinsic 2–10 keV luminosity of |$\sim$|1.7 |$\times$| 10|$^{42}$|ergs|$^{-1}$|. We also applied a reflection model based on a Monte Carlo simulation, assuming a simple torus geometry. We found that the model fits the broad band spectrum well, and we placed some tentative constraints on the geometry of the putative torus in NGC 2273.
