Multiwavelength Analysis of a Nearby Heavily Obscured AGN in NGC 449

Abstract

We presented the multiwavelength analysis of a heavily obscured active galactic nucleus (AGN) in NGC 449. We first constructed a broadband X-ray spectrum using the latest NuSTAR and XMM-Newton data. Its column density ($\simeq 10^{24}{\mathrm{cm}}^{-2}$) and photon index ($\Gamma \simeq 2.4$) were reliably obtained by analyzing the broadband X-ray spectrum. However, the scattering fraction and the intrinsic X-ray luminosity could not be well constrained. Combined with the information obtained from the mid-infrared (mid-IR) spectrum and spectral energy distribution (SED) fitting, we derived its intrinsic X-ray luminosity ($\simeq 8.54\times 10^{42}{\mathrm{erg}\mathrm{s}}^{-1}$) and scattering fraction ($f_{\mathrm{scat}}\simeq 0.26\%$). In addition, we also derived the following results: (1). The mass accretion rate of central AGN is about $2.54\times 10^{-2}{\mathrm{M}}_{\odot }{\mathrm{yr}}^{-1}$, and the Eddington ratio is $8.39\times 10^{-2}$; (2). The torus of this AGN has a high gas-to-dust ratio ($N_{\mathrm{H}}/A_{\mathrm{V}}=8.40\times 10^{22}{\mathrm{cm}}^{-2}{\mathrm{mag}}^{-1}$); (3). The host galaxy and the central AGN are both in the early stage of co-evolution.

12 pages, 5 figures, 3 tables, Accepted to PASP

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