Multiwavelength Analysis of a Nearby Heavily Obscured AGN in NGC 449

Abstract

We present 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 (≃10²⁴ cm^-2) and photon index (Γ ≃ 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 spectrum and spectral energy distribution fitting, we derived its intrinsic X-ray luminosity (≃8.54 × 10⁴² erg s^-1) and scattering fraction (f _scat ≃ 0.26%). In addition, we also derived the following results. (1) The mass accretion rate of the central AGN is about 2.54 × 10^-2 M _⊙ yr^-1, and the Eddington ratio is 8.39 × 10^-2. (2) The torus of this AGN has a high gas-to-dust ratio (N _H/A _V = 8.40 × 10²² cm^-2 mag^-1). (3) The host galaxy and central AGN are both in the early stage of coevolution.