An off-centered active galactic nucleus in NGC 3115

Abstract

NGC 3115 is an S0 galaxy that has always been considered to have a pure absorption-line spectrum. Some recent studies have detected a compact radio-emitting nucleus in this object, coinciding with the photometric center and with a candidate for the X-ray nucleus. This is evidence of the existence of a low-luminosity active galactic nucleus (AGN) in the galaxy, although no emission line has ever been observed. We report the detection of an emission-line spectrum of a type 1 AGN in NGC 3115, with an H$\alpha$ luminosity of $L_{H\alpha }=(4.2\pm 0.4)\times 10^{37}$ erg s${}^{-1}$. Our analysis revealed that this AGN is located at a projected distance of $\sim 0.29"\pm 0.05"$ (corresponding to $\sim 14.3\pm 2.5$ pc) from the stellar bulge center, which is coincident with the kinematic center of this object's stellar velocity map. The black hole corresponding to the observed off-centered AGN may form a binary system with a black hole located at the stellar bulge center. However, it is also possible that the displaced black hole is the merged remnant of the binary system coalescence, after the "kick" caused by the asymmetric emission of gravitational waves. We propose that certain features in the stellar velocity dispersion map are the result of perturbations caused by the off-centered AGN.

14 pages, 5 figures

References in corpus (16)

• Stellar population synthesis at the resolution of 2003
• Parametric Recovery of Line-of-Sight Velocity Distributions from Absorption-Line Spectra of Galaxies via Penalized Likelihood
• MILES: A Medium resolution INT Library of Empirical Spectra
• A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies
• Nuclear Activity in Nearby Galaxies
• A Search for "Dwarf" Seyfert Nuclei. IV. Nuclei with Broad H-alpha Emission
• Massive Black Hole Binary Evolution
• Mass Deficits, Stalling Radii, and the Merger Histories of Elliptical Galaxies
• A census of X-ray nuclear activity in nearby galaxies
• Differential stellar population models: how to reliably measure [Fe/H] and [alpha/Fe] in galaxies
• Binary black hole merger gravitational waves and recoil in the large mass ratio limit
• Resolving the Bondi Accretion Flow toward the Supermassive Black Hole of NGC 3115 with Chandra
• The Megasecond Chandra XVP Observation of NGC 3115: Witnessing the Flow of Hot Gas within the Bondi Radius
• A treatment procedure for Gemini North/NIFS data cubes: application to NGC 4151
• Discovery of a Flat-Spectrum Radio Nucleus in NGC 3115
• Mapping low and high density clouds in astrophysical nebulae by imaging forbidden line emission

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• The DIVING${}^{3D}$ Survey - Deep IFS View of Nuclei of Galaxies - III. Analysis of the nuclear region of the early-type galaxies of the sample
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• Evaluating the efficacy of a data cube treatment procedure for kinematic analyses: application to NGC 3115 and NGC 4699