The Role of Major Mergers and Nuclear Star Formation in Nearby Obscured Quasars

Abstract

We investigate the triggering mechanism and the structural properties of obscured luminous active galactic nuclei from a detailed study of the rest-frame $B$ and $I$ HST images of 29 nearby ($z\approx 0.04-0.4$) optically selected type 2 quasars. Morphological classification reveals that only a minority (34%) of the hosts are mergers or interacting galaxies. More than half (55%) of the hosts contain regular disks, and a substantial fraction (38%), in fact, are disk-dominated ($B/T\lesssim 0.2$) late-type galaxies with low Sersic indices ($n<2$), which is characteristic of pseudo bulges. The prevalence of bars in the spiral host galaxies may be sufficient to supply the modest fuel requirements needed to power the nuclear activity in these systems. Nuclear star formation seems to be ubiquitous in the central regions, leading to positive color gradients within the bulges and enhancements in the central surface brightness of most systems.

26 pages, 11 figures. Accepted by ApJ

References in corpus (26)

• The propagation of uncertainties in stellar population synthesis modeling I: The relevance of uncertain aspects of stellar evolution and the IMF to the derived physical properties of galaxies
• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• A Semi-Analytic Model for the Co-evolution of Galaxies, Black Holes, and Active Galactic Nuclei
• Structural Properties of Pseudo-Bulges, Classical Bulges and Elliptical Galaxies: an SDSS Perspective
• The 1% Concordance Hubble Constant
• The bulk of the black hole growth since z~1 occurs in a secular universe: No major merger-AGN connection
• The Structure of Classical Bulges And Pseudobulges: The Link Between Pseudobulges And Sersic Index
• Evidence for Quasar Activity Triggered by Galaxy Mergers in HST Observations of Dust-reddened Quasars
• Image Decomposition of Barred Galaxies and AGN Hosts
• HST WFC3/IR Observations of Active Galactic Nucleus Host Galaxies at z~2: Supermassive Black Holes Grow in Disk Galaxies
• Black Holes in Pseudobulges and Spheroidals: A Change in the Black Hole-Bulge Scaling Relations at Low Mass
• GALAPAGOS: From Pixels to Parameters
• The host galaxies of luminous quasars
• Type II Quasars from the Sloan Digital Sky Survey: V. Imaging host galaxies with the Hubble Space Telescope
• The Carnegie-Irvine Galaxy Survey. III. The Three-Component Structure of Nearby Elliptical Galaxies
• Host galaxies of luminous z$\sim$0.6 quasars: Major mergers are not prevalent at the highest AGN luminosities
• The Origin of the Intrinsic Scatter in the Relation Between Black Hole Mass and Bulge Luminosity for Nearby Active Galaxies
• Correlation between Galaxy Mergers and Luminous AGN
• Decomposition of the Host Galaxies of Active Galactic Nuclei Using Hubble Space Telescope Images
• An Optimal Strategy for Accurate Bulge-to-disk Decomposition of Disk Galaxies
• Stellar Photometric Structures of the Host Galaxies of Nearby Type 1 Active Galactic Nuclei
• FERENGI: Redshifting galaxies from SDSS to GEMS, STAGES and COSMOS
• Spitzer Mid-IR Spectroscopy of Powerful 2Jy and 3CRR Radio Galaxies. II. AGN Power Indicators and Unification
• MegaMorph: classifying galaxy morphology using multi-wavelength Sérsic profile fits
• Evidence for a Young Stellar Population in Nearby Type 1 Active Galaxies
• Young stellar populations in type II quasars: timing the onset of star formation and nuclear activity

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• Galaxy interactions are the dominant trigger for local type 2 quasars
• The Carnegie-Irvine Galaxy Survey. IX. Classification of Bulge Types and Statistical Properties of Pseudo Bulges
• Spatially resolved evidence of the impact of quasar driven outflows on recent star formation : The case of Mrk 34
• Lower AGN Abundance in Galaxy Clusters at z < 0.5
• A Hubble Space Telescope Imaging Survey of Low-Redshift Swift-BAT Active Galaxies
• Mid-infrared Variability of Low-redshift Active Galactic Nuclei : Constraints on a Hot Dust Component with a Variable Covering Factor
• A New Channel of Bulge Formation via The Destruction of Short Bars
• Hubble Space Telescope [O III] Emission-Line Kinematics in Two Nearby QSO2s: A Case for X-ray Feedback
• Low-redshift quasars in the SDSS Stripe 82 II: associated companion galaxies and signature of star formation