Physical properties of AGN host galaxies as a probe of SMBH feeding mechanisms

Abstract

Using an advanced semi analytic model (SAM) for galaxy formation, we have investigated the statistical effects of assuming two different mechanisms for triggering AGN activity on the properties of AGN host galaxies. We have considered a first accretion mode where AGN activity is triggered by disk instabilities (DI) in isolated galaxies, and a second feeding mode where such an activity is triggered by galaxy mergers and fly-by events (interactions, IT). We obtained the following results:i) for hosts with $M_{\ast }\lesssim 10^{11}{M}_{⨀}$, both DI and IT modes are able to account for the observed AGN hosts stellar mass function; for more massive hosts, the DI scenario predicts a lower space density than the IT model, lying below the observational estimates for z>0.8.ii) The analysis of the color-magnitude diagram (CMD) of AGN hosts for redshift z < 1.5 can provide a good observational test to effectively discriminate between the DI and IT mode, since DIs are expected to yield AGN host galaxy colors skewed towards bluer colors, while in the IT scenario the majority of hosts are expected to reside in the red sequence.iii) While both IT and DI scenarios can account for AGN triggered in main sequence or starburst galaxies, DIs fail in triggering AGN activity in passive galaxies.iv) The two modes are characterized by a different duration of the AGN phase, with DIs lasting even on time scales $\sim$ Gyr, much longer with respect to the IT scenario.v) The scatter of the $SFR-L_{bol}$ relation could represent another crucial diagnostics to discriminate between the two triggering modes, since the DI scenario predicts an appreciably lower scatter of the relation than the IT scenario. vi) Disk instabilities are not able to account for the observed fraction of AGN in groups for z < 1 and clusters for z < 0.7, while the IT scenario provides a good match to observational data.

Paper accepted for publication in section 4. Extragalactic astronomy of Astronomy and Astrophysics

References in corpus (28)

• The Cosmic Evolution Survey (COSMOS) -- Overview
• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• UV Star Formation Rates in the Local Universe
• The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
• An Observational Determination of the Bolometric Quasar Luminosity Function
• Toward the Standard Population Synthesis Model of the X-Ray Background: Evolution of X-Ray Luminosity and Absorption Functions of Active Galactic Nuclei Including Compton-Thick Populations
• The effect of galaxy mass ratio on merger--driven starbursts
• A Close Look at Star Formation around Active Galactic Nuclei
• Kinematic Structure of Merger Remnants
• The XMM-Newton wide-field survey in the COSMOS field: I. Survey description
• Formation of z ~ 6 quasars from hierarchical galaxy mergers
• The Mean Star Formation Rate of X-ray selected Active Galaxies and its Evolution from z=2.5: Results from PEP-Herschel
• The XMM-Newton wide-field survey in the COSMOS field. The point-like X-ray source catalogue
• AEGIS: The color-magnitude relation for X-ray selected AGN
• The Blast Wave Model for AGN Feedback: Effects on AGN Obscuration
• The Subaru/XMM-Newton Deep Survey (SXDS): III. X-Ray Data
• Cosmic Evolution of Mass Accretion Rate and Metalicity in Active Galactic Nuclei
• The VVDS type-1 AGN sample: The faint end of the luminosity function
• The evolution of the specific star formation rate of massive galaxies to z ~ 1.8 in the E-CDFS
• A Multiwavelength Consensus on the Main Sequence of Star-Forming Galaxies at z~2
• AEGIS: Host Galaxy Morphologies of X-ray and Infrared-selected AGN at 0.2 < z < 1.2
• The Evolution of Active Galactic Nuclei in Clusters of Galaxies to Redshift 1.3
• Chandra Observations of the Highest Redshift Quasars from the Sloan Digital Sky Survey
• Triggering Active Galactic Nuclei in Hierarchical Galaxy Formation: Disk instability vs. Interactions
• Dust-Corrected Colors Reveal Bimodality in AGN Host Galaxy Colors at z~1
• First Measurement of a Rapid Increase in the AGN Fraction in High-Redshift Clusters of Galaxies
• The XMM-Newton survey of the ELAIS-S1 field. I: Number counts, angular correlation function and X-ray spectral properties

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• Observational Constraints on the Feeding of Supermassive Black Holes
• The Chandra COSMOS Legacy survey: the z>3 sample
• Extragalactic gamma-ray background from AGN winds and star-forming galaxies in cosmological galaxy formation models
• Circumnuclear Structures in Megamaser Host Galaxies
• Astrophysics with the Laser Interferometer Space Antenna
• The detections of inflowing gas from narrow absorption lines at the parsec scale
• A study of interacting galaxies from the Arp-Madore Catalogue: Triggering of star formation and nuclear activity
• Compton-thick AGN Characterisation in a Multi-wavelength Context: Insights from the 70-Month \textit{SWIFT}/BAT Catalogue