Hubble Space Telescope Imaging in the Chandra Deep Field South: III. Quantitative Morphology of the 1Ms Chandra Counterparts and Comparison with the Field Population

Abstract

We present quantitative morphological analyses of 37 HST/WFPC2 counterparts of X-ray sources in the 1 Ms Chandra Deep Field-South (CDFS). We investigate: 1) 1-D surface brightness profiles via isophotal ellipse fitting; 2) 2-D, PSF- convolved, bulge+disk+nucleus profile-fitting; 3) asymmetry and concentration indices compared with all ~3000 sources in our three WFPC2 fields; and 4) near- neighbor analyses comparing local environments of X-ray sources versus the field control sample. Significant nuclear point-source optical components appear in roughly half of the resolved HST/WFPC2 counterparts, showing a narrow range of F_X/F_{opt,nuc} consistent with the several HST-unresolved X-ray sources (putative type-1 AGN) in our fields. We infer roughly half of the HST/WFPC2 counterparts host unobscured AGN, which suggests no steep decline in the type-1/type-2 ratio out to the redshifts z~0.5-1 typical of our sources. The concentration indices of the CDFS counterparts are clearly larger on average than those of the field distribution, at 5-sigma, suggesting that the strong correlation between central black hole mass and host galaxy properties (including concentration index) observed in nearby galaxies is already evident by z~0.5-1. By contrast, the asymmetry index distribution of the 21 resolved CDFS sources at I<23 is indistinguishable from the I<23 field. Moreover, the frequency of I<23 near neighbors around the CDFS counterparts is not significantly different from the field sample. These results, combined with previous similar findings for local samples, suggest that recent merger/ interaction history is not a good indicator of AGN activity over a substantial range of look-back time.

arXiv comment30 pages, incl. 8 figures; accepted for publication in the Astrophysical Journal

References in corpus (26)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• A Fundamental Relation Between Supermassive Black Holes and Their Host Galaxies
• The Demography of Massive Dark Objects in Galaxy Centres
• A Relationship Between Nuclear Black Hole Mass and Galaxy Velocity Dispersion
• Drizzle: A Method for the Linear Reconstruction of Undersampled Images
• The Chandra Deep Field South: the 1 Million Second
• The Asymmetry of Galaxies: Physical Morphology for Nearby and High Redshift Galaxies
• Resolving the extragalactic hard X-ray background
• Quantifying the Fragility of Galactic Disks in Minor Mergers
• Structural and Photometric Classification of Galaxies - I. Calibration Based on a Nearby Galaxy Sample
• The Chandra Deep Field North Survey. V. 1 Ms Source Catalogs
• A Correlation between Galaxy Light Concentration and Supermassive Black Hole Mass
• Tidally-Triggered Star Formation in Close Pairs of Galaxies
• WFPC2 Observations of the Hubble Deep Field-South
• The Chandra Deep Survey of the Hubble Deep Field North Area. II. Results from the Caltech Faint Field Galaxy Redshift Survey Area
• Hubble Space Telescope imaging of the CFRS and LDSS redshift surveys II: Structural parameter and the evolution of disk galaxies to z=1
• The Great Observatories Origins Deep Survey
• New Results from the X-ray and Optical Survey of the Chandra Deep Field South: The 300ks Exposure
• Testing current synthesis models of the X-ray background
• The Redshift Evolution of the 2-8 keV X-ray Luminosity Function
• The Evolution of Barred Spiral Galaxies in the Hubble Deep Fields North and South
• The Frequency of Active and Quiescent Galaxies with Companions: Implications for the Feeding of the Nucleus
• X-ray properties of Red Active Galactic Nuclei
• A blind HI survey of the M81 group
• The Minor-Merger Driven Nuclear Activity in Seyfert Galaxies: A Step toward the Simple Unified Formation Mechanism of Active Galactic Nuclei in the Local Universe
• HST Imaging in the Chandra Deep Field South: II. WFPC2 Observations of an X-Ray Flux-Limited Sample from the 1 Msec Chandra Catalog

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• The Cosmic Evolution of Hard X-ray Selected Active Galactic Nuclei
• The bulk of the black hole growth since z~1 occurs in a secular universe: No major merger-AGN connection
• The Fall of AGN and the Rise of Star-Forming Galaxies: A Close Look at the Chandra Deep Field X-ray Number Counts
• AGN Host Galaxies at z~0.4-1.3 : Bulge-dominated and Lacking Merger-AGN Connection
• AEGIS: Host Galaxy Morphologies of X-ray and Infrared-selected AGN at 0.2 < z < 1.2
• The role of AGN in the colour transformation of galaxies at redshifts z~1
• UV light from young stars in GEMS quasar host galaxies at 1.8<z<2.75
• Galaxy gas as obscurer: II. Separating the galaxy-scale and nuclear obscurers of Active Galactic Nuclei
• How are AGN Found?
• The host galaxies of X-ray selected Active Galactic Nuclei to z=2.5: Structure, star-formation and their relationships from CANDELS and Herschel/PACS
• The importance of galaxy interactions in triggering type II quasar activity
• The Spatial Clustering of Low Luminosity AGN
• Are red 2MASS QSOs young?
• Obscured GOODS AGN and Their Host Galaxies at z < 1.25: The Slow Black Hole Growth Phase
• Host galaxy colour gradients and accretion disc obscuration in AEGIS z~1 X-ray-selected active galactic nuclei
• Testing the starburst/AGN connection with SWIRE X-ray/70 micron sources
• OTELO Survey: Deep BVRI broadband photometry of the Groth strip. II Properties of X-ray Emitters
• Properties of Galaxies Hosting X-ray Selected Active Galactic Nuclei in the Cl1604 Supercluster at z=0.9
• XMM-Newton Surveys of the Canada-France Redshift Survey Fields - III: The Environments of X-ray Selected AGN at 0.4<z<0.6
• The Effects of an AGN on Host Galaxy Colour and Morphology Measurements
• Structure and Evolution of Starburst and Normal Galaxies
• Red AGN in XMM-Newton/SDSS fields
• On the Anticorrelation Between Galaxy Light Concentration and X-ray-to-Optical Flux Ratio
• Near-Infrared Properties of Faint X-rays Sources from NICMOS Imaging in the Chandra Deep Fields
• Calibrating X-ray binary luminosity functions via optical reconnaissance II. The high-mass XLF and globular cluster population of X-ray binaries in the low star-forming spiral M81
• The Galaxy Structure-Redshift Relationship