Unveiling Sizes of Compact AGN Hosts with ALMA

Abstract

We present rest-frame far-infrared (FIR) and optical size measurements of AGN hosts and star-forming galaxies in the COSMOS field, enabled by high-resolution ALMA/1 mm (0.1 arcsec - 0.4 arcsec) and HST/F814W imaging (~ 0.1 arcsec). Our sample includes 27 galaxies at z<2.5, classified as infrared-selected AGN (3 sources), X-ray selected AGN (4 sources), and non-AGN star-forming galaxies (20 sources), for which high-resolution Band 6/7 ALMA images are available at 1 mm from our own observing program as well as archival observations. The sizes and SFR surface densities measured from both ALMA/1 mm and HST/F814W images show that obscured AGN host galaxies are more compact than non-AGN star-forming galaxies at similar redshift and stellar mass. This result suggests that the obscured accretion phase may be related to galaxies experiencing a compaction of their gaseous component, which could be associated with enhanced central star formation before a subsequent quenching driving the formation of compact passive galaxies. Moreover, most of the detected and stacked rest-frame FIR sizes of AGNs in our sample are similar or more compact than their rest-frame optical sizes, which is consistent with recent results of ALMA detected sources. This might be explained by the fact that the dusty starbursts take place in the compact regions, and suggests that the star formation mechanisms in the compact regions of AGN hosts are similar to those observed in star-forming galaxies observed with ALMA.

arXiv commentaccepted for publication in ApJ

References in corpus (71)

• Galactic Stellar and Substellar Initial Mass Function
• The Global Schmidt Law in Star Forming Galaxies
• The physical properties of star forming galaxies in the low redshift universe
• Star Formation in the Milky Way and Nearby Galaxies
• CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey
• CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey - The Hubble Space Telescope Observations, Imaging Data Products and Mosaics
• 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
• Detailed Decomposition of Galaxy Images. II. Beyond Axisymmetric Models
• Cold streams in early massive hot haloes as the main mode of galaxy formation
• The reversal of the star formation-density relation in the distant universe
• Multiwavelength study of massive galaxies at z~2. I. Star formation and galaxy growth
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars
• The COSMOS2015 Catalog: Exploring the 1<z<6 Universe with half a million galaxies
• Detection of quiescent galaxies in a bicolor sequence from z=0-2
• Spectral Energy Distributions of Hard X-ray selected AGNs in the XMDS Survey
• Constraining the Low-Mass Slope of the Star Formation Sequence at 0.5<z<2.5
• The Herschel view of the dominant mode of galaxy growth from z=4 to the present day
• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions
• Compaction and Quenching of High-z Galaxies in Cosmological Simulations: Blue and Red Nuggets
• Structural Parameters of Galaxies in CANDELS
• The Chandra COSMOS Legacy survey: overview and point source catalog
• An ALMA survey of Sub-millimeter Galaxies in the Extended Chandra Deep Field South: Physical properties derived from ultraviolet-to-radio modelling
• Defining the intrinsic AGN infrared spectral energy distribution and measuring its contribution to the infrared output of composite galaxies
• The bulk of the black hole growth since z~1 occurs in a secular universe: No major merger-AGN connection
• CANDELS: Constraining the AGN-Merger Connection with Host Morphologies at z~2
• The Confinement of Star-Forming Galaxies into a Main Sequence through Episodes of Gas Compaction, Depletion, and Replenishment
• Smooth(er) Stellar Mass Maps in CANDELS: Constraints on the Longevity of Clumps in High-redshift Star-forming Galaxies
• The Chandra COSMOS Legacy survey: optical/IR identifications
• The Space Density of Compton Thick AGN and the X-ray Background
• Kiloparsec-scale dust disks in high-redshift luminous submillimeter galaxies
• High-redshift clumpy discs and bulges in cosmological simulations
• Dissecting Photometric redshift for Active Galactic Nuclei using XMM- and Chandra-COSMOS samples
• Stellar Masses and SFRs for 1M Galaxies from SDSS and WISE
• GOODS-Herschel: The far-infrared view of star formation in AGN host galaxies since z~3
• The SCUBA-2 Cosmology Legacy Survey: ALMA resolves the rest-frame far-infrared emission of sub-millimeter galaxies
• Black hole evolution: I. Supernova-regulated black hole growth
• AGN Host Galaxy Morphologies in COSMOS
• Compact starbursts in z~3-6 submillimeter galaxies revealed by ALMA
• The SCUBA-2 Cosmology Legacy Survey: ALMA resolves the bright-end of the sub-millimeter number counts
• The impact of galaxy interactions on AGN activity in zCOSMOS
• GOODS-Herschel and CANDELS: The Morphologies of Ultraluminous Infrared Galaxies at z~2
• Starbursts in and out of the star-formation main sequence
• Morphologies of z~0.7 AGN Host Galaxies in CANDELS: No trend of merger incidence with AGN luminosity
• Sub-kpc ALMA imaging of compact star-forming galaxies at z~2.5: revealing the formation of dense galactic cores in the progenitors of compact quiescent galaxies
• No clear submillimetre signature of suppressed star formation amongst X-ray luminous AGNs
• An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South: Near-infrared morphologies and stellar sizes
• VLA and ALMA Imaging of Intense, Galaxy-Wide Star Formation in z ~ 2 Galaxies
• Host galaxies of luminous z$\sim$0.6 quasars: Major mergers are not prevalent at the highest AGN luminosities
• Do the Most Massive Black Holes at $z=2$ Grow via Major Mergers?
• PHIBSS2: survey design and z=0.5-0.8 results. Molecular gas reservoirs during the winding-down of star formation
• Widespread and Hidden Active Galactic Nuclei in Star-Forming Galaxies at Redshift > 0.3
• Nuclear Activity is more prevalent in Star-Forming Galaxies
• Demonstrating A New Census of INfrared Galaxies with ALMA (DANCING-ALMA). I. FIR Size and Luminosity Relation at z = 0-6 Revealed with 1034 ALMA Sources
• The spectral energy distribution of the central parsecs of the nearest AGN
• An Observed Link between Active Galactic Nuclei and Violent Disk Instabilities in High-Redshift Galaxies
• Black hole accretion and host galaxies of obscured quasars in XMM-COSMOS
• The ALMA Frontier Fields survey I: 1.1 mm continuum detections in Abell 2744, MACSJ0416.1-2403 and MACSJ1149.5+2223
• Rotating starburst cores in massive galaxies at z=2.5
• Revealing the Stellar Mass and Dust Distributions of Submillimeter Galaxies at Redshift 2
• Infrared Selection of Obscured Active Galactic Nuclei in the COSMOS Field
• ALMA 26 Arcmin${}^2$ Survey of GOODS-S at One-millimeter (ASAGAO): Average Morphology of High-$z$ Dusty Star-Forming Galaxies is an Exponential-Disk ($n\simeq 1$)
• An imperfectly passive nature: Bright sub-millimeter emission from dust-obscured star formation in the z=3.717 "passive" system, ZF20115
• Stacking of large interferometric data sets in the image- and uv-domain -- a comparative study
• Obscured Active Galactic Nuclei triggered in compact star-forming galaxies
• ALMA resolves extended star formation in high-z AGN host galaxies
• Structure and morphology of X-ray selected AGN hosts at 1<z<3 in CANDELS-COSMOS field
• Local Swift-BAT active galactic nuclei prefer circumnuclear star formation

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• The ALMA-ALPAKA survey I: high-resolution CO and [CI] kinematics of star-forming galaxies at z = 0.5-3.5
• A${}^3$COSMOS: A census on the molecular gas mass and extent of main-sequence galaxies across cosmic time
• A Comparison of the Stellar, CO and Dust-Continuum Emission from Three, Star-Forming HUDF Galaxies at $z\sim 2$
• SUPER V. ALMA continuum observations of z~2 AGN and the elusive evidence of outflows influencing star formation
• A Spatially-Resolved Survey of Distant Quasar Host Galaxies: I. Dynamics of galactic outflows
• The impact of ionised outflows from z$\sim$2.5 quasars is not through instantaneous in-situ quenching: the evidence from ALMA and VLT/SINFONI
• CEERS: MIRI deciphers the spatial distribution of dust-obscured star formation in galaxies at $0.1<z<2.5$
• PRIMER: JWST/MIRI reveals the evolution of star-forming structures in galaxies at z<2.5