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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

Rosario, D.J.; McIntosh, D.H.; van der Wel, A.; Kartaltepe, J.; Lang, P.; Santini, P.; Wuyts, S.; Lutz, D.; Rafelski, M.; Villforth, C.; Alexander, D.M.; Bauer, F.E.; Bell, E.F.; Berta, S.; Brandt, W.N.; Conselice, C.J.; Dekel, A.; Faber, S.M.; Ferguson, H.C.; Genzel, R.; Grogin, N.A.; Kocevski, D.D.; Koekemoer, A.M.; Koo, D.C.; Lotz, J.M.; Magnelli, B.; Maiolino, R.; Mozena, M.; Mullaney, J.R.; Papovich, C.J.; Popesso, P.; Tacconi, L.J.; Trump, J.R.; Avadhuta, S.; Bassett, R.; Bell, A.; Bernyk, M.; Bournaud, F.; Cassata, P.; Cheung, E.; Croton, D.; Donley, J.; DeGroot, L.; Guedes, J.; Hathi, N.; Herrington, J.; Hilton, M.; Lai, K.; Lani, C.; Martig, M.; McGrath, E.; Mutch, S.; Mortlock, A.; McPartland, C.; O'Leary, E.; Peth, M.; Pillepich, A.; Poole, G.; Snyder, D.; Straughn, A.; Telford, O.; Tonini, C.; Wandro, P.

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 Thumbnail


D.J. Rosario

D.H. McIntosh

A. van der Wel

J. Kartaltepe

P. Lang

P. Santini

S. Wuyts

D. Lutz

M. Rafelski

C. Villforth

F.E. Bauer

E.F. Bell

S. Berta

W.N. Brandt

C.J. Conselice

A. Dekel

S.M. Faber

H.C. Ferguson

R. Genzel

N.A. Grogin

D.D. Kocevski

A.M. Koekemoer

D.C. Koo

J.M. Lotz

B. Magnelli

R. Maiolino

M. Mozena

J.R. Mullaney

C.J. Papovich

P. Popesso

L.J. Tacconi

J.R. Trump

S. Avadhuta

R. Bassett

A. Bell

M. Bernyk

F. Bournaud

P. Cassata

E. Cheung

D. Croton

J. Donley

L. DeGroot

J. Guedes

N. Hathi

J. Herrington

M. Hilton

K. Lai

C. Lani

M. Martig

E. McGrath

S. Mutch

A. Mortlock

C. McPartland

E. O'Leary

M. Peth

A. Pillepich

G. Poole

D. Snyder

A. Straughn

O. Telford

C. Tonini

P. Wandro


We study the relationship between the structure and star formation rate (SFR) of X-ray selected low and moderate luminosity active galactic nuclei (AGNs) in the two Chandra Deep Fields, using Hubble Space Telescope imaging from the Cosmic Assembly Near Infrared Extragalactic Legacy Survey (CANDELS) and deep far-infrared maps from the PEP+GOODS-Herschel survey. We derive detailed distributions of structural parameters and FIR luminosities from carefully constructed control samples of galaxies, which we then compare to those of the AGNs. At z ~ 1, AGNs show slightly diskier light profiles than massive inactive (non-AGN) galaxies, as well as modestly higher levels of gross galaxy disturbance (as measured by visual signatures of interactions and clumpy structure). In contrast, at z ~ 2, AGNs show similar levels of galaxy disturbance as inactive galaxies, but display a red central light enhancement, which may arise from a more pronounced bulge in AGN hosts or extinguished nuclear light. We undertake a number of tests of both these alternatives, but our results do not strongly favor one interpretation over the other. The mean SFR and its distribution among AGNs and inactive galaxies are similar at z> 1.5. At z< 1, however, clear and significant enhancements are seen in the SFRs of AGNs with bulge-dominated light profiles. These trends suggest an evolution in the relation between nuclear activity and host properties with redshift, towards a minor role for mergers and interactions at z> 1.5.

Journal Article Type Article
Acceptance Date Oct 2, 2014
Publication Date Jan 1, 2015
Deposit Date May 15, 2015
Publicly Available Date May 20, 2015
Journal Astronomy and astrophysics.
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 573
Article Number A85
Keywords Galaxies: active, Galaxies: structure, Galaxies: star formation, Surveys, Methods: statistical, X-rays: galaxies.
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Copyright Statement
Reproduced with permission from Astronomy & Astrophysics, © ESO, 2014.

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