Issue |
A&A
Volume 573, January 2015
|
|
---|---|---|
Article Number | A85 | |
Number of page(s) | 24 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361/201423782 | |
Published online | 23 December 2014 |
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⋆,⋆⋆
1
Max-Planck-Institut für Extraterrestrische Physik (MPE),
Postfach 1312,
85741
Garching,
Germany
2
Department of Physics & Astronomy, University of
Missouri-Kansas City, 5110 Rockhill
Rd., Kansas City,
MO
64110,
USA
3
Max-Planck Institut für Astronomie, Königstuhl 17, 69117
Heidelberg,
Germany
4
National Optical Astronomy Observatory,
950 N. Cherry Ave.,
Tucson, AZ
85719,
USA
5
INAF–Osservatorio Astronomico di Roma, via di Frascati 33,
00040
Monte Porzio Catone,
Italy
6
Infrared Processing and Analysis Center, California Institute of
Technology, Pasadena,
CA,
USA
7
Department of Physics, Durham University,
South Road, Durham
DH1 3LE,
UK
8
Instituto de Astrofísica, Facultad de Física, Pontificia
Universidad Catòlica de Chile, 306, Santiago 22,
Chile
9
Department of Astronomy, University of Michigan,
500 Church St., Ann Arbor, MI
48109,
USA
10
Department of Astronomy & Astrophysics, The Pennsylvania
State University, University Park, Pennsylvania, PA
16802,
USA
11
The School of Physics and Astronomy, University of Nottingham,
Nottingham,
UK
12
Racah Institute of Physics, The Hebrew University,
Jerusalem,
Israel
13
University of California Observatories/Lick Observatory,
University of California, Santa
Cruz, CA
95064,
USA
14
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD
21218,
USA
15
Department of Physics and Astronomy, University of
Kentucky, Lexington
KY
40506-0055,
USA
16
Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121
Bonn,
Germany
17
Kavli Institute for Cosmology, University of Cambridge,
Madingley Road, Cambridge
CB3, OHA,
UK
18
Cavendish Laboratory, University of Cambridge,
19 JJ Thomson Avenue, Cambridge,
CB3, OHE,
UK
19
Department of Physics and Astronomy, University
ofSheffield, Hounsfield
Road, Sheffield
S3 7RH,
UK
20
Department of Physics and Astronomy, Texas A&M
University, College
Station, TX,
USA
21
Exzellenzcluster Universe, Technische Universität München,
Boltzmannstrasse 2,
85748
Garching,
Germany
22
SUPA, School of Physics and Astronomy, University of St. Andrews,
North Haugh, St.
Andrews, Fife
KY16 9SS,
UK
23
Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, Colorado
80301,
USA
24
Centre for Astrophysics & Supercomputing, Swinburne
University of Technology, PO Box
218, Hawthorn,
VIC
3122,
Australia
25
Laboratoire AIM-Paris-Saclay, CEA/DSM/Irfu - CNRS - Université
Paris Diderot, CE-Saclay, 91191
Gif-sur-Yvette,
France
26
Instituto de Fisica y Astronomía, Facultad de Ciencias,
Universidad de Valparaíso, Gran
Bretaña 1111, Playa Ancha, Valparaíso, Chile
27
Los Alamos National Laboratory, Los Alamos
NM
87545,
USA
28
Department of Physics and Astronomy, University of
California, Riverside, CA
92521,
USA
29
Institute for Astronomy, ETH Zurich, Wolgang-Pauli-Strasse 27,
8093
Zurich,
Switzerland
30
Aix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique
de Marseille) UMR 7326, 13388
Marseille,
France
31
School of Mathematics, Statistics & Computer Science,
University of KwaZulu-Natal, 4041
Durban, South
Africa
32
Department of Physics and Astronomy, Colby College, Waterville, ME
04901,
USA
33
Institute for Astronomy, University of Hawaii, 2680 Woodlawn
Drive, Honolulu,
HI
96822,
USA
34
Department of Physics and Astronomy, Macalester College, 1600 Grand Avenue,
Saint Paul, MN
55105,
USA
35
Department of Physics and Astronomy, Johns Hopkins
University, 3400 North Charles
Street, Baltimore,
MD
21218,
USA
36
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge,
MA
02138,
USA
37
NASA Goddard Space Flight Center, Greenbelt, MD
16418,
USA
38
Astronomy Department, 3910 15th Ave NE, University of
Washington, Seattle,
WA
98195,
USA
39
Department of Astronomy, University of Florida,
211 Bryant Space Science Center,
Gainesville, FL
32611-2055,
USA
Received: 7 March 2014
Accepted: 2 October 2014
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.
Key words: galaxies: active / galaxies: structure / galaxies: star formation / surveys / methods: statistical / X-rays: galaxies
Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
Appendices are available in electronic form at http://www.aanda.org
© ESO, 2014
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