Article (Scientific journals)
LLAMA: Stellar populations in the nuclei of ultra-hard X-ray-selected AGN and matched inactive galaxies
Burtscher, L.; Davies, R.I.; Shimizu, T.T. et al.
2021In Astronomy and Astrophysics, 654, p. 132
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Keywords :
Galaxies: active; Galaxies: evolution; Galaxies: nuclei; Galaxies: Seyfert; Galaxies: stellar content; Techniques: spectroscopic; Active galactic nuclei; Control samples; Galaxies active; Galaxies:Nuclei; Galaxy evolution; Galaxy:seyfert; Galaxy:stellar content; Stars formation; Stellar populations; Astronomy and Astrophysics; Space and Planetary Science; astro-ph.GA
Abstract :
[en] The relation between nuclear (≲ 50 pc) star formation and nuclear galactic activity is still elusive; theoretical models predict a link between the two, but it is unclear whether active galactic nuclei (AGNs) should appear at the same time, before, or after nuclear star formation activity. We present a study of this relation in a complete, volume-limited sample of nine of the most luminous (log L14-195keV > 1042.5 erg s-1) local AGNs (the LLAMA sample), including a sample of 18 inactive control galaxies (six star-forming; 12 passive) that are matched by Hubble type, stellar mass (9.5 ≲ log M∗/M⊙ ≲ 10.5), inclination, and distance. This allows us to calibrate our methods on the control sample and perform a differential analysis between the AGN and control samples. We performed stellar population synthesis on VLT/X-shooter spectra in an aperture corresponding to a physical radius of ≈150 pc. We find young (? 30 Myr) stellar populations in seven out of nine AGNs and in four out of six star-forming control galaxies. In the non-star-forming control population, in contrast, only two out of 12 galaxies show such a population. We further show that these young populations are not indicative of ongoing star formation, providing evidence for models that see AGN activity as a consequence of nuclear star formation. Based on the similar nuclear star formation histories of AGNs and star-forming control galaxies, we speculate that the latter may turn into the former for some fraction of their time. Under this assumption, and making use of the volume completeness of our sample, we infer that the AGN phase lasts for about 5% of the nuclear starburst phase.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Burtscher, L. ;  Leiden Observatory, Leiden, Netherlands
Davies, R.I. ;  Max-Planck-Institut für extraterrestrische Physik, Garching, Germany
Shimizu, T.T. ;  Max-Planck-Institut für extraterrestrische Physik, Garching, Germany
Riffel, R. ;  Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, Porto Alegre-RS, Brazil
Rosario, D.J. ;  Centre for Extragalactic Astronomy, Department of Physics, Durham University, Durham, United Kingdom
Hicks, E.K.S. ;  Department of Physics and Astronomy, University of Alaska Anchorage, Anchorage, United States
Lin, M.-Y.;  Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan
Riffel, R.A. ;  Departamento de Física/CCNE, Universidade Federal de Santa Maria, Santa Maria-RS, Brazil
Schartmann, M.;  OmegaLambdaTec GmbH, Garching, Germany
Schnorr-Müller, A.;  Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, Porto Alegre-RS, Brazil
Storchi-Bergmann, T.;  Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, Porto Alegre-RS, Brazil
Orban De Xivry, Gilles  ;  Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Veilleux, S.;  Department of Astronomy and Joint Space-Science Institute, University of Maryland, College Park, United States
More authors (3 more) Less
Language :
English
Title :
LLAMA: Stellar populations in the nuclei of ultra-hard X-ray-selected AGN and matched inactive galaxies
Publication date :
October 2021
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences
Volume :
654
Pages :
A132
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
L.B. has been partly supported by a DFG grant at the Max-Planck-Institute for Extraterrestrial Physics within the SPP 1573 “Physics of the interstellar medium”. R.R. thanks CNPq, CAPES and FAPERGS for partial financial support. R.A.R. acknowledges financial support from CNPq (302280/2019-7) and FAPERGS (17/2551-0001144-9). D.J.R. acknowledges support from STFC (ST/T000244/1). A.S.M. thanks CNPq for partial financial support.
Commentary :
53 pages, 44 figures, accepted for publication by A&A
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