The mid-infrared emission of a complete sample of Seyfert galaxies

I. García-Bernete, C. Ramos Almeida, J. A. Acosta-Pulido, A. Alonso-Herrero, O. González-Martín, A. Hernán-Caballero, M. Pereira-Santaella, N. A. Levenson, C. Packham, E. S. Perlman, K. Ichikawa, P. Esquej, T. Díaz-Santos

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We present subarcsecond resolution mid-infrared (MIR) images obtained with 8-10 m-class ground-based telescopes of a complete volume-limited (DL <40 Mpc) sample of 24 Seyfert galaxies selected from the Swift/BAT nine month catalog. We use those MIR images to study the nuclear and circumnuclear emission of the galaxies. Using different methods to classify the MIR morphologies on scales of ∼400 pc, we find that the majority of the galaxies (75-83%) are extended or possibly extended and 17-25% are point-like. This extended emission is compact and it has low surface brightness compared with the nuclear emission, and it represents, on average, ∼30 % of the total MIR emission of the galaxies in the sample. We find that the galaxies whose circumnuclear MIR emission is dominated by star formation show more extended emission (650±700pc) than AGN-dominated systems (300±100pc). In general, the galaxies with point-like MIR morphologies are face-on or moderately inclined (b/a ∼0.4-1.0), and we do not find significant differences between the morphologies of Sy1 and Sy2. We used the nuclear and circumnuclear fluxes to investigate their correlation with different AGN and SF activity indicators. We find that the nuclear MIR emission (the inner ∼70 pc) is strongly correlated with the X-ray emission (the harder the X-rays the better the correlation) and with the [OIV] λ25.89 μm emission line, indicating that it is AGN-dominated. We find the same results, although with more scatter, for the circumnuclear emission, which indicates that the AGN dominates the MIR emission in the inner ∼400 pc of the galaxies, with some contribution from star formation.

Original languageEnglish
Title of host publicationProceedings of the 12th Scientific Meeting of the Spanish Astronomical Society - Highlights of Spanish Astrophysics IX, SEA 2016
EditorsS. Arribas, A. Alonso-Herrero, F. Figueras, C. Hernandez-Monteagudo, A. Sanchez-Lavega, S. Perez-Hoyos
PublisherSEA
Pages159-162
Number of pages4
ISBN (Electronic)9788461789313
Publication statusPublished - 2016
Externally publishedYes
Event12th Scientific Meeting of the Spanish Astronomical Society - Highlights of Spanish Astrophysics IX, SEA 2016 - Bilbao, Spain
Duration: 2016 Jul 182016 Jul 22

Publication series

NameProceedings of the 12th Scientific Meeting of the Spanish Astronomical Society - Highlights of Spanish Astrophysics IX, SEA 2016

Conference

Conference12th Scientific Meeting of the Spanish Astronomical Society - Highlights of Spanish Astrophysics IX, SEA 2016
Country/TerritorySpain
CityBilbao
Period16/7/1816/7/22

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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