TY - JOUR
T1 - The nuclear and extended mid-infrared emission of Seyfert galaxies
AU - García-Bernete, I.
AU - Ramos Almeida, C.
AU - Acosta-Pulido, J. A.
AU - Alonso-Herrero, A.
AU - González-Martín, O.
AU - Hernán-Caballero, A.
AU - Pereira-Santaella, M.
AU - Levenson, N. A.
AU - Packham, C.
AU - Perlman, E. S.
AU - Ichikawa, K.
AU - Esquej, P.
AU - Díaz-Santos, T.
N1 - Funding Information:
IGB acknowledges financial support from the Instituto de Astrof ísica de Canarias through Fundacion La Caixa. This research was partly supported by a Marie Curie Intra European Fellowship within the 7th European Community Framework Programme (PIEF-GA-2012-327934). CRA and IGB acknowledge financial support from the Spanish Ministry of Science and Innovation (MICINN) through project PN AYA2013-47742-C4-2-P. CRA also acknowledges the Ramón y Cajal Program of the Spanish Ministry of Economy and Competitiveness. AA-H and AHC acknowledges financial support from the Spanish Ministry of Economy and Competitiveness through grant AYA2012-31447 which is partly funded by the FEDER program. AA-H also acknowledges AYA2015-64346-C2-1-P, which is partly funded by theFEDERprogramme. AHC also acknowledges funding by the Spanish Ministry of Economy and Competitiveness under grants AYA2015-70815-ERC and AYA2012-31277. OGM acknowledges to the PAPIIT project IA100516. This work is based on observations made with the Gran Telescopio de CANARIAS (GTC), installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, in the island of La Palma. The GTC/CC programs under which the data were obtained are GTC43-15A and an ESO/GTC large programme (182.B-2005). The Gemini programs under which the data were obtained are GS-2004A-Q-41, GS-2005A-Q-6, GN-2006-Q-11, GN-2006-Q-30, GS-2006-Q-62, GS-2007A-DD-7, GN-2007A-Q-49, GS-2009B-Q-43, GN-2010A-C-7, GS-2010B-Q-71, GS-2011B-Q-20 and GS-2012-Q-43. The VLT/VISIR programs under which the data were obtained are 076.B-0599(A), 077.B-0137(A), 078.B-0303(A), 080.B-0860(A), 084.B-0366(E), 086.B-0349(C) and 086.B-0349(D). This work is also based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, Caltech under NASA contract 1407. TheCASSIS is a product of the Infrared Science Center at Cornell University, supported by NASA and JPL. This publication makes use of data products from the WISE, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. Finally, we are extremely grateful to the GTC stafffor their constant and enthusiastic support, and to the anonymous referee for useful comments.
Publisher Copyright:
© 2017 The Author(s).
PY - 2016/12/21
Y1 - 2016/12/21
N2 - 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/Burst Alert Telescope nine month catalogue. 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 per cent) are extended or possibly extended and 17-25 per cent are pointlike. This extended emission is compact and it has low surface brightness compared with the nuclear emission, and it represents, on average, ~30 per cent 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 (SF) show more extended emission (650 ± 700 pc) than active galactic nuclei (AGN)-dominated systems (300 ± 100 pc). In general, the galaxies with pointlike 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 SF.
AB - 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/Burst Alert Telescope nine month catalogue. 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 per cent) are extended or possibly extended and 17-25 per cent are pointlike. This extended emission is compact and it has low surface brightness compared with the nuclear emission, and it represents, on average, ~30 per cent 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 (SF) show more extended emission (650 ± 700 pc) than active galactic nuclei (AGN)-dominated systems (300 ± 100 pc). In general, the galaxies with pointlike 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 SF.
KW - Galaxies: active
KW - Galaxies: nuclei
KW - Galaxies: photometry
KW - Galaxies: Seyfert
KW - Infrared: galaxies
KW - Techniques: high angular resolution
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U2 - 10.1093/mnras/stw2125
DO - 10.1093/mnras/stw2125
M3 - Article
AN - SCOPUS:85043566523
SN - 0035-8711
VL - 463
SP - 3531
EP - 3555
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -