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Title:
Discovery of a strong Baldwin effect in mid-infrared AGN lines
Authors:
Hönig, S. F.; Smette, A.; Beckert, T.; Horst, H.; Duschl, W.; Gandhi, P.; Kishimoto, M.; Weigelt, G.
Affiliation:
AA(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany ), AB(European Southern Observatory, Casilla 19001, Santiago 19, Chile), AC(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany), AD(Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Leibnizstr. 15, 24098 Kiel, Germany ; Zentrum für Astronomie, ITA, Universität Heidelberg, Albert-Ueberle-Str. 2, 69120 Heidelberg, Germany), AE(Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Leibnizstr. 15, 24098 Kiel, Germany), AF(RIKEN Cosmic Radiation Lab, 2-1 Hirosawa, Wakoshi Saitama 351-0198, Japan), AG(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany), AH(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany)
Publication:
Astronomy and Astrophysics, Volume 485, Issue 2, 2008, pp.L21-L24 (A&A Homepage)
Publication Date:
07/2008
Origin:
EDP Sciences
Keywords:
galaxies: Seyfert, galaxies: active, infrared: galaxies, galaxies quasars: emission lines, X-rays: galaxies
DOI:
10.1051/0004-6361:200810123
Bibliographic Code:
2008A&A...485L..21H

Abstract

We present the discovery of a Baldwin effect in 8 nearby Seyfert galaxies for the three most prominent mid-infrared forbidden emission lines observable from the ground that are commonly found in AGN, [AR III](λ8.99 μm), [S IV](λ10.51 μm), and [Ne II](λ12.81 μm). The observations were carried out using the VLT/VISIR imager and spectrograph at the ESO/Paranal observatory. The bulk of the observed line emission originates in the innermost region within a diameter of 0.4 arcsec, which corresponds to spatial scales of less than 100 pc within the targeted galaxies. The correlation index is approximately -0.6 and does not vary significantly for all lines studied. To date, this is the strongest anticorrelation that has been measured between line equivalent width and continuum luminosity. In the case of Circinus, we show that, despite using mid-infrared lines, obscuration by either the host galaxy or the circumnuclear dust torus might affect the measurement. Given the small observed spatial scales from which most of the line emission emanates, it is unclear how well these observations agree with the favored “disappearing NLR” scenario for the narrow-line Baldwin effect.

Based on ESO observing programmes 078.B-0303, 080.B-0240, and the DDT program 280.B-5068.

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