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26 April 2024 |
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Discovery of a strong Baldwin effect in mid-infrared AGN lines | | S. F. Hoenig
; A. Smette
; T. Beckert
; H. Horst
; W. Duschl
; P. Gandhi
; M. Kishimoto
; G. Weigelt
; | | Date: |
14 May 2008 | | 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, [ArIII](8.99 micron), [SIV](10.51
micron), and [NeII](12.81 micron). The observations were carried out using the
VLT/VISIR imager and spectroraph at the ESO/Paranal observatory. The bulk of
the observed line emission comes from the inner <0.4 arcsec which corresponds
to spatial scales <100 pc in our object sample. The correlation index is
approximately -0.6 without significant difference among the lines. This is the
strongest anti-correlation between line equivalent width and continuum
luminosity found so far. In the case of Circinus, we show that despite the use
of mid-infrared lines, obscuration by either the host galaxy or the
circumnuclear dust torus might affect the equivalent widths. Given the small
observed spatial scales from which most of the line emission emanates, it is
unclear how these observations fit into the favored "disappearing NLR’’
scenario for the narrow-line Baldwin effect. | | Source: | arXiv, 0805.2151 | | Services: | Forum | Review | PDF | Favorites | |
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