The Mid-Infrared Narrow Line Baldwin Effect Revealed by Spitzer

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dc.creatorKeremedjiev, M.
dc.creatorHao, L.
dc.creatorCharmandaris, V.
dc.date2008-06-18
dc.date2008-08-25
dc.date.accessioned2026-07-07T12:14:45Z
dc.date.available2026-07-07T12:14:45Z
dc.descriptionWe present our discovery of a narrow-line Baldwin effect, an anti-correlation between the equivalent width (EW) of a line and the flux of the associated continuum, in 5-20$μ$m mid-infared lines from a sample of 68 Active Galactic Nuclei (AGN), located at z$<$0.5, observed with the Infrared Spectrograph on the {\it Spitzer Space Telescope}. Our analysis reveals a clear anti-correlation between the EW of the [SIV] 10.51$μ$m, [NeII] 12.81$μ$m, and [NeIII] 15.56$μ$m lines and their mid-IR continuum luminosities, while the Baldwin effect for [NeV] 14.32$μ$m is not as obvious. We suggest that this anti-correlation is driven by the central AGN and not circumnuclear star formation in the host galaxy. We also find that the slope of the narrow-line Baldwin effect in the mid-infrared does not appear to steepen with increasing ionization potential. Examining the dependence of the EW to the Eddington Ratio ($L/L_{Edd}$) we find no strong relationship for mid-IR lines. Our study indicates that the narrow-line mid-infrared Baldwin Effect is quite different from the broad-line optical/UV Baldwin effect and it is possible that the two effects are unrelated. The discovered anti-correlations open new possibilities in the understanding the physics of the ionizing region and the continuum reprocessing by dust.
dc.description18 pages, 4 figures. Accepted for publication by ApJ
dc.identifierhttps://arxiv.org/abs/0806.2910
dc.identifierhttp://arxiv.org/abs/0806.2910
dc.identifierAstrophys.J.690:1105-1111,2009
dc.identifierdoi:10.1088/0004-637X/690/2/1105
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211302
dc.subjectAstrophysics
dc.titleThe Mid-Infrared Narrow Line Baldwin Effect Revealed by Spitzer
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