Structure in the nucleus of NGC 1068 at 10 microns

Fienberg, Richard Tresch; Fazio, G. G.; Gezari, D. Y.; Lamb, G.; Shu, P.; Hoffmann, W. F.; McCreight, Craig R.

doi:10.1086/164900

Cited by 19 publications

(12 citation statements)

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“…2). NGC 1068 shows an extension, first identified by Becklin et al (1973), that extends north-northeast, consistent with previous mid-IR images by Tresch-Fienberg et al (1987) and Bock et al (2000). NGC 7469 is famous for its starburst ring, which was first identified as an extension in the mid-IR by Keto et al (1992b) and then imaged by Miles, Houck, & Hayward (1994).…”

Section: Structuresupporting

confidence: 85%

10 Micron Imaging of Seyfert Galaxies from the 12 Micron Sample

Gorjian

Werner

Jarrett

et al. 2004

ApJ

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We present small-aperture (1B5) photometry and new high-resolution images at 10 m (N band) for 87 Seyfert galaxies from the Extended 12 m Sample drawn from the IRAS database. With this data we hope to test the predictions of the unified model for active galactic nuclei and to search for bright, extended circumnuclear 10 m emission. We detected 62 Seyfert galaxies, 18 of which have no previously published small-aperture photometry. All the detected sources, both Seyfert 1's and Seyfert 2's, show a central point source. The 31 Seyfert 1's and 31 Seyfert 2's that we detected have similar luminosity distributions. Except for previously known bright extended 10 m structure around Arp 220, NGC 1068, and NGC 7469, we see definitive evidence for bright extended emission around only one new object: Mrk 1239. Four other Seyfert 1's and six other Seyfert 2's show evidence of faint, low-level extended emission. One Seyfert 1 and two Seyfert 2's show evidence of significantly increased flux over previously published small-aperture values. We also compared the N-band data with the JÀK s color that we derived from the Two Micron All Sky Survey (2MASS). There is a distinct trend of redder central bulge JÀK s colors corresponding to brighter absolute N-band magnitudes. In color-magnitude space there is a definite grouping of Seyfert 1's and Seyfert 2's, with two sets of outliers.

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Section: Structuresupporting

confidence: 85%

10 Micron Imaging of Seyfert Galaxies from the 12 Micron Sample

Gorjian

Werner

Jarrett

et al. 2004

ApJ

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“…Extended configurations are also in better agreement than compact tori (with a radial size of ∼ <10pc) with the high-resolution NIR and MIR observations of NGC 1068, which showed an emission extended over ∼1" scale (e.g., McCarthy et al, 1982;Chelli et al, 1987;Tresch-Fienberg et al, 1987;Braatz et al, 1993;Cameron et al, 1993). If this emission were due to torus radiation reflected by electron scattering and to NLR dust (Pier & Krolik, 1993), there would probably be too large reddening in the NLR (Cameron et al, 1993).…”

Section: Discussionsupporting

confidence: 66%

The Near‐ and Mid‐Infrared Continuum Emission of Seyfert Nuclei: Constraints on the Models of Obscuring Tori

Fadda

Giuricin

Granato

et al. 1998

ApJ

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For an extended sample of Seyfert galaxies we compile from the literature the infrared Ñuxes in the four IRAS bands, the ground-based small-beam (D5AÈ10A) Ñuxes in the standard Q, N, M, L (or L @) bands, and the nuclear (nonstellar) estimated Ñuxes in the JHK bands. We estimate nuclear Ñuxes in the L band by applying a correction for stellar light.From the statistical study of the infrared colors and luminosities, we derive the typical spectral energy distributions (SEDs) of Seyfert 1 and 2 nuclei and the typical di †erences in luminosities between the two types of objects in the mid-and near-infrared spectral ranges. The analyses of colors and luminosities agree with the fact that in general Seyfert 2 nuclei become increasingly fainter with respect to Seyfert 1 nuclei as we go toward shorter infrared wavelengths. This behavior is consistent with growing anisotropy of a dusty torus emission toward shorter wavelengths, but the degree of anisotropy is low (the radiation appears to be substantially isotropic at km). For Seyfert 2 galaxies having Compton-thin obscurj Z 25 ing structures at hard X-ray energies, we Ðnd correlations between the absorbing hydrogen columns and some infrared colors and luminosities.The observational data appear to severely challenge many models of dusty tori, which hardly account for the shapes of the SEDs and the degree of anisotropy observed in Seyfert galaxies. In particular, at variance with some earlier claims, very thick and compact tori are basically inconsistent with these observational constraints. The most successful models, though having problems in accounting for several details, can Ðt the major infrared observational data of both Seyfert 1 and Seyfert 2 nuclei with tori that extend up to several hundred parsecs and have fairly low optical thickness.

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“…In order to explore the possibility of central heating we calculated color temperatures based on the ratio of our 10.8 µm and 18.2 µm images. Temperature and emission optical depth maps from simple radiative transfer analysis provide a good first-order estimate of the sources of grain heating as well as the relative density of warm grains (Tresch-Fienberg et al 1987). Figure 4 shows our temperature and emission optical depth maps.…”

Section: Dusty Narrow Line Regionmentioning

confidence: 99%

Resolved Mid‐Infrared Emission in the Narrow‐Line Region of NGC 4151

Radomski

Piña

Packham

et al. 2003

ApJ

126

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We present subarcsecond resolution mid infrared images of NGC 4151 at 10.8µm and 18.2µm. These images were taken with the University of Florida mid-IR camera/spectrometer OSCIR at the Gemini North 8 m telescope. We resolve emission at both 10.8µm and 18.2µm extending ∼ 3.5 ′′ across at a P.A. of ∼ 60 • . This coincides with the the narrow line region of NGC 4151 as observed in [OIII] by the Hubble Space Telescope. The most likely explanation for this extended mid-IR emission is dust in the narrow line region heated by a central engine. We find no extended emission associated with the proposed torus and place an upper limit on its mid-IR size of 35 pc.

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Structure in the nucleus of NGC 1068 at 10 microns

Cited by 19 publications

References 0 publications

10 Micron Imaging of Seyfert Galaxies from the 12 Micron Sample

10 Micron Imaging of Seyfert Galaxies from the 12 Micron Sample

The Near‐ and Mid‐Infrared Continuum Emission of Seyfert Nuclei: Constraints on the Models of Obscuring Tori

Resolved Mid‐Infrared Emission in the Narrow‐Line Region of NGC 4151

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