10 Micron Imaging of Seyfert Galaxies from the 12 Micron Sample

Gorjian, Varoujan; Werner, M. W.; Jarrett, T. H.; Cole, David M.; Ressler, Michael E.

doi:10.1086/381791

Cited by 49 publications

(72 citation statements)

References 43 publications

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“…"Sombrero Galaxy". For this object the measured 11.9 µm flux, <60 mJy, is in agreement with the results found at Maiolino et al (1995) and Gorjian et al (2004).…”

Section: Resultssupporting

confidence: 90%

The core flux of the brightest 10 $\mathsf{\mu}$m galaxies in the southern sky

Raban¹,

Heijligers²,

Röttgering³

et al. 2008

A&A

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Aims. Near diffraction-limited images have been taken at 8.9, 11.9, and 12.9 µm for the brightest extragalactic sources in the southern sky, in order to optimally plan N-band observations with MIDI (MID-infrared Interferometric instrument) at the VLTI. Methods. We have assembled a sample of 21 objects consisting of all the AGNs observable from Paranal observatory, Chile, plus three non-AGN objects, with an estimated N-band flux greater than 400 mJy. We used the TIMMI2 Mid Infrared instrument mounted on the ESO's 3.6 m telescope to obtain near diffraction-limited images in order to establish the unresolved core flux within <0.5 arscsec.Results. Positions and core total fluxes were obtained for all sources in our sample and compared with similar investigations in the literature. We find that 15 AGN and the nuclear starburst in NGC 253 exhibit an unresolved core flux <300 mJy at 11.9 µm, making them promising targets for MIDI at the VLTI. For extended sources, near diffraction-limited images are presented and discussed.

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“…"Sombrero Galaxy". For this object the measured 11.9 µm flux, <60 mJy, is in agreement with the results found at Maiolino et al (1995) and Gorjian et al (2004).…”

Section: Resultssupporting

confidence: 90%

The core flux of the brightest 10 $\mathsf{\mu}$m galaxies in the southern sky

Raban¹,

Heijligers²,

Röttgering³

et al. 2008

A&A

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show abstract

“…The AGN appears as a point-like source with FWHM = 0.9 on the 10.4 µm image. The flux measurements are in agreement with the measurements by Gorjian et al (2004). The 12.9/10.4 flux ratio has a value of 2.44, compatible with both the AGN and PDR templates, and thus PAH bands may be present.…”

Section: Unresolved Galaxiessupporting

confidence: 88%

“…The 10.4 µm flux measured from the TIMMI 2 dataset for the central source is in good agreement with the N-band measurement from Gorjian et al (2004). The morphology seen on the TIMMI 2 map at 11.9 µm is consistent with high resolution NIR images, particularly the 0.4 resolution J and H SHARP maps published by Genzel et al (1995): the circumnuclear ring shows enhanced brightness to the NE and SW.…”

Section: Ngc 7469supporting

confidence: 83%

Mid-infrared imaging of active galaxies

Galliano¹,

Alloin

Pantin

et al. 2005

A&A

163

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Abstract. High resolution, mid-infrared (MIR) images of nine nearby active galaxies are presented. The data were obtained with the TIMMI 2 instrument mounted at the ESO 3.6 m telescope using a set of N-band narrow filters. The resulting images have an angular resolution of 0.6 −1 . The MIR emission has been resolved in four galaxies: NGC 253, NGC 1365, NGC 1808 and NGC 7469. The images show a circumnuclear population of unknown MIR sources in NGC 1365 and NGC 1808, coincident with radio sources. These MIR/radio sources are interpreted in terms of embedded young star clusters. A high-resolution MIR map of NGC 253 is also presented, and enables the identification of a previously unknown MIR counterpart to the radio nucleus. Extended MIR emission is detected in NGC 7469, and concurs with previous observations in the NIR and radio. For this source, an interesting morphological difference between the 10.4 µm and the 11.9 µm emission is observed, suggesting the presence of a dust-rich micro-bar. Our MIR images of Circinus do not show resolved emission from the nucleus down to an angular scale of 0.5 . In the case of NGC 2992, an upper limit to the extended MIR emission can be set. We provide new MIR flux measurements for the unresolved AGN in NGC 5995, IZw1 and IIZw136.

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“…Its unresolved near-infrared emission shows a strong bump at 2.2 μm which is interpreted as very hot dust near its sublimation temperature (T ∼ 1200 K), very likely located both in the upper layers of the torus and close to the apex of the polar scattering region (Rodríguez-Ardila & Mazzalay 2006). While the source appears unresolved with a flux of 0.64 ± 0.10 Jy in the TIMMI2 image at 11.9 μm (Raban et al 2008), Gorjian et al (2004) detected an approximately 1 arcsec long extension from the nucleus to the northwest.…”

Section: Mrk 1239mentioning

confidence: 95%

Parsec-scale dust distributions in Seyfert galaxies

Tristram¹,

Raban

Meisenheimer

et al. 2009

A&A

113

106

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Aims. The emission of warm dust dominates the mid-infrared spectra of active galactic nuclei (AGN). Only interferometric observations provide the necessary angular resolution to resolve the nuclear dust and to study its distribution and properties. The investigation of dust in AGN cores is hence one of the main science goals for the MID-infrared Interferometric instrument MIDI at the VLTI. As the first step, the feasibility of AGN observations was verified and the most promising sources for detailed studies were identified. Methods. This was carried out in a "snapshot survey" with MIDI using Guaranteed Time Observations. In the survey, observations were attempted for 13 of the brightest AGN in the mid-infrared which are visible from Paranal. Results. The results of the three brightest, best studied sources have been published in separate papers. Here we present the interferometric observations for the remaining 10, fainter AGN. For 8 of these, interferometric measurements could be carried out. Size estimates or limits on the spatial extent of the AGN-heated dust were derived from the interferometric data of 7 AGN. These indicate that the dust distributions are compact, with sizes on the order of a few parsec. The derived sizes roughly scale with the square root of the luminosity in the mid-infrared, s ∝ √ L MIR , with no clear distinction between type 1 and type 2 objects. This is in agreement with a model of nearly optically thick dust structures heated to T ∼ 300 K. For three sources, the 10 μm feature due to silicates is tentatively detected either in emission or in absorption. Conclusions. The faint AGN of the snapshot survey are at the sensitivity limit of observations with MIDI. Thus, the data set presented here provides a good insight into the observational difficulties and their implications for the observing strategy and data analysis. Based on the results for all AGN studied with MIDI so far, we conclude that in the mid-infrared the differences between individual galactic nuclei are greater than the generic differences between type 1 and type 2 objects.

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10 Micron Imaging of Seyfert Galaxies from the 12 Micron Sample

Cited by 49 publications

References 43 publications

The core flux of the brightest 10 $\mathsf{\mu}$m galaxies in the southern sky

The core flux of the brightest 10 $\mathsf{\mu}$m galaxies in the southern sky

Mid-infrared imaging of active galaxies

Parsec-scale dust distributions in Seyfert galaxies

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