Infrared spectropolarimetry of Seyfert galaxy NGC1068
Although most of the luminosity of Seyfert galaxy nuclei is emitted in the IR, the relative amounts of thermal dust and non-thermal emission are uncertain. Seyfert galaxies generally have smooth and featureless IR spectra, in contrast to the prominent dust emission features seen in galaxies whose nu...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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1984
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| _version_ | 1826263124086358016 |
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| author | Aitken, D Bailey, J Briggs, G Hough, J Roche, P |
| author_facet | Aitken, D Bailey, J Briggs, G Hough, J Roche, P |
| author_sort | Aitken, D |
| collection | OXFORD |
| description | Although most of the luminosity of Seyfert galaxy nuclei is emitted in the IR, the relative amounts of thermal dust and non-thermal emission are uncertain. Seyfert galaxies generally have smooth and featureless IR spectra, in contrast to the prominent dust emission features seen in galaxies whose nuclei resemble giant H II regions - the star burst nuclei1,2. Nevertheless, in type 2 Seyferts, the general form of the energy distribution and lack of marked variability suggest that here too thermal dust emission is dominant 3-5, and in NGC1068 this supposition is supported by the resolved size of its nucleus6. Dust is observed in absorption at 10 m (refs 7,8) and in emission near 20 m (ref. 9). Polarization has been detected from the UV to 10 m, and attributed to scattering and absorption at short wavelengths10 with a possible non-thermal component11,12, to scattering and non-thermal radiation in the near IR9, and to either absorption or non-thermal emission in the 10 m region13. We present here spectropolarimetric measurements of NGC1068, between 8 and 13 m, which show that the polarized flux at these wavelengths is intrinsic to the emission mechanism and not due to absorption by aligned grains. © 1984 Nature Publishing Group. |
| first_indexed | 2024-03-06T19:46:43Z |
| format | Journal article |
| id | oxford-uuid:228d79e5-85f7-4aff-944b-04a350542488 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:46:43Z |
| publishDate | 1984 |
| record_format | dspace |
| spelling | oxford-uuid:228d79e5-85f7-4aff-944b-04a3505424882022-03-26T11:39:24ZInfrared spectropolarimetry of Seyfert galaxy NGC1068Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:228d79e5-85f7-4aff-944b-04a350542488EnglishSymplectic Elements at Oxford1984Aitken, DBailey, JBriggs, GHough, JRoche, PAlthough most of the luminosity of Seyfert galaxy nuclei is emitted in the IR, the relative amounts of thermal dust and non-thermal emission are uncertain. Seyfert galaxies generally have smooth and featureless IR spectra, in contrast to the prominent dust emission features seen in galaxies whose nuclei resemble giant H II regions - the star burst nuclei1,2. Nevertheless, in type 2 Seyferts, the general form of the energy distribution and lack of marked variability suggest that here too thermal dust emission is dominant 3-5, and in NGC1068 this supposition is supported by the resolved size of its nucleus6. Dust is observed in absorption at 10 m (refs 7,8) and in emission near 20 m (ref. 9). Polarization has been detected from the UV to 10 m, and attributed to scattering and absorption at short wavelengths10 with a possible non-thermal component11,12, to scattering and non-thermal radiation in the near IR9, and to either absorption or non-thermal emission in the 10 m region13. We present here spectropolarimetric measurements of NGC1068, between 8 and 13 m, which show that the polarized flux at these wavelengths is intrinsic to the emission mechanism and not due to absorption by aligned grains. © 1984 Nature Publishing Group. |
| spellingShingle | Aitken, D Bailey, J Briggs, G Hough, J Roche, P Infrared spectropolarimetry of Seyfert galaxy NGC1068 |
| title | Infrared spectropolarimetry of Seyfert galaxy NGC1068 |
| title_full | Infrared spectropolarimetry of Seyfert galaxy NGC1068 |
| title_fullStr | Infrared spectropolarimetry of Seyfert galaxy NGC1068 |
| title_full_unstemmed | Infrared spectropolarimetry of Seyfert galaxy NGC1068 |
| title_short | Infrared spectropolarimetry of Seyfert galaxy NGC1068 |
| title_sort | infrared spectropolarimetry of seyfert galaxy ngc1068 |
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