Spectropolarimetric constraints on the nature of the 3.4 micron absorber in the interstellar medium
Spectropolarimetry of the 3.4 μm aliphatic C-H stretch feature, generally attributed to carbonaceous dust in the diffuse interstellar medium, has been carried out in the line of sight from the Galactic center source Sagittarius A IRS 7. The feature is unpolarized (Δp/Δτ < 0.2): the upper limi...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Institute of Physics Publishing
1999
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| _version_ | 1797096756074250240 |
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| author | Adamson, A Whittet, D Chrysostomou, A Hough, J Aitken, D Wright, G Roche, P |
| author_facet | Adamson, A Whittet, D Chrysostomou, A Hough, J Aitken, D Wright, G Roche, P |
| author_sort | Adamson, A |
| collection | OXFORD |
| description | Spectropolarimetry of the 3.4 μm aliphatic C-H stretch feature, generally attributed to carbonaceous dust in the diffuse interstellar medium, has been carried out in the line of sight from the Galactic center source Sagittarius A IRS 7. The feature is unpolarized (Δp/Δτ < 0.2): the upper limit for polarization is well below that expected on the basis of a model in which the carrier molecules are associated with the aligned silicate component of interstellar dust, for example, as an organic or carbonaceous mantle on a silicate core. The simplest explanation is that the 3.4 μm carrier resides in a population of small, non-polarizing carbonaceous grains, physically separate from the silicates and sharing many characteristics with the carriers of the 217.5 nm extinction bump. |
| first_indexed | 2024-03-07T04:46:05Z |
| format | Journal article |
| id | oxford-uuid:d35319de-6ddb-4310-b65a-eb4c4de27e76 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:46:05Z |
| publishDate | 1999 |
| publisher | Institute of Physics Publishing |
| record_format | dspace |
| spelling | oxford-uuid:d35319de-6ddb-4310-b65a-eb4c4de27e762022-03-27T08:10:24ZSpectropolarimetric constraints on the nature of the 3.4 micron absorber in the interstellar mediumJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:d35319de-6ddb-4310-b65a-eb4c4de27e76EnglishSymplectic Elements at OxfordInstitute of Physics Publishing1999Adamson, AWhittet, DChrysostomou, AHough, JAitken, DWright, GRoche, PSpectropolarimetry of the 3.4 μm aliphatic C-H stretch feature, generally attributed to carbonaceous dust in the diffuse interstellar medium, has been carried out in the line of sight from the Galactic center source Sagittarius A IRS 7. The feature is unpolarized (Δp/Δτ < 0.2): the upper limit for polarization is well below that expected on the basis of a model in which the carrier molecules are associated with the aligned silicate component of interstellar dust, for example, as an organic or carbonaceous mantle on a silicate core. The simplest explanation is that the 3.4 μm carrier resides in a population of small, non-polarizing carbonaceous grains, physically separate from the silicates and sharing many characteristics with the carriers of the 217.5 nm extinction bump. |
| spellingShingle | Adamson, A Whittet, D Chrysostomou, A Hough, J Aitken, D Wright, G Roche, P Spectropolarimetric constraints on the nature of the 3.4 micron absorber in the interstellar medium |
| title | Spectropolarimetric constraints on the nature of the 3.4 micron absorber in the interstellar medium |
| title_full | Spectropolarimetric constraints on the nature of the 3.4 micron absorber in the interstellar medium |
| title_fullStr | Spectropolarimetric constraints on the nature of the 3.4 micron absorber in the interstellar medium |
| title_full_unstemmed | Spectropolarimetric constraints on the nature of the 3.4 micron absorber in the interstellar medium |
| title_short | Spectropolarimetric constraints on the nature of the 3.4 micron absorber in the interstellar medium |
| title_sort | spectropolarimetric constraints on the nature of the 3 4 micron absorber in the interstellar medium |
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