Millimetric observations of diffuse galactic emission: Further ideas on the interstellar dust
In this paper we have analyzed some millimetric observations of the Galactic plane previously published by our group in addition with new unpublished 3 mm data. Both sets of data were carried out at the Italian base in Antarctica. The observed emission fluxes can be matched by either T = 7 K and a λ...
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ftumanchesterpub:oai:pure.atira.dk:publications/f9823150-c3e5-4a21-9d87-5cb30e646c2c 2023-11-12T04:08:28+01:00 Millimetric observations of diffuse galactic emission: Further ideas on the interstellar dust Merluzzi, P. Bussoletti, E. Dall'Oglio, G. Piccirillo, L. 1994-11-20 https://research.manchester.ac.uk/en/publications/f9823150-c3e5-4a21-9d87-5cb30e646c2c http://www.journals.uchicago.edu/ApJ eng eng info:eu-repo/semantics/restrictedAccess Merluzzi , P , Bussoletti , E , Dall'Oglio , G & Piccirillo , L 1994 , ' Millimetric observations of diffuse galactic emission: Further ideas on the interstellar dust ' , Astrophysical Journal , vol. 436 , no. 1 , pp. 286-291 . < http://www.journals.uchicago.edu/ApJ > Diffuse radiation Dust extinction article 1994 ftumanchesterpub 2023-10-30T09:16:57Z In this paper we have analyzed some millimetric observations of the Galactic plane previously published by our group in addition with new unpublished 3 mm data. Both sets of data were carried out at the Italian base in Antarctica. The observed emission fluxes can be matched by either T = 7 K and a λ-2 emissivity or T = 15 K and a λ-1.1 emissivity. These results imply that either silicates or amorphous/disordered carbon grains are responsible for the detected fluxes. Laboratory measured optical constants of these kinds of materials have been used in the computations. T = 15 K, λ-1.1 emissivity might be produced by particles in the diffuse medium; T = 7 K characterizes grains in giant molecular clouds. The experimental data do not allow us to discriminate between these two cases. However, a search in both the Dame et al. (1987) CO sky survey and the Désert, Bazell, & Boulanger (1988) list of molecular clouds does not show any coincidence between the individual sources in these catalogs and the Galactic structures we have detected in our experiment. The negative result as well as a check on the atomic abundances which are needed to reproduce the observed fluxes tend to support the idea that our mm data are actually due to thermal emission by dust sitting in a diffuse medium. Furthermore, if we consider the model by Désert, Boulanger, & Puget (1990) for the composition of the interstellar dust, our results do not contradict that large particles (∼0.1 μm) dominated by silicates with an additional dark refractory mantle account for the FIR emission, but another dust component should be introduced in order to model the emission beyond about 440 μm. Article in Journal/Newspaper Antarc* Antarctica The University of Manchester: Research Explorer |
institution |
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The University of Manchester: Research Explorer |
op_collection_id |
ftumanchesterpub |
language |
English |
topic |
Diffuse radiation Dust extinction |
spellingShingle |
Diffuse radiation Dust extinction Merluzzi, P. Bussoletti, E. Dall'Oglio, G. Piccirillo, L. Millimetric observations of diffuse galactic emission: Further ideas on the interstellar dust |
topic_facet |
Diffuse radiation Dust extinction |
description |
In this paper we have analyzed some millimetric observations of the Galactic plane previously published by our group in addition with new unpublished 3 mm data. Both sets of data were carried out at the Italian base in Antarctica. The observed emission fluxes can be matched by either T = 7 K and a λ-2 emissivity or T = 15 K and a λ-1.1 emissivity. These results imply that either silicates or amorphous/disordered carbon grains are responsible for the detected fluxes. Laboratory measured optical constants of these kinds of materials have been used in the computations. T = 15 K, λ-1.1 emissivity might be produced by particles in the diffuse medium; T = 7 K characterizes grains in giant molecular clouds. The experimental data do not allow us to discriminate between these two cases. However, a search in both the Dame et al. (1987) CO sky survey and the Désert, Bazell, & Boulanger (1988) list of molecular clouds does not show any coincidence between the individual sources in these catalogs and the Galactic structures we have detected in our experiment. The negative result as well as a check on the atomic abundances which are needed to reproduce the observed fluxes tend to support the idea that our mm data are actually due to thermal emission by dust sitting in a diffuse medium. Furthermore, if we consider the model by Désert, Boulanger, & Puget (1990) for the composition of the interstellar dust, our results do not contradict that large particles (∼0.1 μm) dominated by silicates with an additional dark refractory mantle account for the FIR emission, but another dust component should be introduced in order to model the emission beyond about 440 μm. |
format |
Article in Journal/Newspaper |
author |
Merluzzi, P. Bussoletti, E. Dall'Oglio, G. Piccirillo, L. |
author_facet |
Merluzzi, P. Bussoletti, E. Dall'Oglio, G. Piccirillo, L. |
author_sort |
Merluzzi, P. |
title |
Millimetric observations of diffuse galactic emission: Further ideas on the interstellar dust |
title_short |
Millimetric observations of diffuse galactic emission: Further ideas on the interstellar dust |
title_full |
Millimetric observations of diffuse galactic emission: Further ideas on the interstellar dust |
title_fullStr |
Millimetric observations of diffuse galactic emission: Further ideas on the interstellar dust |
title_full_unstemmed |
Millimetric observations of diffuse galactic emission: Further ideas on the interstellar dust |
title_sort |
millimetric observations of diffuse galactic emission: further ideas on the interstellar dust |
publishDate |
1994 |
url |
https://research.manchester.ac.uk/en/publications/f9823150-c3e5-4a21-9d87-5cb30e646c2c http://www.journals.uchicago.edu/ApJ |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Merluzzi , P , Bussoletti , E , Dall'Oglio , G & Piccirillo , L 1994 , ' Millimetric observations of diffuse galactic emission: Further ideas on the interstellar dust ' , Astrophysical Journal , vol. 436 , no. 1 , pp. 286-291 . < http://www.journals.uchicago.edu/ApJ > |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1782328754855477248 |