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From flux to dust mass: Does the grain-temperature distribution matter for estimates of cold dust masses in supernova remnants?

Mattsson, L., Gomez, Haley Louise, Andersen, A. C. and Matsuura, Mikako 2015. From flux to dust mass: Does the grain-temperature distribution matter for estimates of cold dust masses in supernova remnants? Monthly Notices of the Royal Astronomical Society 449 (4) , pp. 4079-4090. 10.1093/mnras/stv487

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Abstract

The amount of dust estimated from infrared to sub-millimetre (submm) observations strongly depends on assumptions of different grain sizes, compositions and optical properties. Here we use a simple model of thermal emission from cold silicate/carbon dust at a range of dust grain temperatures and fit the spectral energy distribution (SED) of the Crab nebula as a test. This can lower the derived dust mass for the Crab by ∼50 per cent and 30–40 per cent for astronomical silicates and amorphous carbon grains compared to recently published values (0.25 M⊙ → 0.12 M⊙ and 0.12 M⊙ → 0.072 M⊙, respectively), but the implied dust mass can also increase by as much as almost a factor of 6 (0.25 M⊙ → 1.14 M⊙ and 0.12 M⊙ → 0.71 M⊙) depending on assumptions regarding the sizes/temperatures of the coldest grains. The latter values are clearly unrealistic due to the expected metal budget, though. Furthermore, we show by a simple numerical experiment that if a cold-dust component does have a grain-temperature distribution, it is almost unavoidable that a two-temperature fit will yield an incorrect dust mass estimate. But we conclude that grain temperatures is not a greater uncertainty than the often poorly constrained emissivities (i.e. material properties) of cosmic dust, although there is clearly a need for improved dust emission models. The greatest complication associated with deriving dust masses still arises in the uncertainty in the dust composition.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: Stars: AGB and post-AGB supernovae: general supernovae: individual: Crab nebula dust, extinction
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 7 November 2016
Date of Acceptance: 4 March 2015
Last Modified: 16 Sep 2019 10:17
URI: http://orca-mwe.cf.ac.uk/id/eprint/74323

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