id:"swepub:oai:research.chalmers.se:ab237aaf-bcc2-4150-b440-b2569b9543db"
Sökning: id:"swepub:oai:research.chalmers.se:ab237aaf-bcc2-4150-b440-b2569b9543db" > A closer look at th...
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- Panopoulou, Georgia,1989Panepistimio Kritis,University of Crete (författare)
A closer look at the `characteristic' width of molecular cloud filaments
- Artikel/kapitelEngelska2017
Förlag, utgivningsår, omfång ...
- 2016-11-23
- Oxford University Press (OUP),2017
Nummerbeteckningar
- LIBRIS-ID:oai:research.chalmers.se:ab237aaf-bcc2-4150-b440-b2569b9543db
- https://doi.org/10.1093/mnras/stw3060DOI
- https://research.chalmers.se/publication/537347URI
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- Språk:engelska
- Sammanfattning på:engelska
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- Filaments in Herschel molecular cloud images are found to exhibit a 'characteristic width'. This finding is in tension with spatial power spectra of the data, which show no indication of this characteristic scale. We demonstrate that this discrepancy is a result of the methodology adopted for measuring filament widths. First, we perform the previously used analysis technique on artificial scale-free data, and obtain a peaked width distribution of filament-like structures. Next, we repeat the analysis on three Herschel maps and reproduce the narrow distribution of widths found in previous studies - when considering the average width of each filament. However, the distribution of widths measured at all points along a filament spine is broader than the distribution of mean filament widths, indicating that the narrow spread (interpreted as a 'characteristic' width) results from averaging. Furthermore, the width is found to vary significantly from one end of a filament to the other. Therefore, the previously identified peak at 0.1 pc cannot be understood as representing the typical width of filaments. We find an alternative explanation by modelling the observed width distribution as a truncated power-law distribution, sampled with uncertainties. The position of the peak is connected to the lower truncation scale and is likely set by the choice of parameters used in measuring filament widths. We conclude that a 'characteristic' width of filaments is not supported by the available data.
Ämnesord och genrebeteckningar
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- stars: formation
- ISM: individual objects: Polaris Flare
- Astrophysics - Astrophysics of Galaxies
- ISM: individual objects: IC 5146
- Astrophysics - Solar and Stellar Astrophysics
- ISM: individual objects: Aquila Rift
- methods: statistical
- ISM: clouds
Biuppslag (personer, institutioner, konferenser, titlar ...)
- al., et (författare)
- Panepistimio Kritis (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Monthly Notices of the Royal Astronomical Society: Oxford University Press (OUP)466:3, s. 2529-25410035-87111365-2966
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- Monthly Notices of the Royal Astronomical Society (Sök värdpublikationen i LIBRIS)
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