2022A&A...657L..13P


Query : 2022A&A...657L..13P

2022A&A...657L..13P - Astronomy and Astrophysics, volume 657, L13-13 (2022/1-1)

The width of Herschel filaments varies with distance.

PANOPOULOU G.V., CLARK S.E., HACAR A., HEITSCH F., KAINULAINEN J., NTORMOUSI E., SEIFRIED D. and SMITH R.J.

Abstract (from CDS):


Context. Filamentary structures in nearby molecular clouds have been found to exhibit a characteristic width of 0.1 pc, as observed in dust emission. Understanding the origin of this universal width has become a topic of central importance in the study of molecular cloud structure and the early stages of star formation.
Aims. We investigate how the recovered widths of filaments depend on the distance from the observer by using previously published results from the Herschel Gould Belt Survey.
Methods. We obtained updated estimates on the distances to nearby molecular clouds observed with Herschel by using recent results based on 3D dust extinction mapping and Gaia. We examined the widths of filaments from individual clouds separately, as opposed to treating them as a single population. We used these per-cloud filament widths to search for signs of variation amongst the clouds of the previously published study.
Results. We find a significant dependence of the mean per-cloud filament width with distance. The distribution of mean filament widths for nearby clouds is incompatible with that of farther away clouds. The mean per-cloud widths scale with distance approximately as 4-5 times the beam size. We examine the effects of resolution by performing a convergence study of a filament profile in the Herschel image of the Taurus Molecular Cloud. We find that resolution can severely affect the shapes of radial profiles over the observed range of distances.
Conclusions. We conclude that the data are inconsistent with 0.1 pc being the universal characteristic width of filaments.

Abstract Copyright: © ESO 2022

Journal keyword(s): ISM: clouds - ISM: structure - stars: formation - local insterstellar matter

Errata: erratum vol. 663, art. C1 (2022)

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 * alf UMi cC* 02 31 49.09456 +89 15 50.7923 3.00 2.62 2.02 1.53 1.22 F8Ib 654 2
2 Barnard 211 DNe 04 17 35 +27 43.1           ~ 115 0
3 LDN 1495 DNe 04 18.1 +27 37           ~ 338 1
4 Barnard 213 DNe 04 20 51 +27 16.3           ~ 194 0
5 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4094 0
6 M 42 OpC 05 35 17 -05 23.4           ~ 3970 0
7 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1302 0
8 NAME Polaris Flare MoC 11 00 14.8 +86 10 52           ~ 184 1
9 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 760 0
10 NAME Musca Cld 12 23 -71.3           ~ 196 0
11 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3446 1
12 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 378 1
13 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1049 2
14 NAME Aql Rift DNe 18 32 -01.0           ~ 297 1
15 IC 5146 OpC 21 53 29 +47 14.8           ~ 444 2
16 NAME Aql Region reg ~ ~           ~ 367 0

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2023.01.30-21:44:22

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