2019A&A...629L...4A


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST15:48:41

2019A&A...629L...4A - Astronomy and Astrophysics, volume 629, L4-4 (2019/9-1)

The role of molecular filaments in the origin of the prestellar core mass function and stellar initial mass function.

ANDRE P., ARZOUMANIAN D., KONYVES V., SHIMAJIRI Y. and PALMEIRIM P.

Abstract (from CDS):


Context. The origin of the stellar initial mass function (IMF) is one of the most debated issues in astrophysics.
Aims. Here we explore the possible link between the quasi-universal filamentary structure of star-forming molecular clouds and the origin of the IMF.
Methods. Based on our recent comprehensive study of filament properties from Herschel Gould Belt survey observations, we derive, for the first time, a good estimate of the filament mass function (FMF) and filament line mass function (FLMF) in nearby molecular clouds. We use the observed FLMF to propose a simple toy model for the origin of the prestellar core mass function (CMF), relying on gravitational fragmentation of thermally supercritical but virialized filaments.
Results. We find that the FMF and the FLMF have very similar shapes and are both consistent with a Salpeter-like power-law function (dN/dlog Mline ∝ Mline–1.5±0.1) in the regime of thermally supercritical filaments (Mline>16 M/pc). This is a remarkable result since, in contrast, the mass distribution of molecular clouds and clumps is known to be significantly shallower than the Salpeter power-law IMF, with dN/dlog Mcl ∝ Mcl–0.7.
Conclusions. Since the vast majority of prestellar cores appear to form in thermally transcritical or supercritical filaments, we suggest that the prestellar CMF and by extension the stellar IMF are at least partly inherited from the FLMF through gravitational fragmentation of individual filaments.

Abstract Copyright: © Ph. André et al. 2019

Journal keyword(s): stars: formation - ISM: clouds - ISM: structure - submillimeter: ISM

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Barnard 211 DNe 04 17 35 +27 43.1           ~ 100 0
2 LDN 1495 DNe 04 18.1 +27 37           ~ 303 1
3 Barnard 213 DNe 04 20 51 +27 16.3           ~ 168 0
4 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1217 0
5 NAME Polaris Flare MoC 11 00 14.8 +86 10 52           ~ 168 1
6 NAME Musca Cld 12 23 -71.3           ~ 168 0
7 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3156 1
8 NGC 6334 HII 17 20 51 -36 06.9           ~ 605 0
9 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 351 1
10 IC 5146 OpC 21 53 24 +47 16.0           ~ 400 2
11 NAME Gould Belt PoG ~ ~           ~ 752 1
12 NAME Aql Region reg ~ ~           ~ 328 0

    Equat.    Gal    SGal    Ecl

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2021.04.19-15:48:41

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