2016MNRAS.463.4301H


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST13:07:11

2016MNRAS.463.4301H - Mon. Not. R. Astron. Soc., 463, 4301-4310 (2016/December-3)

Non-linear dense Core formation in the dark cloud L1517.

HEIGL S., BURKERT A. and HACAR A.

Abstract (from CDS):

We present a solution for the observed core fragmentation of filaments in the Taurus L1517 dark cloud which previously could not be explained. Core fragmentation is a vital step for the formation of stars. Observations suggest a connection to the filamentary structure of the cloud gas, but it remains unclear which process is responsible. We show that the gravitational instability process of an infinite, isothermal cylinder can account for the exhibited fragmentation under the assumption that the perturbation grows on the dominant wavelength. We use numerical simulations with the code RAMSES, estimate observed column densities and line-of-sight velocities, and compare them to the observations. A critical factor for the observed fragmentation is that cores grow by redistributing mass within the filament and thus the density between the cores decreases over the fragmentation process. This often leads to wrong dominant wavelength estimates, as it is strongly dependent on the initial central density. We argue that non-linear effects also play an important role in the evolution of the fragmentation. Once the density perturbation grows above the critical line mass, non-linearity leads to an enhancement of the central core density in comparison to the analytical prediction. Choosing the correct initial conditions with perturbation strengths of around 20 per cent leads to inclination-corrected line-of-sight velocities and central core densities within the observational measurement error in a realistic evolution time.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: formation - ISM: kinematics and dynamics - ISM: structure - ISM: structure

Simbad objects: 8

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Number of rows : 8

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 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3679 0
2 LDN 1517C PoC 04 54 47.4 +30 34 48           ~ 20 0
3 LDN 1517A PoC 04 55 06.3 +30 33 40           ~ 25 0
4 NAME [BM89] L1517B cor 04 55 18.8 +30 38 04           ~ 133 0
5 LDN 1517 DNe 04 55 45 +30 33.0           ~ 103 0
6 V* AB Aur Ae* 04 55 45.8459978418 +30 33 04.293281305 7.20 7.16 7.05 6.96 6.70 A0Ve 953 2
7 V* SU Aur Or* 04 55 59.3861369488 +30 34 01.499800471   10.33 9.30 9.17   G2IIIne 546 0
8 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 351 1

    Equat.    Gal    SGal    Ecl

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2021.04.14-13:07:11

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