C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST06:40:44

2011MNRAS.412.1755L - Mon. Not. R. Astron. Soc., 412, 1755-1764 (2011/April-2)

Forming protostars in molecular clouds with shocked envelope expansion and core collapse.

LOU Y.-Q. and GAO Y.

Abstract (from CDS):

Spectral observations of molecular line profiles reveal the so-called `blue profiles' for double-peaked molecular spectral lines with stronger blue and weaker red peaks as notable features for star-forming cloud core collapses under the self-gravity. In contrast, ∼25-30 per cent of observed molecular spectral line profiles in star-forming clouds or cores also show the so-called double-peaked `red profiles' with red peaks stronger than blue peaks. Gao & Lou show that these unexplained `red profiles' can be signatures of global self-similar dynamics for envelope expansion with core collapse (EECC) within star-forming molecular clouds or cores. We demonstrate here that spatially resolved `red profiles' of HCO+ (J= 1-0) and CS (J= 2-1) molecular transitions from the low-mass star-forming cloud core FeSt 1-457 together with its radial profile of column density inferred from dust extinction observations appear to reveal a self-similar hydrodynamic shock phase for global EECC. Observed spectral profiles of C18O (J= 1-0) are also fitted by the same EECC model. For further observational tests, the spatially resolved profiles of molecular transitions HCO+ (J= 3-2) and CS (J= 3-2) as well as the radial profiles of (sub)millimetre continuum emissions at three wavelengths of 1.2, 0.85 and 0.45 mm from FeSt 1-457 are also predicted.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): line: profiles - radiative transfer - stars: formation - stars: winds, outflows - ISM: clouds - ISM: individual objects: FeSt 1-457

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 NAME [BM89] L1517B cor 04 55 18.8 +30 38 04           ~ 133 0
2 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 898 1
3 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 351 1
4 DCld 001.6+03.8 DNe 17 35 47.50 -25 32 59.0           ~ 56 0

    Equat.    Gal    SGal    Ecl

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