2015A&A...577L...2G


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.19CET05:16:32

2015A&A...577L...2G - Astronomy and Astrophysics, volume 577, L2-2 (2015/5-1)

Nascent bipolar outflows associated with the first hydrostatic core candidates Barnard 1b-N and 1b-S.

GERIN M., PETY J., FUENTE A., CERNICHARO J., COMMERCON B. and MARCELINO N.

Abstract (from CDS):

In the theory of star formation, the first hydrostatic core (FHSC) phase is a critical step in which a condensed object emerges from a prestellar core. This step lasts about one thousand years, a very short time compared with the lifetime of prestellar cores, and therefore is hard to detect unambiguously. We present IRAM Plateau de Bure observations of the Barnard 1b dense molecular core, combining detections of H2CO and CH3OH spectral lines and dust continuum at 2.3'' resolution (∼500AU). The two compact cores B1b-N and B1b-S are detected in the dust continuum at 2mm, with fluxes that agree with their spectral energy distribution. Molecular outflows associated with both cores are detected. They are inclined relative to the direction of the magnetic field, in agreement with predictions of collapse in turbulent and magnetized gas with a ratio of mass to magnetic flux somewhat higher than the critical value, µ∼2-7. The outflow associated with B1b-S presents sharp spatial structures, with ejection velocities of up to ∼7km/s from the mean velocity. Its dynamical age is estimated to be ∼2000yr. The B1b-N outflow is smaller and slower, with a short dynamical age of ∼1000yr. The B1b-N outflow mass, mass-loss rate, and mechanical luminosity agree well with theoretical predictions of FHSC. These observations confirm the early evolutionary stage of B1b-N and the slightly more evolved stage of B1b-S.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: jets and outflows - ISM: individual objects: Barnard 1b - stars: formation

VizieR on-line data: <Available at CDS (J/A+A/577/L2): list.dat fits/*>

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3464 3
2 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 247 0
3 2MASS J03331667+3107548 Y*O 03 33 16.68 +31 07 54.9           ~ 98 2
4 SSTc2d J033317.8+310931 cor 03 33 17.85 +31 09 31.9           ~ 70 0
5 [HKM99] B1-bW PoC 03 33 20.0 +31 07 20           ~ 6 0
6 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 150 0
7 [HRF2005] 3 PoC 03 33 21.3 +31 07 27           ~ 54 0
8 [KJD2006] SMM J033335+31075 PoC 03 33 21.3 +31 07 28           ~ 66 0
9 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1010 0
10 4C 32.14 QSO 03 36 30.10760600 +32 18 29.3422210     17.50 16.6   ~ 568 1
11 EM* MWC 349 Em* 20 32 45.6328 +40 39 36.143   15.88 13.15 12.13   Bep 691 1

    Equat.    Gal    SGal    Ecl

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2019.11.19-05:16:32

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