2014A&A...563L...3C


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.31CET18:13:49

2014A&A...563L...3C - Astronomy and Astrophysics, volume 563, L3-3 (2014/3-1)

First results from the CALYPSO IRAM-PdBI survey. III. Monopolar jets driven by a proto-binary system in NGC1333-IRAS 2A.

CODELLA C., MAURY A.J., GUETH F., MARET S., BELLOCHE A., CABRIT S. and ANDRE Ph.

Abstract (from CDS):

The earliest evolutionary stages of low-mass protostars are characterised by hot and fast jets which remove angular momentum from the circumstellar disk, thus allowing mass accretion onto the central object. However, the launch mechanism is still being debated. We would like to exploit high-angular (∼0.8") resolution and high-sensitivity images to investigate the origin of protostellar jets using typical molecular tracers of shocked regions, such as SiO and SO. We mapped the inner 22'' of the NGC1333-IRAS2A protostar in SiO(5-4), SO(65-54), and the continuum emission at 1.4 mm using the IRAM Plateau de Bure Interferometer in the framework of the CALYPSO IRAM large program. For the first time, we disentangle the NGC1333-IRAS2A Class 0 object into a proto-binary system revealing two protostars (MM1, MM2) separated by ∼560AU, each of them driving their own jet, while past work considered a single protostar with a quadrupolar outflow. We reveal (i) a clumpy, fast (up to |V-VLSR|≥50km/s), and blueshifted jet emerging from the brightest MM1 source; and (ii) a slower redshifted jet, driven by MM2. Silicon monoxide emission is a powerful tracer of high-excitation (Tkin≥100K; nH2≥105cm–3) jets close to the launching region. At the highest velocities, SO appears to mimic SiO tracing the jets, whereas at velocities close to the systemic one, SO is dominated by extended emission, tracing the cavity opened by the jet. Both jets are intrinsically monopolar, and intermittent in time. The dynamical time of the SiO clumps is ≤30-90yr, indicating that one-sided ejections from protostars can take place on these timescales.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: jets and outflows - ISM: molecules - planetary nebulae: individual: NGC1333-IRAS2A

VizieR on-line data: <Available at CDS (J/A+A/563/L3): list.dat fits/*>

Nomenclature: Fig. 1, Table 1: [CMG2014] MMN (Nos MM1-MM3).

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 - 2020
#notes
1 LDN 1448 DNe 03 22.5 +30 35           ~ 469 0
2 SSTc2d J032539.1+304358 Y*? 03 25 39.12 +30 43 58.2           ~ 34 1
3 [CMG2014] MM3 mm 03 28 55.500 +31 14 34.75           ~ 8 0
4 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 403 3
5 [CMG2014] MM1 Y*O 03 28 55.580 +31 14 37.06           ~ 6 0
6 [CMG2014] MM2 Y*O 03 28 55.710 +31 14 35.33           ~ 7 0
7 BD+30 547 Y*O 03 28 57.2107612240 +31 14 19.076624755   10.73 9.98 9.1   G4V 93 1
8 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1231 1
9 HH 211 cor 03 43 56.52 +32 00 52.8           ~ 296 0
10 IRAS 04166+2706 Y*O 04 19 42.62736 +27 13 38.4312           ~ 114 0
11 HH 212 HH 05 43 51.41 -01 02 53.1           ~ 285 1
12 NAME HH 80-81 IRS HII 18 19 11.8 -20 47 35           ~ 134 0

    Equat.    Gal    SGal    Ecl

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2020.10.31-18:13:49

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