2018ApJ...861...14C


Query : 2018ApJ...861...14C

2018ApJ...861...14C - Astrophys. J., 861, 14-14 (2018/July-1)

Infall signatures in a prestellar core embedded in the high-mass 70 µm dark IRDC G331.372-00.116.

CONTRERAS Y., SANHUEZA P., JACKSON J.M., GUZMAN A.E., LONGMORE S., GARAY G., ZHANG Q., NGUYEN-LU'O'NG Q., TATEMATSU K., NAKAMURA F., SAKAI T., OHASHI S., LIU T., SAITO M., GOMEZ L., RATHBORNE J. and WHITAKER S.

Abstract (from CDS):

Using Galactic Plane surveys, we have selected a massive (1200 M), cold (14 K) 3.6-70 µm dark IRDC, G331.372-00.116. This infrared dark cloud (IRDC) has the potential to form high-mass stars, and given the absence of current star formation signatures, it seems to represent the earliest stages of high-mass star formation. We have mapped the whole IRDC with the Atacama Large Millimeter/submillimeter Array (ALMA) at 1.1 and 1.3 mm in dust continuum and line emission. The dust continuum reveals 22 cores distributed across the IRDC. In this work, we analyze the physical properties of the most massive core, ALMA1, which has no molecular outflows detected in the CO (2-1), SiO (5-4), and H2CO (3-2) lines. This core is relatively massive (M = 17.6 M), subvirialized (virial parameter αvir = Mvir/M = 0.14), and is barely affected by turbulence (transonic Mach number of 1.2). Using the HCO+ (3-2) line, we find the first detection of infall signatures in a relatively massive, prestellar core (ALMA1) with the potential to form a high-mass star. We estimate an infall speed of 1.54 km s–1 and a high accretion rate of 1.96 x 10–3 M yr–1. ALMA1 is rapidly collapsing, out of virial equilibrium, which is more consistent with competitive accretion scenarios rather than the turbulent core accretion model. On the other hand, ALMA1 has a mass ∼6 times larger than the clumps Jeans mass, as it is in an intermediate mass regime (MJ = 2.7 < M <= 30 M), contrary to what both the competitive accretion and turbulent core accretion theories predict.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: clouds - ISM: individual objects: IRDC G331.372-00.116 - ISM: kinematics and dynamics - ISM: molecules - stars: formation

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 3C 279 Bla 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2811 2
2 QSO B1424-41 QSO 14 27 56.29756536 -42 06 19.4375991   18.48 17.7 16.30   ~ 402 1
3 PMN J1603-4904 QSO 16 03 50.690 -49 04 05.49   20.67       ~ 63 0
4 SDC G331.372-0.115 DNe 16 11 33.92 -51 34 53.6           ~ 5 0
5 AGAL G331.372-00.116 smm 16 11 34 -51 34.9           ~ 9 0
6 3FGL J1617.4-5846 AGN 16 17 17.8913859288 -58 48 07.860059063   18.23       ~ 107 1
7 GAL 332.80-00.60 HII 16 19 47 -51 04.1           ~ 92 1
8 [WZT2014] P6-SMA 1 smm 18 10 07.80 -19 29 01.2           ~ 7 0
9 [CBH2011b] G11.92-0.61 MM2 mm 18 13 57.860 -18 54 14.04           ~ 12 0
10 [TKB2013] C1-S cor 18 42 46.50 -04 04 16.0           ~ 15 0
11 MSXDC G028.23-0.19 DNe 18 43 31.3 -04 13 18           ~ 24 0
12 QSO B1921-293 BLL 19 24 51.05595514 -29 14 30.1210524   18.71 18.21 15.07   ~ 738 0

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2021.09.26-07:40:15

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