2021ApJ...912L...7L

Query : 2021ApJ...912L...7L

2021ApJ...912L...7L - Astrophys. J., 912, L7-L7 (2021/May-1)

A low-mass cold and quiescent core population in a massive star protocluster.

LI S., LU X., ZHANG Q., LEE C.W., SANHUEZA P., BEUTHER H., JIMENEZ-SERRA I., QIU K., PALAU A., FENG S., PILLAI T., KIM K.-T., LIU H.-L., GIRART J.M., LIU T., WANG J., WANG K., LIU H.B., SMITH H.A., LI D., LEE J.-E., LI F., LI J., KIM S., YUE N. and STROM S.

Abstract (from CDS):

Pre-stellar cores represent the initial conditions of star formation. Although these initial conditions in nearby low-mass star-forming regions have been investigated in detail, such initial conditions remain vastly unexplored for massive star-forming regions. We report the detection of a cluster of low-mass starless and pre-stellar core candidates in a massive star protocluster-forming cloud, NGC 6334S. With the Atacama Large Millimeter/submillimeter Array (ALMA) observations at a ∼0.02 pc spatial resolution, we identified 17 low-mass starless core candidates that do not show any evidence of protostellar activity. These candidates present small velocity dispersions, high fractional abundances of NH2D, high NH3 deuterium fractionations, and are completely dark in the infrared wavelengths from 3.6 up to 70 µm. Turbulence is significantly dissipated and the gas kinematics are dominated by thermal motions toward these candidates. Nine out of the 17 cores are gravitationally bound, and therefore are identified as pre-stellar core candidates. The embedded cores of NGC 6334S show a wide diversity in masses and evolutionary stages.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Infrared dark clouds - Early-type stars - Star-forming regions - Star formation - Interstellar medium - Interstellar line emission - Protoclusters

Nomenclature: Fig. 1, Table 1: [LLZ2021] MNN (Nos M1-M17).

Errata: erratum vol. 914, art. 24L (2021)

Simbad objects: 27

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Number of rows : 27
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1365 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4418 0
3 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 863 0
4 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 806 0
5 JCMTSF J162758.6-243343 cor 16 27 58.3 -24 33 42           ~ 28 0
6 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3631 1
7 [LLZ2021] M11 cor 17 18 58.660 -36 07 04.76           ~ 2 0
8 [LLZ2021] M2 cor 17 19 04.280 -36 06 57.17           ~ 3 0
9 [LLZ2021] M14 cor 17 19 04.550 -36 05 31.47           ~ 2 0
10 [LLZ2021] M10 cor 17 19 05.120 -36 06 45.00           ~ 2 0
11 [LLZ2021] M3 cor 17 19 05.610 -36 11 01.29           ~ 2 0
12 [LLZ2021] M12 cor 17 19 06.860 -36 06 22.65           ~ 2 0
13 [LLZ2021] M16 cor 17 19 07.210 -36 08 16.60           ~ 1 0
14 [LLZ2021] M5 cor 17 19 07.390 -36 10 24.52           ~ 1 0
15 [LLZ2021] M13 cor 17 19 07.390 -36 05 55.13           ~ 2 0
16 [LLZ2021] M17 cor 17 19 07.780 -36 10 07.54           ~ 2 0
17 [LZL2020] 2 cor 17 19 08.850 -36 07 03.59           ~ 2 0
18 [LLZ2021] M15 cor 17 19 08.880 -36 08 01.55           ~ 2 0
19 [LLZ2021] M1 cor 17 19 09.380 -36 03 37.96           ~ 2 0
20 [LLZ2021] M7 cor 17 19 09.910 -36 09 05.62           ~ 2 0
21 [LLZ2021] M8 cor 17 19 10.300 -36 09 09.49           ~ 2 0
22 [LLZ2021] M4 cor 17 19 11.120 -36 05 41.37           ~ 2 0
23 [LLZ2021] M9 cor 17 19 11.400 -36 08 44.12           ~ 2 0
24 [LLZ2021] M6 cor 17 19 12.040 -36 06 55.76           ~ 3 0
25 NGC 6334S MoC 17 19.3 -36 36           ~ 12 0
26 NGC 6334 HII 17 20 53 -36 07.9           ~ 682 0
27 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1100 2

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