2021ApJ...916...78C

Query : 2021ApJ...916...78C

2021ApJ...916...78C - Astrophys. J., 916, 78-78 (2021/August-1)

Star formation in a strongly magnetized cloud.

CHENG Y., TAN J.C., CASELLI P., FISSEL L., ARCE H.G., FONTANI F., GOODSON M.D., LIU M. and GALITZKI N.

Abstract (from CDS):

We study star formation in the Center Ridge 1 (CR1) clump in the Vela C giant molecular cloud, selected as a high column density region that shows the lowest level of dust continuum polarization-angle dispersion, likely indicating that the magnetic field is relatively strong. We observe the source with the Atacama Large Millimeter/submillimeter Array 7 m array at 1.05 and 1.3 mm wavelengths, which enable measurements of dust temperature, core mass, and astrochemical deuteration. A relatively modest number of 11 dense cores are identified via their dust continuum emission, with masses spanning from 0.17-6.7 M☉. Overall CR1 has a relatively low compact dense gas fraction compared with other typical clouds with similar column densities, which may be a result of the strong magnetic field and/or the very early evolutionary stage of this region. The deuteration ratios, Dfrac, of the cores, measured with N2H+(3-2) and N2D+(3-2) lines, span from 0.011-0.85, with the latter being one of the highest values yet detected. The level of deuteration appears to decrease with evolution from prestellar to protostellar phase. A linear filament, running approximately parallel with the large scale magnetic field orientation, is seen connecting the two most massive cores, each having CO bipolar outflows aligned orthogonally to the filament. The filament contains the most deuterated core, likely to be prestellar and located midway between the protostars. The observations permit measurement of the full deuteration structure of the filament along its length, which we present. We also discuss the kinematics and dynamics of this structure, as well as of the dense core population.

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

Journal keyword(s): Molecular clouds - Star formation - Magnetic fields

Nomenclature: Fig. 2: [CTC2021] Vela C CR1 N=1. Fig. 3, Table 1: [CTC2021] Vela C CR1cNN (Nos CR1c1-CR1c11).

Simbad objects: 17

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Number of rows : 17
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 VELA MOL RIDGE MoC 08 53 -45.0           ~ 156 0
2 NAME Vela C Cld 08 57 -43.2           ~ 179 0
3 RCW 36 HII 08 59 00.9 -43 44 10     15.20     ~ 147 0
4 [CTC2021] Vela C CR1c2 mm 08 59 20.75 -43 31 16.0           ~ 1 0
5 [CTC2021] Vela C CR1c11 mm 08 59 22.50 -43 31 36.0           ~ 1 0
6 [CTC2021] Vela C CR1c7 mm 08 59 22.77 -43 30 54.0           ~ 1 0
7 [CTC2021] Vela C CR1c5 mm 08 59 23.42 -43 26 40.0           ~ 1 0
8 [CTC2021] Vela C CR1c1 mm 08 59 24.61 -43 32 01.0           ~ 1 0
9 [CTC2021] Vela C CR1c4 mm 08 59 26.17 -43 26 12.0           ~ 1 0
10 [CTC2021] Vela C CR1c10 mm 08 59 26.82 -43 26 06.0           ~ 1 0
11 [CTC2021] Vela C CR1 mm 08 59 27.0 -43 30 00           ~ 1 0
12 [CTC2021] Vela C CR1c8 mm 08 59 31.78 -43 30 52.0           ~ 1 0
13 [CTC2021] Vela C CR1c9 mm 08 59 32.06 -43 33 57.0           ~ 1 0
14 [CTC2021] Vela C CR1c3 mm 08 59 32.15 -43 29 53.0           ~ 1 0
15 [YMS99a] Clump 5 PoC 08 59 32.5 -43 32 53           ~ 2 0
16 [CTC2021] Vela C CR1c6 mm 08 59 35.55 -43 30 24.0           ~ 1 0
17 [DBS2003] 127 cor 10 38 33 -58 19.3           ~ 36 0

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