2020ApJ...890...76N


Query : 2020ApJ...890...76N

2020ApJ...890...76N - Astrophys. J., 890, 76-76 (2020/February-2)

ALMA observations of two massive and dense MALT90 clumps.

NEUPANE S., GARAY G., CONTRERAS Y., GUZMAN A.E. and RODRIGUEZ L.F.

Abstract (from CDS):

We report Atacama Large Millimeter Array observations of 3 mm dust continuum emission and line emission, in HCO+, H13CO+, N2H+, and CH3CN, toward two massive and dense clumps (MDCs) in early but distinct evolutionary phases (prestellar and protostellar), made with the goal of investigating their fragmentation characteristics at angular scales of ∼1''. Toward the prestellar clump we detected 10 compact structures (cores), with radii from 1200-4500 au and masses from 1.6-20 M. Half of these cores exhibit inverse P Cygni profiles in HCO+ and are subvirialized indicating that they are undergoing collapse. Toward the protostellar clump we detected a massive (119 M) central core, with a strong mass infall rate, and nine less massive cores, with masses from 1.7-27 M and radii from 1000-4300 au. CH3CN rotational temperatures were derived for eight cores in the protostellar clump and three cores in the prestellar clump. Cores within the prestellar clump have smaller line widths and lower temperatures than cores within the protostellar clump. The fraction of total mass in cores to clump mass is smaller in the prestellar clump (∼6%) than in the protostellar clump (∼23%). We conclude that we are witnessing the evolution of the dense gas in globally collapsing MDCs; the prestellar clump illustrating the initial stage of fragmentation, harboring cores that are individually collapsing, and the protostellar clump reflecting a later stage in which a considerable fraction of the gas has been gravitationally focused into the central region.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Interstellar medium - Star formation - Massive stars - Collapsing clouds

Nomenclature: Fig. 3, Table 4: [NGC2020] AGAL329 mm-NN (Nos 1-10), [NGC2020] AGAL333 mm-NN (Nos 1-11).

Simbad objects: 32

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Number of rows : 32
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 [VV2006] J131250.9-042451 QSO 13 12 50.9012357 -04 24 49.892418     18.7 19.29   ~ 53 0
2 QSO B1424-41 QSO 14 27 56.29756536 -42 06 19.4375991   18.48 17.7 16.30   ~ 402 1
3 [NGC2020] AGAL329 mm-10 cor 16 01 44.620 -53 11 27.17           ~ 1 0
4 [NGC2020] AGAL329 mm-9 cor 16 01 44.720 -53 11 24.77           ~ 1 0
5 [NGC2020] AGAL329 mm-8 cor 16 01 44.880 -53 11 15.17           ~ 1 0
6 SSTGLMC G329.1845-00.3045 of? 16 01 44.908 -53 11 14.85           ~ 3 0
7 [NGC2020] AGAL329 mm-7 cor 16 01 46.220 -53 11 37.67           ~ 1 0
8 [NGC2020] AGAL329 mm-6 cor 16 01 46.950 -53 11 43.67           ~ 1 0
9 IRAS 15579-5303 of? 16 01 47.01 -53 11 43.3           ~ 33 0
10 [NGC2020] AGAL329 mm-5 cor 16 01 47.950 -53 12 04.07           ~ 1 0
11 [NGC2020] AGAL329 mm-3 cor 16 01 47.990 -53 11 54.17           ~ 1 0
12 [NGC2020] AGAL329 mm-4 cor 16 01 47.990 -53 11 46.07           ~ 1 0
13 [NGC2020] AGAL329 mm-2 cor 16 01 48.590 -53 12 02.87           ~ 1 0
14 [NGC2020] AGAL329 mm-1 cor 16 01 48.620 -53 11 45.47           ~ 1 0
15 PMN J1603-4904 QSO 16 03 50.690 -49 04 05.49   20.67       ~ 63 0
16 3FGL J1617.4-5846 AGN 16 17 17.8913859288 -58 48 07.860059063   18.23       ~ 107 1
17 [NGC2020] AGAL333 mm-10 cor 16 20 51.520 -50 43 45.18           ~ 1 0
18 [NGC2020] AGAL333 mm-11 cor 16 20 51.710 -50 43 46.62           ~ 1 0
19 [NGC2020] AGAL333 mm-9 cor 16 20 52.020 -50 44 20.28           ~ 1 0
20 [NGC2020] AGAL333 mm-8 cor 16 20 52.280 -50 44 18.78           ~ 1 0
21 [NGC2020] AGAL333 mm-7 cor 16 20 53.480 -50 44 09.19           ~ 1 0
22 [NGC2020] AGAL333 mm-6 cor 16 20 53.830 -50 44 17.29           ~ 1 0
23 AGAL G333.014-00.521 Y*O 16 20 54 -50 44.1           ~ 9 0
24 [NGC2020] AGAL333 mm-5 cor 16 20 54.430 -50 44 03.49           ~ 1 0
25 [NGC2020] AGAL333 mm-4 cor 16 20 54.990 -50 44 07.39           ~ 1 0
26 [NGC2020] AGAL333 mm-3 cor 16 20 55.310 -50 44 01.69           ~ 1 0
27 [NGC2020] AGAL333 mm-2 cor 16 20 56.010 -50 43 59.88           ~ 1 0
28 [NGC2020] AGAL333 mm-1 cor 16 20 56.830 -50 44 01.98           ~ 1 0
29 ICRF J165016.6-504448 QSO 16 50 16.6286235628 -50 44 48.188602152   20.95       ~ 50 2
30 AGAL G030.818-00.056 cor 18 47 47.0 -01 54 28           ~ 126 0
31 QSO B1921-293 BLL 19 24 51.05595514 -29 14 30.1210524   18.71 18.21 15.07   ~ 737 0
32 QSO B2128-123 BLL 21 31 35.26175 -12 07 04.7961   16.33 16.11 15.87   ~ 430 1

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2021.09.18-00:50:54

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