2020ApJ...898..122X


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST11:47:38

2020ApJ...898..122X - Astrophys. J., 898, 122-122 (2020/August-1)

Rotation of two micron all sky survey clumps in molecular clouds.

XU X., LI D., DAI Y.S., GOLDSMITH P.F. and FULLER G.A.

Abstract (from CDS):

We have analyzed the rotational properties of 12 clumps using 13CO (1-0) and C18O (1-0) maps of the Five College Radio Astronomy Observatory 13.7 m radio telescope. The clumps, located within molecular clouds, have radii (R) in the range of 0.06-0.27 pc. The direction of clump elongation is not correlated with the direction of the velocity gradient. We measured the specific angular momentum (J/M) to be between 0.0022-0.025 pc km s–1 based on 13CO images, and between 0.0025-0.021 pc km s–1 based on C18O images. The consistency of J/M based on different tracers indicates the 13CO and C18O in dense clumps trace essentially the same material despite significantly different opacities. We also found that J/M increases monotonically as a function of R in power-law form, J/M∝R^1.58±0.11^. The ratio between rotation energy and gravitational energy, β, ranges from 0.0012 to 0.018. The small values of β imply that rotation alone is not sufficient to support the clump against gravitational collapse.

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

Journal keyword(s): Interstellar medium - Interstellar dynamics - Interstellar molecules - Intercloud medium - Interstellar emissions

Simbad objects: 16

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Number of rows : 16

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 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5281 1
2 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1131 0
3 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3680 0
4 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 725 0
5 LDN 1523 DNe 05 06 13.8 +31 42 20           ~ 44 1
6 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 234 1
7 OMC 2 MoC 05 35 27 -05 10.1           ~ 404 1
8 NAME Ori A MoC 05 38 -07.1           ~ 2757 0
9 LDN 1570 DNe 06 07 28.4 +19 28 04           ~ 39 0
10 LDN 1574 DNe 06 07.7 +18 30           ~ 12 0
11 LDN 1578 DNe 06 08 55 +17 50.4           ~ 11 0
12 [DB2002b] G192.28-0.95 MoC 06 08 55 +17 50.4           ~ 17 0
13 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3922 4
14 LDN 1106 DNe 21 42 15.4 +56 43 44           ~ 22 0
15 LDN 1253 DNe 23 56 32 +58 31.7           ~ 53 0
16 LDN 1257 DNe 23 57 32 +59 39.7           ~ 22 0

    Equat.    Gal    SGal    Ecl

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2021.04.18-11:47:38

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