2014A&A...567A..78L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:06:00

2014A&A...567A..78L - Astronomy and Astrophysics, volume 567A, 78-78 (2014/7-1)

Star-forming regions of the Aquila rift cloud complex. II. Turbulence in molecular cores probed by NH3 emission.

LEVSHAKOV S.A., HENKEL C., REIMERS D. and WANG M.

Abstract (from CDS):

We intend to derive statistical properties of stochastic gas motion inside the dense, low-mass star-forming molecular cores that are traced by NH3(1,1) and (2,2) emission lines. We use the spatial two-point autocorrelation (ACF) and structure functions calculated from maps of the radial velocity fields. The observed ammonia cores are characterized by complex intrinsic motions of stochastic nature. The measured kinetic temperature ranges between 8.8K and 15.1K. From NH3 excitation temperatures of 3.5-7.3K, we determine H2 densities with typical values of nH2~(1-6)x104cm–3. The ammonia abundance, X=[NH3]/[H2], varies from 2x10–8 to 1.5x10–7. We find oscillating ACFs, which eventually decay to zero with increasing lags on scales of 0.04≲l≲0.5pc. The current paradigm supposes that the star-formation process is controlled by the interplay between gravitation and turbulence with the latter preventing molecular cores from a rapid collapse due to their own gravity. Thus, oscillating ACFs may indicate a damping of the developed turbulent flows surrounding the dense but less turbulent core, a transition to dominating gravitational forces and, hence, to gravitational collapse.

Abstract Copyright:

Journal keyword(s): ISM: molecules - ISM: kinematics and dynamics - radio lines: ISM - line: profiles - techniques: spectroscopic - ISM: clouds

Status at CDS:   Examining the need for a new acronym.

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 - 2020
#notes
1 NGC 595 HII 01 33 33.53 +30 41 29.8           ~ 190 0
2 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5135 1
3 NGC 604 HII 01 34 32.1 +30 47 01           ~ 544 0
4 NAME [BM89] B5 DNe 03 47 38.3 +32 52 43           ~ 220 0
5 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3479 0
6 Barnard 220 DNe 04 41 38.8 +26 00 42           ~ 121 0
7 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1359 0
8 DOBASHI 0279 DNe 17 31 22.2 -19 56 46           ~ 2 1
9 TGU H279 P2 DNe 18 26.7 -03 42           ~ 3 0
10 DOBASHI 1184 DNe 18 29 00.9 -02 04 44           ~ 2 1
11 IRAS 18264-0143 Y*O 18 29 05.280 -01 41 56.62           ~ 11 0
12 IRAS 18264-0142 * 18 29 05.452 -01 40 02.97           ~ 1 0
13 TGU H279 P6 DNe 18 29.1 +00 35           ~ 4 0
14 DOBASHI 1205 DNe 18 29 07.4 -01 44 13           ~ 2 1
15 IRAS 18265-0205 IR 18 29 11.9 -02 03 50           ~ 3 0
16 TGU H279 P22 DNe 18 29.3 -01 26           ~ 3 0
17 [MAM2011] SerpS-MM2 Y*O 18 29 39.009 -01 51 06.80           ~ 3 0
18 TGU H279 P12 DNe 18 29.8 +01 17           ~ 4 0
19 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 912 2
20 DOBASHI 1220 DNe 18 29 52.5 -01 35 27           ~ 2 1
21 [LHR2013] Serpens South 3 cor 18 29 57.0 -02 00 10           ~ 4 1
22 DOBASHI 1227 DNe 18 30 17.9 -01 29 45           ~ 2 1
23 DOBASHI 1194 DNe 18 30 28.5 -02 05 57           ~ 2 1
24 TGU H279 P7 DNe 18 30.7 -02 00           ~ 9 0
25 NAME Aql Rift DNe 18 32 -01.0           ~ 234 1
26 GAL 029.96-00.02 Y*O 18 46 03.7 -02 39 21           ~ 331 1
27 [LHR2013] Ka1 cor 19 41 04.0 +10 57 17           ~ 2 0
28 DOBASHI 3553 DNe 22 35 05.3 +75 16 55           ~ 2 1
29 LDN 1251C DNe 22 35 40.0 +75 18 06           ~ 22 1
30 LDN 1251 DNe 22 36.1 +75 16           ~ 97 0
31 NAME Cep Flare MoC 23 34 +72.0           ~ 102 0
32 NAME Aql Region reg ~ ~           ~ 304 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-07:06:00

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