2011A&A...529A...1S


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.17CEST05:25:01

2011A&A...529A...1S - Astronomy and Astrophysics, volume 529A, 1-1 (2011/5-1)

The link between molecular cloud structure and turbulence.

SCHNEIDER N., BONTEMPS S., SIMON R., OSSENKOPF V., FEDERRATH C., KLESSEN R.S., MOTTE F., ANDRE P., STUTZKI J. and BRUNT C.

Abstract (from CDS):

We aim to better understand how the spatial structure of molecular clouds is governed by turbulence. For that, we study the large-scale spatial distribution of low-density molecular gas and search for characteristic length scales. We employ a 35 square degrees 13CO 1-0 molecular line survey of Cygnus X and visual extinction (AV) maps of 17 Galactic clouds to analyze the spatial structure with the Δ-variance method. This sample contains a large variety of different molecular cloud types with different star-forming activity. The Δ-variance spectra obtained from the AV maps show differences between low-mass star-forming (SF) clouds and massive giant molecular clouds (GMC) in terms of shape of the spectrum and its power-law exponent β. Low-mass SF clouds have a double-peak structure with characteristic size scales around 1pc (though with a large scatter around this value) and 4pc. The GMCs show no characteristic scale in the AV-maps, which can partly be ascribed to a distance effect owing to a larger line-of-sight (LOS) confusion. The Δ-variance for Cygnus, determined from the 13CO survey, shows characteristic scales at 4pc and 40pc, either reflecting the filament structure and large-scale turbulence forcing or - for the 4pc scale - the scale below which the 13CO 1-0 line becomes optically thick. Though there are different processes that can introduce characteristic scales, such as geometry, decaying turbulence, the transition scale from supersonic to subsonic turbulence (the sonic scale), line-of-sight effects and energy injection caused by expanding supernova shells, outflows, HII-regions, and although the relative contribution of these effects strongly varies from cloud to cloud, it is remarkable that the resulting turbulent structure of molecular clouds shows similar characteristics.

Abstract Copyright:

Journal keyword(s): methods: analytical - dust, extinction - ISM: molecules - ISM: structure

Simbad objects: 50

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Number of rows : 50

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 937 3
2 * alf UMi cC* 02 31 49.09456 +89 15 50.7923 3.00 2.62 2.02 1.53 1.22 F8Ib 597 2
3 NGC 1333 SFR 03 28 55 +31 22.2   10.9       ~ 1174 1
4 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 988 0
5 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3258 0
6 LDN 1512 MoC 05 04 09.7 +32 43 09           ~ 158 0
7 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 227 0
8 NAME Ori A MoC 05 38 -07.1           ~ 2594 0
9 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1116 0
10 NAME Mon R2 HII 06 07 46.6 -06 22 59           ~ 630 2
11 NAME ROSETTE MOL CLOUD MoC 06 34.7 +04 02           ~ 219 0
12 NAME Mon I MoC 06 35 +10.1           ~ 197 0
13 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1532 1
14 NAME Maddalena Cloud MoC 06 48.1 -03 52           ~ 78 0
15 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1079 2
16 V* R Leo Mi* 09 47 33.4839808805 +11 25 43.823283729 9.22 8.94 7.53 3.39 0.12 M7-9e 859 1
17 NAME Polaris Flare MoC 11 00 14.8 +86 10 52           ~ 152 1
18 NAME Cha Dark Cloud SFR 11 55 -78.0           ~ 521 1
19 NAME North Polar Spur ISM 12 00 +00.0           ~ 291 1
20 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 235 0
21 NAME Lup Cloud SFR 16 03 -38.1           ~ 474 0
22 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1064 1
23 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 590 2
24 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2898 0
25 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 313 1
26 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 869 2
27 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 383 0
28 * chi Cyg S* 19 50 33.9162220032 +32 54 50.556353217 7.02 6.06 4.24 1.81 -0.01 S6-9/1-2e 656 0
29 Ass Cyg OB 3 As* 20 07 +35.9           ~ 161 0
30 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 237 1
31 NAME Northern Coalsack DNe 20 21 +37.0           ~ 94 0
32 Ass Cyg OB 9 As* 20 21 +39.9           ~ 111 0
33 SNR G078.2+00.1 SNR 20 21 56 +40 15.6           ~ 35 0
34 * gam Cyg V* 20 22 13.7018357 +40 15 24.044963 3.44 2.90 2.23 1.74 1.40 F8Ib 539 0
35 M 29 OpC 20 23 56 +38 31.4   7.30 6.6     ~ 217 0
36 NAME SH 2-106 IR Y*O 20 27 26.502 +37 22 42.03           ~ 153 1
37 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 404 2
38 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 577 1
39 RAFGL 2591 Y*O 20 29 25.2650 +40 11 26.532   18       ~ 560 5
40 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 744 0
41 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 355 1
42 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 927 0
43 DR 23 Rad 20 40.8 +41 54           ~ 35 0
44 IC 5070 HII 20 51.0 +44 22           ~ 170 1
45 NGC 7000 HII 20 58 47 +44 19.8           ~ 352 1
46 V* T Cep Mi* 21 09 31.7832206157 +68 29 27.190142015 9.15 8.82 7.33     M6-9e 361 0
47 NAME IV CYG ASSOC. As* 21 15 +37.9           ~ 41 0
48 IC 5146 SFR 21 53 24 +47 16.0   7.82 7.2     ~ 370 2
49 NAME Great Rift reg ~ ~           ~ 16 0
50 NAME Aql Region reg ~ ~           ~ 275 0

    Equat.    Gal    SGal    Ecl

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2019.07.17-05:25:01

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