2013A&A...560A..24C


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.21CET23:48:11

2013A&A...560A..24C - Astronomy and Astrophysics, volume 560A, 24-24 (2013/12-1)

Large scale IRAM 30m CO-observations in the giant molecular cloud complex W43.

CARLHOFF P., NGUYEN LUONG Q., SCHILKE P., MOTTE F., SCHNEIDER N., BEUTHER H., BONTEMPS S., HEITSCH F., HILL T., KRAMER C., OSSENKOPF V., SCHULLER F., SIMON R. and WYROWSKI F.

Abstract (from CDS):

We aim to fully describe the distribution and location of dense molecular clouds in the giant molecular cloud complex W43. It was previously identified as one of the most massive star-forming regions in our Galaxy. To trace the moderately dense molecular clouds in the W43 region, we initiated W43-HERO, a large program using the IRAM30 m telescope, which covers a wide dynamic range of scales from 0.3 to 140 pc. We obtained on-the-fly-maps in 13CO (2-1) and C18O (2-1) with a high spectral resolution of 0.1 km/s and a spatial resolution of 12". These maps cover an area of ∼1.5 square degrees and include the two main clouds of W43 and the lower density gas surrounding them. A comparison to Galactic models and previous distance calculations confirms the location of W43 near the tangential point of the Scutum arm at approximately 6 kpc from the Sun. The resulting intensity cubes of the observed region are separated into subcubes, which are centered on single clouds and then analyzed in detail. The optical depth, excitation temperature, and H2 column density maps are derived out of the 13CO and C18O data. These results are then compared to those derived from Herschel dust maps. The mass of a typical cloud is several 104M while the total mass in the dense molecular gas (>102cm–3) in W43 is found to be ∼ 1.9x106M. Probability distribution functions obtained from column density maps derived from molecular line data and Herschel imaging show a log-normal distribution for low column densities and a power-law tail for high densities. A flatter slope for the molecular line data probability distribution function may imply that those selectively show the gravitationally collapsing gas.

Abstract Copyright:

Journal keyword(s): ISM: structure - ISM: kinematics and dynamics - ISM: molecules - molecular data - stars: formation

VizieR on-line data: <Available at CDS (J/A+A/560/A24): list.dat fits/*>

Nomenclature: Fig. E.1, Tables 1-3: [CNS2013] NN (Nos 1-29).

CDS comments: Paragraph 2. G34.3 not identified (incomplete format).

Simbad objects: 39

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Number of rows : 39

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 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 943 3
2 NAME Per Arm PoG 03 30 +45.0           ~ 1197 0
3 RCW 36 HII 08 59 00.9 -43 44 10     15.20     ~ 123 0
4 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 919 2
5 [CNS2013] 19 MoC 18 45 50.9 -02 30 31           ~ 1 0
6 [CNS2013] 1 MoC 18 45 59.50 -02 29 08.3           ~ 1 0
7 GAL 029.96-00.02 Y*O 18 46 03.7 -02 39 21           ~ 327 1
8 [CNS2013] 20 MoC 18 46 04.00 -02 39 22.2           ~ 1 0
9 [CNS2013] 4 MoC 18 46 16.30 -02 15 39.3           ~ 1 0
10 [CNS2013] 15 MoC 18 46 22.60 -02 14 04.2           ~ 1 0
11 [CNS2013] 25 MoC 18 46 26.10 -02 19 11.5           ~ 1 0
12 [CNS2013] 16 MoC 18 46 43.30 -02 02 28.1           ~ 1 0
13 [CNS2013] 18 MoC 18 46 43.90 -02 53 59.6           ~ 1 0
14 [CNS2013] 5 MoC 18 46 59.10 -02 07 22.5           ~ 1 0
15 [CNS2013] 22 MoC 18 47 08.00 -02 29 32.3           ~ 1 0
16 [CNS2013] 24 MoC 18 47 09.50 -01 44 08.4           ~ 1 0
17 [CNS2013] 11 MoC 18 47 10.20 -02 18 37.7           ~ 1 0
18 [CNS2013] 2 MoC 18 47 15.50 -01 47 17.3           ~ 1 0
19 [CNS2013] 28 MoC 18 47 22.20 -02 09 25.2           ~ 1 0
20 [CNS2013] 14 MoC 18 47 22.60 -02 12 01.8           ~ 1 0
21 [CNS2013] 17 MoC 18 47 27.10 -01 44 59.1           ~ 1 0
22 [CNS2013] 9 MoC 18 47 29.50 -01 48 11.9           ~ 1 0
23 [CNS2013] 8 MoC 18 47 29.80 -02 49 38.1           ~ 1 0
24 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 425 0
25 [CNS2013] 13 MoC 18 47 36.40 -01 55 06.6           ~ 1 0
26 [CUS2014] G030.7016-0.0672 cor 18 47 36.6 -02 00 54           ~ 43 0
27 [CNS2013] 23 MoC 18 47 40.10 -02 20 24.3           ~ 1 0
28 [CNS2013] 29 MoC 18 47 48.60 -02 05 03.7           ~ 1 0
29 [CNS2013] 12 MoC 18 47 52.80 -02 03 33.5           ~ 1 0
30 [CNS2013] 3 MoC 18 47 54.50 -01 35 02.5           ~ 1 0
31 [CNS2013] 7 MoC 18 48 02.00 -01 55 34.3           ~ 1 0
32 [CNS2013] 10 MoC 18 48 10.60 -01 45 37.7           ~ 1 0
33 [CNS2013] 21 MoC 18 48 16.60 -02 07 06.0           ~ 1 0
34 [CNS2013] 6 MoC 18 48 30.70 -02 02 09.8           ~ 1 0
35 [CNS2013] 27 MoC 18 48 32.20 -01 55 28.8           ~ 1 0
36 [CNS2013] 26 MoC 18 48 38.10 -02 22 49.1           ~ 1 0
37 NAME Sgr Arm PoG 19 00 -30.0           ~ 496 1
38 NAME Galactic Bar reg ~ ~           ~ 828 0
39 NAME Scutum Spiral Arm PoG ~ ~           ~ 256 0

    Equat.    Gal    SGal    Ecl

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2019.11.21-23:48:11

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