2014A&A...570A..15L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:17:09

2014A&A...570A..15L - Astronomy and Astrophysics, volume 570A, 15-15 (2014/10-1)

The W43-MM1 mini-starburst ridge, a test for star formation efficiency models.

LOUVET F., MOTTE F., HENNEBELLE P., MAURY A., BONNELL I., BONTEMPS S., GUSDORF A., HILL T., GUETH F., PERETTO N., DUARTE-CABRAL A., STEPHAN G., SCHILKE P., CSENGERI T., NGUYEN LUONG Q. and LIS D.C.

Abstract (from CDS):

Star formation efficiency (SFE) theories are currently based on statistical distributions of turbulent cloud structures and a simple model of star formation from cores. They remain poorly tested, especially at the highest densities. We investigate the effects of gas density on the SFE through measurements of the core formation efficiency (CFE). With a total mass of ∼2x104M, the W43-MM1 ridge is one of the most convincing candidate precursors of Galactic starburst clusters and thus one of the best places to investigate star formation. We used high-angular resolution maps obtained at 3 mm and 1 mm within the W43-MM1 ridge with the IRAM Plateau de Bure Interferometer to reveal a cluster of 11 massive dense cores, and, one of the most massive protostellar cores known. A Herschel column density image provided the mass distribution of the cloud gas. We then measured the ``instantaneous'' CFE and estimated the SFE and the star formation rate (SFR) within subregions of the W43-MM1 ridge. The high SFE found in the ridge (∼6% enclosed in ∼8pc3) confirms its ability to form a starburst cluster. There is, however, a clear lack of dense cores in the eastern part of the ridge, which may be currently assembling. The CFE and the SFE are observed to increase with volume gas density, while the SFR per free fall time steeply decreases with the virial parameter, αvir. Statistical models of the SFR may describe the outskirts of the W43-MM1 ridge well, but struggle to reproduce its inner part, which corresponds to measurements at low αvir. It may be that ridges do not follow the log-normal density distribution, Larson relations, and stationary conditions forced in the statistical SFR models.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: protostars - stars: massive - ISM: clouds - submillimeter: ISM - submillimeter: stars

Nomenclature: Table 2: [LMH2014] NNN MDC (Nos N1 MDC-N11 MDC), [LMH2014] N12 dense core, [LMH2014] N1a HMPC (Nos N1a HMPC-N1b HMPC).

Simbad objects: 26

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Number of rows : 26

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 QSO J0217+0144 QSO 02 17 48.9547510 +01 44 49.698899   16.74 16.09 18.51 13.29 ~ 370 1
2 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5316 1
3 [PFD2013] MM1 cor 16 30 58.76 -48 43 53.4           ~ 5 0
4 4C 09.57 BLL 17 51 32.81857318 +09 39 00.7284829   17.46 16.78 15.57   ~ 811 1
5 ICRF J183005.9+061915 QSO 18 30 05.9399600344 +06 19 15.947596681       19.5   ~ 71 1
6 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 437 0
7 [LMH2014] N8 MDC cor 18 47 44.0 -01 54 36           ~ 1 0
8 [LMH2014] N4 MDC cor 18 47 44.6 -01 54 40           ~ 2 0
9 [LMH2014] N6 MDC cor 18 47 44.9 -01 54 44           ~ 2 0
10 [LMH2014] N3 MDC cor 18 47 45.7 -01 54 11           ~ 1 0
11 [LMH2014] N5 MDC cor 18 47 45.8 -01 54 33           ~ 1 0
12 [LMH2014] N10 MDC cor 18 47 46.4 -01 54 52           ~ 1 0
13 [LMH2014] N2 MDC cor 18 47 46.4 -01 54 32           ~ 3 0
14 [LMH2014] N7 MDC cor 18 47 46.5 -01 54 21           ~ 2 0
15 [LMH2014] N1b HMPC cor 18 47 46.8 -01 54 29           ~ 2 0
16 [MSL2003] W43-MM1 cor 18 47 47.0 -01 54 28           ~ 95 0
17 [LMH2014] N1 MDC cor 18 47 47.0 -01 54 26           ~ 2 0
18 [LMH2014] N1a HMPC cor 18 47 47.0 -01 54 26           ~ 2 0
19 [LMH2014] N11 MDC cor 18 47 47.8 -01 54 20           ~ 1 0
20 [LMH2014] N9 MDC cor 18 47 48.5 -01 54 34           ~ 1 0
21 [LMH2014] N12 dense core cor 18 47 49.6 -01 54 00           ~ 2 0
22 MSXDC G035.39-0.33 MoC 18 57 09.0 +02 07 46           ~ 82 0
23 QSO B1936-155 QSO 19 39 26.65774750 -15 25 43.0584183   19.44 19.4 18.80   ~ 145 1
24 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 618 1
25 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 707 0
26 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2505 2

    Equat.    Gal    SGal    Ecl

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2020.07.04-14:17:09

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