2016A&A...595A..27G


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.15CEST23:48:47

2016A&A...595A..27G - Astronomy and Astrophysics, volume 595A, 27-27 (2016/11-1)

Toward gas exhaustion in the W51 high-mass protoclusters.

GINSBURG A., GOSS W.M., GODDI C., GALVAN-MADRID R., DALE J.E., BALLY J., BATTERSBY C.D., YOUNGBLOOD A., SANKRIT R., SMITH R., DARLING J., KRUIJSSEN J.M.D. and LIU H.B.

Abstract (from CDS):

We present new JVLA observations of the high-mass cluster-forming region W51A from 2 to 16 GHz with resolution θfwhm~=0.3-0.5''. The data reveal a wealth of observational results: (1) Currently forming, very massive (proto-O) stars are traced by o-H2CO21,1-21,2 emission, suggesting that this line can be used efficiently as a massive protostar tracer; (2) there is a spatially distributed population of ≲mJy continuum sources, including hypercompact HII regions and candidate colliding wind binaries, in and around the W51 proto-clusters; and (3) there are two clearly detected protoclusters, W51e and W51 IRS2, that are gas-rich but may have most of their mass in stars within their inner ≤0.05pc. The majority of the bolometric luminosity in W51 most likely comes from a third population of OB stars between these clusters. The presence of a substantial population of exposed O-stars coincident with a population of still-forming massive stars, together with a direct measurement of the low mass loss rate via ionized gas outflow from W51 IRS2, implies that feedback is ineffective at halting star formation in massive protoclusters. Instead, feedback may shut off the large-scale accretion of diffuse gas onto the W51 protoclusters, implying that they are evolving toward a state of gas exhaustion rather than gas expulsion. Recent theoretical models predict gas exhaustion to be a necessary step in the formation of gravitationally bound stellar clusters, and our results provide an observational validation of this process.

Abstract Copyright: © ESO, 2016

Journal keyword(s): HII regions - circumstellar matter - radio continuum: ISM - radio lines: ISM - stars: massive - stars: protostars

VizieR on-line data: <Available at CDS (J/A+A/595/A27): phot.dat list.dat fits/*>

Nomenclature: Fig. 2, Table 3: W51aNN (Nos W51d3-d7, W51e9-e23) added. Figs 2+A.2, Tables 3-8: [GGG2016] arc N=1, [GGG2016] W51aNNw (Nos W51d3, W51d4e-W51d4w, W51d5-W51d7, W51e8n-W51e8s, W51e9-23), [GGG2016] W51aNNd (Nos W51d3d, W51e11d, W51e18d), [GGG2016] W51aNNmol (Nos W51e8mol, W51e10mol).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 29

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Number of rows : 29

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 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2060 1
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2079 1
3 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 180 0
4 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1511 1
5 M 42 HII 05 35 17.3 -05 23 28           ~ 3803 0
6 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 762 0
7 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5462 6
8 Cl Trumpler 14 OpC 10 43 56 -59 33.0   5.70 5.5     ~ 450 0
9 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 983 1
10 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3185 1
11 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12253 0
12 NAME HH 80-81 HH 18 19 06 -20 51.4           ~ 198 0
13 NAME W 51 GMC MoC 19 23 +14.6           ~ 20 0
14 [OMN2000] Region 3 PoC 19 23 29.3 +14 31 38           ~ 154 0
15 2MASX J19233591+1431288 Y*O 19 23 35.918 +14 31 28.83           ~ 5 0
16 NAME W 51 North Rad 19 23 40.0 +14 30 51           ~ 146 0
17 [WBN74] W 51 IRS 2 SFR 19 23 40.05 +14 31 07.1           ~ 257 0
18 [WBN74] W 51 IRS 2E Y*O 19 23 40.167 +14 31 06.63           ~ 21 0
19 [GW94] 15 * 19 23 40.97 +14 31 06.7           ~ 2 0
20 NAME W 51 IRS 1 PoC 19 23 41.9 +14 30 36           ~ 101 0
21 [GW94] 8 * 19 23 42.85 +14 30 27.9           ~ 2 0
22 [GW94] 7 * 19 23 42.94 +14 30 27.9           ~ 2 0
23 NAME W 51 Main reg 19 23 43.8 +14 30 37           ~ 133 0
24 [SZH2010] W51e2-NW Rad 19 23 43.870 +14 30 35.97           ~ 8 0
25 [SZH2010] W51e2-W Rad 19 23 43.900 +14 30 34.62           ~ 8 0
26 [SZH2010] W51e2-E Rad 19 23 43.960 +14 30 34.56           ~ 14 0
27 W 51 SNR 19 23 50 +14 06.0           ~ 1183 1
28 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 367 1
29 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 972 0

    Equat.    Gal    SGal    Ecl

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2021.06.15-23:48:47

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