2009A&A...504..139P


Query : 2009A&A...504..139P

2009A&A...504..139P - Astronomy and Astrophysics, volume 504, 139-159 (2009/9-2)

Multi-generation massive star-formation in NGC 3576.

PURCELL C.R., MINIER V., LONGMORE S.N., ANDRE P., WALSH A.J., JONES P., HERPIN F., HILL T., CUNNINGHAM M.R. and BURTON M.G.

Abstract (from CDS):

Recent 1.2-mm continuum observations have shown the giant H II region NGC3576 to be embedded in the centre of an extended filamentary dust-cloud. The bulk of the filament away from the H II region contains a number of clumps seen only at (sub-)millimetre wavelengths. Infrared and radio observations of the central star cluster have uncovered evidence of sequential star-formation leading us to believe that the adjacent clumps may host massive protostellar objects at a very early stage of evolution. We have investigated the physical and chemical conditions in the dusty clumps with the goal of characterising their star-forming content. We have used the Australia Telescope Compact Array (ATCA) to image the cloud for the NH3(1,1), (2,2) and (4,4) transitions, 22 GHz H2O masers, and 23GHz continuum emission. The 70-m Tidbinbilla dish was used to estimate the total integrated intensity of NH3. We also utilised the 22-m Mopra antenna to map the region for the molecular lines 13CO(1-0), C18O(1-0), HCO+(1-0), H13CO+(1-0), CS(1-0) and N2H+(1-0). Emission from dense molecular gas follows the morphology of the 1.2-mm dust emission, except towards the central ionised region. The H II region is observed to be expanding into the molecular cloud, sweeping up a clumpy shell of gas, while the central star cluster is dispersing the molecular gas to the east. Analysis of the NH3 data indicates that temperature and linewidth gradients exist in the western arm of the filament. Temperatures are highest adjacent to the central H II region, indicating that the embedded cluster of young stars there is heating the gas. Six new H2O masers were detected in the arms of the filament, all associated with NH3 emission peaks, confirming that star-formation has begun within these cores. Core masses range from 5 to 516M and most appear to be gravitationally bound. Complementary results by Andre et al. (2008A&A...490L..27A) imply that seven cores will go on to form massive stars between 15 and 50M. The large scale velocity structure of the filament is smooth, but at least one clump shows the signature of inward gas motions via asymmetries in the NH3(1,1) line profiles. The same clump exhibits an enhanced abundance of N2H+, which coupled with an absence of CO indicates depletion onto the dust grain surface. The HII region at the heart of NGC3576 is potentially triggering the formation of massive stars in the bulk of the associated cloud.

Abstract Copyright:

Journal keyword(s): ISM: molecules - stars: formation - HII regions - radio lines: ISM - ISM: abundances - stars: pre-main-sequence

Nomenclature: Text: [PML2009] SN (Nos S1-S5). Fig. 2, Table 6: [PML2009] SN-a (Nos S1a-S1c, S3a-S3c, S4a-S4b, S5a-S5b). Fig. 5, Table 3: [PML2009] MN (Nos M1-M9). Table 5: [PML2009] NN (Nos 1-25).

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

Simbad objects: 53

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Number of rows : 53
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 IC 1848 OpC 02 51 25 +60 25.1   6.87 6.5     ~ 478 2
2 QSO B0420-0127 QSO 04 23 15.80072217 -01 20 33.0656073   17.50 17.00 16.28   ~ 1148 3
3 SH 2-212 HII 04 40 36.50 +50 27 44.3           ~ 96 2
4 GUM 29 HII 10 24 14.6 -57 46 58           ~ 204 0
5 [PML2009] 25 cor 11 11 24.03 -61 21 25.3           ~ 1 0
6 [PML2009] 24 cor 11 11 24.25 -61 21 18.7           ~ 1 0
7 [PML2009] 23 cor 11 11 27.13 -61 21 07.3           ~ 1 0
8 [PML2009] 22 cor 11 11 32.84 -61 19 53.0           ~ 1 0
9 [PML2009] 21 cor 11 11 33.11 -61 21 11.6           ~ 1 0
10 [AMG2008] S5-M8 Mas 11 11 34.660 -61 21 11.09           ~ 4 0
11 [PML2009] 20 cor 11 11 35.62 -61 21 30.0           ~ 1 0
12 [PML2009] 19 cor 11 11 36.49 -61 20 07.0           ~ 1 0
13 [PML2009] S4-b cor 11 11 36.910 -61 20 03.13           ~ 1 0
14 [PML2009] 18 cor 11 11 37.92 -61 19 35.1           ~ 1 0
15 [PML2009] 17 cor 11 11 37.94 -61 21 06.5           ~ 1 0
16 [PML2009] 16 cor 11 11 38.11 -61 21 55.7           ~ 1 0
17 [PML2009] 15 cor 11 11 38.90 -61 20 15.6           ~ 1 0
18 [PML2009] 14 cor 11 11 39.38 -61 19 44.2           ~ 1 0
19 [AMG2008] S4-M6 Y*O 11 11 39.690 -61 19 43.18           ~ 5 0
20 [PML2009] 13 cor 11 11 41.86 -61 19 32.4           ~ 1 0
21 [AMG2008] S3-C3 Y*O 11 11 45.540 -61 18 45.27           ~ 3 0
22 [PML2009] 12 cor 11 11 45.66 -61 18 52.0           ~ 1 0
23 [PML2009] 11 cor 11 11 46.05 -61 18 43.4           ~ 1 0
24 [PML2009] 10 cor 11 11 48.39 -61 18 54.1           ~ 1 0
25 Caswell H2O 291.27-00.72 Mas 11 11 49.67 -61 18 53.8           ~ 4 0
26 NGC 3576 HII 11 11 49.8 -61 18 14           ~ 234 2
27 [PML2009] 9 cor 11 11 51.91 -61 18 22.2           ~ 1 0
28 [PML2009] 8 cor 11 11 52.45 -61 18 30.2           ~ 1 0
29 GAL 291.3-00.7 HII 11 11 52.9 -61 18 55           ~ 10 0
30 [AMG2008] S3-M4 Y*O 11 11 53.050 -61 18 31.37           ~ 3 0
31 2MASS J11115320-6118224 Y*O 11 11 53.21 -61 18 22.4           ~ 7 1
32 Caswell H2O 291.27-00.71 Mas 11 11 53.28 -61 18 24.1           ~ 14 0
33 NAME NGC 3576 IRS 1 HII 11 11 54.8 -61 18 26           ~ 31 1
34 Caswell H2O 291.28-00.71 Mas 11 11 56.58 -61 19 01.1           ~ 4 0
35 [PML2009] 7 cor 11 12 01.53 -61 18 58.7           ~ 1 0
36 [PML2009] 6 cor 11 12 04.76 -61 18 24.8           ~ 1 0
37 [PML2009] 5 cor 11 12 05.25 -61 18 49.3           ~ 1 0
38 [PML2009] 4 cor 11 12 08.91 -61 18 02.9           ~ 1 0
39 [PML2009] 3 cor 11 12 14.18 -61 17 21.2           ~ 1 0
40 [AMG2008] S1-M2 Y*O 11 12 14.430 -61 17 17.50           ~ 4 0
41 [PML2009] 2 cor 11 12 16.70 -61 17 39.0           ~ 1 0
42 [AMG2008] S1-M1 Y*O 11 12 17.210 -61 17 43.50           ~ 4 0
43 [PML2009] S1-a cor 11 12 21.090 -61 17 09.50           ~ 1 0
44 [PML2009] 1 cor 11 12 21.30 -61 17 11.5           ~ 1 0
45 RCW 57 HII 11 14.7 -61 12           ~ 15 0
46 GRS G308.60 +00.60 HII 13 39.9 -61 45           ~ 100 0
47 SH 2-3 HII 17 12.4 -38 28           ~ 194 1
48 M 16 OpC 18 18 45 -13 47.5   6.58 6.0     ~ 1006 2
49 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1138 1
50 [FP74] RCW 57 IRS 3 IR ~ ~           ~ 4 0
51 [FP74] RCW 57 IRS 5 IR ~ ~           ~ 4 0
52 [FP74] RCW 57 IRS 2 IR ~ ~           ~ 4 0
53 [FP74] RCW 57 IRS 4 IR ~ ~           ~ 4 0

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2023.02.01-20:36:46

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