2006A&A...446..171Z

Query : 2006A&A...446..171Z

2006A&A...446..171Z - Astronomy and Astrophysics, volume 446171-184 (2006/1-4)

Triggered massive-star formation on the borders of Galactic HII regions. II. Evidence for the collect and collapse process around RCW 79.

ZAVAGNO A., DEHARVENG L., COMERON F., BRAND J., MASSI F., CAPLAN J. and RUSSEIL D.

Abstract (from CDS):

We present SEST-SIMBA 1.2-mm continuum maps and ESO-NTT SOFI JHKS images of the Galactic Hii region RCW 79. The millimetre continuum data reveal the presence of massive fragments located in a dust emission ring surrounding the ionized gas. The two most massive fragments are diametrically opposite each other in the ring. The near-IR data, centred on the compact HII region located at the south-eastern border of RCW 79, show the presence of an IR-bright cluster containing massive stars along with young stellar objects with near-IR excesses. A bright near- and mid-IR source is detected towards maser emissions, 1.2pc north-east of the compact HII region centre. Additional information extracted from the Spitzer GLIMPSE survey is used to discuss the nature of the bright IR sources observed towards RCW 79. Twelve luminous Class I sources are identified towards the most massive millimetre fragments. All these facts strongly indicate that the massive-star formation observed at the border of the HII region RCW 79 has been triggered by its expansion, most probably by the collect and collapse process.

Abstract Copyright: ∼

Journal keyword(s): stars: formation - stars: pre-main sequence - ISM: HII regions - ISM: individual objects: RCW 79

Nomenclature: Fig.3, Table 2: [ZDC2006] Condensation N (Nos 1-9). Table 3: [ZDC2006] Condensation 2 Cluster N=1, [ZDC2006] Condensation 2 Filament N=1, [ZDC2006] Condensation 2 NNN N=25, [ZDC2006] Condensation 2 A (No. A), [ZDC2006] Condensation 3 N (Nos 1-5), [ZDC2006] Condensation 4 N (Nos 1-6), [ZDC2006] Condensation 4 Nebula N=1.

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 - 2026 		#notes
1 [ZDC2006] Condensation 4 Nebula ISM 13 39 53.6 -61 41 21           ~ 1 0
2 [ZDC2006] Condensation 4 1 * 13 39 53.6639597904 -61 41 19.192170120           ~ 2 0
3 GRS G308.60 +00.60 HII 13 39.9 -61 45           ~ 108 0
4 [ZDC2006] Condensation 4 mm 13 39 54.00 -61 41 04.2           ~ 2 0
5 2MASS J13395422-6140571 Y*? 13 39 54.22968 -61 40 57.1872           ~ 2 0
6 [ZDC2006] Condensation 4 2 * 13 39 54.7 -61 41 13           ~ 1 0
7 2MASS J13395600-6140590 NIR 13 39 56.001 -61 40 59.06           ~ 2 0
8 2MASS J13395706-6140476 * 13 39 57.06 -61 40 47.7           ~ 1 0
9 [ZDC2006] Condensation 6 mm 13 40 08.11 -61 41 27.9           ~ 1 0
10 2MASS J13400894-6141389 Y*? 13 40 08.9410928256 -61 41 38.971278276           ~ 3 0
11 [ZDC2006] Condensation 7 mm 13 40 10.58 -61 42 23.9           ~ 1 0
12 [ZDC2006] Condensation 9 mm 13 40 19.90 -61 33 13.4           ~ 1 0
13 [ZDC2006] Condensation 8 mm 13 40 25.10 -61 32 27.0           ~ 1 0
14 SPICY 18370 Y*? 13 40 25.175 -61 47 48.13           ~ 2 0
15 [ZDC2006] Condensation 3 mm 13 40 25.45 -61 47 43.7           ~ 1 0
16 2MASS J13402653-6147559 AB? 13 40 26.537 -61 47 55.98           ~ 4 0
17 [ZDC2006] Condensation 5 mm 13 40 26.75 -61 36 16.1           ~ 1 0
18 2MASS J13402748-6147494 Y*? 13 40 27.48552 -61 47 49.4628           ~ 2 0
19 2MASS J13403264-6147201 Y*? 13 40 32.6483433744 -61 47 20.216606064           ~ 3 0
20 2MASS J13403830-6147001 Y*? 13 40 38.30 -61 47 00.2           ~ 2 0
21 [ZDC2006] Condensation 2 22 * 13 40 52.5 -61 45 52           Ms 1 0
22 [ZDC2006] Condensation 2 11 * 13 40 53.1 -61 46 11           ~ 1 0
23 [ZDC2006] Condensation 2 136 * 13 40 53.1 -61 45 51           Ms 1 0
24 MSX6C G308.7452+00.5482 MIR 13 40 53.1 -61 45 51           ~ 2 0
25 IRAS 13374-6130 HII 13 40 53.2 -61 45 47           ~ 10 0
26 [ZDC2006] Condensation 2 19 * 13 40 53.3 -61 45 53           Ms 1 0
27 [ZDC2006] Condensation 2 Cluster Cl* 13 40 53.4 -61 45 53           ~ 1 0
28 [ZDC2006] Condensation 2 46 * 13 40 53.5 -61 45 47           ~ 1 0
29 [ZDC2006] Condensation 2 6 * 13 40 53.8 -61 45 46           Ms 1 0
30 [ZDC2006] Condensation 2 154 NIR 13 40 54.0 -61 45 49           ~ 1 0
31 [ZDC2006] Condensation 2 15 * 13 40 54.3 -61 45 47           Ms 1 0
32 [ZDC2006] Condensation 2 372 NIR 13 40 54.4 -61 45 50           ~ 1 0
33 [ZDC2006] Condensation 2 85 * 13 40 54.9 -61 45 48           ~ 1 0
34 [ZDC2006] Condensation 1 mm 13 40 56.00 -61 45 51.7           ~ 1 0
35 [ZDC2006] Condensation 2 31 * 13 40 56.6 -61 45 39           ~ 1 0
36 [ZDC2006] Condensation 2 54 * 13 40 56.7790683480 -61 45 45.314520192           ~ 1 0
37 [ZDC2006] Condensation 2 Filament NIR 13 40 57 -61 45.7           ~ 1 0
38 [ZDC2006] Condensation 2 91 * 13 40 57.6 -61 45 44           ~ 2 0
39 [ZDC2006] Condensation 2 460 * 13 40 57.9 -61 45 42           ~ 1 0
40 [ZDC2006] Condensation 2 482 * 13 40 58.2 -61 45 45           ~ 1 0
41 2MASS J13405829-6146508 AB? 13 40 58.297 -61 46 50.88           ~ 4 0
42 [ZDC2006] Condensation 2 186 * 13 40 58.5 -61 46 48           ~ 2 0
43 [ZDC2006] Condensation 2 89 * 13 40 58.7 -61 46 52           ~ 2 0
44 [ZDC2006] Condensation 2 101 * 13 40 59.0 -61 46 50           ~ 1 0
45 2MASS J13410000-6146584 Y*? 13 41 00.00 -61 46 58.4           ~ 2 0
46 [ZDC2006] Condensation 2 237 * 13 41 02.3 -61 44 16           ~ 2 0
47 [ZDC2006] Condensation 2 4 * 13 41 02.5722580464 -61 44 45.695650632           ~ 1 0
48 [ZDC2006] Condensation 2 2 * 13 41 04.4508385128 -61 44 42.174254004           ~ 1 0
49 2MASS J13410515-6144472 * 13 41 05.16 -61 44 47.3           ~ 1 0
50 2MASS J13410530-6144363 * 13 41 05.30 -61 44 36.3           ~ 1 0
51 2MASS J13410538-6144595 * 13 41 05.39 -61 44 59.5           ~ 1 0
52 [ZDC2006] Condensation 2 mm 13 41 09.30 -61 44 32.8           ~ 2 0
53 SH 2-104 HII 20 17 52.5 +36 49 24           ~ 97 0

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