2007A&A...472..835Z

Query : 2007A&A...472..835Z

2007A&A...472..835Z - Astronomy and Astrophysics, volume 472835-846 (2007/9-4)

Triggered star formation on the borders of the Galactic HII region RCW 120.

ZAVAGNO A., POMARES M., DEHARVENG L., HOSOKAWA T., RUSSEIL D. and CAPLAN J.

Abstract (from CDS):

To investigate the process of star formation triggered by the expansion of an HII region, we present a multi-wavelength analysis of the Galactic HII region RCW 120 and its surroundings. The collect and collapse model predicts that the layer of gas and dust accumulated between the ionization and shock fronts during the expansion of the HII region collapses and forms dense fragments, giving rise to potential sites of massive-star formation. The aim of our study is to look for such massive fragments and massive young stars on the borders of RCW 120. We mapped the RCW 120 region in the cold dust continuum emission at 1.2mm to search for these fragments. We supplemented this study with the available near- (2MASS) and mid-IR (GLIMPSE) data to locate the IR sources observed towards this region and to analyse their properties. We then compared the observational results with the predictions of Hosokawa & Inutsuka's model (2005ApJ...623..917H; 2006ApJ...646..240H). At 1.2mm we detected eight fragments towards this region, five located on its borders. The largest fragment has a mass of about 370M☉. Class I and Class II young stellar objects are detected all over the region, with some observed far from the ionization front. This result emphasises the possible importance of distant interactions between the radiation, escaping from the ionized region, and the surrounding medium.

Abstract Copyright: ∼

Journal keyword(s): stars: formation - stars: early-type - ISM: HII regions - ISM: individual objects: RCW 120

VizieR on-line data: <Available at CDS (J/A+A/472/835): table2.dat>

Nomenclature: Fig.4, Table 1: [ZPD2007] CN (Nos C1-C8). Table 2: [ZPD2007] NNCN, [ZPD2007] C4 object N (Nos 1-2), [ZPD2007] TIR exciting star, [ZPD2007] TIR NN (Nos 1-37), [ZPD2007] OUT NNout (Nos 1out to 45out).

Simbad objects: 141

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Number of rows : 141
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 3C 6 Rad 00 15 06.14742346 +32 16 13.3093056   18.0 16.8 15.61   ~ 33 1
2 GRS G308.60 +00.60 HII 13 39.9 -61 45           ~ 108 0
3 2MASS J17112512-3825186 Y*O 17 11 25.13 -38 25 18.6           ~ 2 0
4 2MASS J17112685-3825035 Y*O 17 11 26.851 -38 25 03.59           ~ 3 0
5 SPICY 48808 Y*O 17 11 27.552 -38 36 30.43           ~ 2 0
6 2MASS J17113147-3837068 Y*O 17 11 31.47 -38 37 06.9           ~ 2 0
7 2MASS J17113439-3819339 Y*O 17 11 34.391 -38 19 33.90           ~ 2 0
8 2MASS J17113751-3820573 Y*O 17 11 37.5151799952 -38 20 57.525173808           ~ 2 0
9 2MASS J17113931-3827049 Y*O 17 11 39.317 -38 27 04.98           ~ 6 0
10 2MASS J17114069-3827032 Y*O 17 11 40.70 -38 27 03.2           ~ 2 0
11 SPICY 48895 Y*O 17 11 48.430 -38 19 46.76           ~ 4 0
12 2MASS J17114905-3824053 Y*O 17 11 49.059 -38 24 05.35           ~ 5 0
13 SPICY 48903 Y*? 17 11 49.260 -38 19 55.26           ~ 3 0
14 SPICY 48904 Y*O 17 11 49.290 -38 19 40.89           ~ 5 0
15 2MASS J17114934-3830076 * 17 11 49.3432334616 -38 30 07.583684976           ~ 2 0
16 2MASS J17115069-3815423 Y*O 17 11 50.6931545832 -38 15 42.353300844           ~ 1 0
17 IRAS 17084-3816 Y*O 17 11 50.705 -38 19 55.34           ~ 8 0
18 HIGALBM G348.1307+00.5136 Y*O 17 11 51.519 -38 32 12.61           ~ 6 0
19 SSTGLMC G348.3031+00.6377 Y*O 17 11 51.99 -38 19 27.4           ~ 1 0
20 SPICY 48934 Y*O 17 11 56.310 -38 17 01.96           ~ 2 0
21 2MASS J17115721-3825178 Y*O 17 11 57.215 -38 25 17.80           ~ 3 0
22 2MASS J17115826-3840444 Y*O 17 11 58.27 -38 40 44.5           ~ 2 0
23 2MASS J17120091-3831400 Y*O 17 12 00.920 -38 31 40.02           ~ 5 0
24 SPICY 48962 Y*O 17 12 04.367 -38 30 32.33           ~ 4 0
25 [DZS2009] 53 Y*O 17 12 05.5005 -38 30 34.511           ~ 3 0
26 2MASS J17120567-3828177 Y*O 17 12 05.678 -38 28 17.80           ~ 4 0
27 2MASS J17120676-3827256 Y*O 17 12 06.7747190976 -38 27 25.623440532           ~ 3 0
28 2MASS J17120715-3830503 Y*O 17 12 07.15 -38 30 50.3           ~ 2 0
29 2MASS J17120758-3830561 Y*O 17 12 07.582 -38 30 56.15           ~ 3 0
30 2MASS J17120796-3830513 Y*? 17 12 07.970 -38 30 51.39           ~ 4 0
31 HIGALBM G348.1610+00.4689 Y*O 17 12 08.033 -38 32 19.13           ~ 7 0
32 2MASS J17120830-3820276 Y*O 17 12 08.2900168440 -38 20 27.756652920           ~ 1 0
33 2MASS J17120830-3831306 Y*O 17 12 08.3250798264 -38 31 30.183356928           ~ 2 0
34 2MASS J17120856-3832450 * 17 12 08.56 -38 32 45.1           ~ 1 0
35 2MASS J17120875-3830441 Y*? 17 12 08.75 -38 30 44.1           ~ 2 0
36 [DZS2009] 47 Y*O 17 12 08.8110 -38 30 53.902           ~ 2 0
37 2MASS J17120899-3832121 Y*? 17 12 09.00 -38 32 12.2           ~ 2 0
38 SPICY 48988 Y*O 17 12 09.085 -38 31 05.30           ~ 4 0
39 2MASS J17120941-3830530 Y*? 17 12 09.41 -38 30 53.1           ~ 1 0
40 2MASS J17120955-3831177 Y*O 17 12 09.556 -38 31 17.78           ~ 2 0
41 2MASS J17120968-3831298 Y*? 17 12 09.69 -38 31 29.9           ~ 2 0
42 2MASS J17121058-3832048 Y*O 17 12 10.59 -38 32 04.8           ~ 2 0
43 2MASS J17121061-3831348 Y*O 17 12 10.610 -38 31 34.84           ~ 4 0
44 HIGALBM G348.1709+00.4646 Y*O 17 12 10.9204 -38 31 59.696           ~ 5 0
45 SPICY 49000 Y*O 17 12 11.461 -38 15 58.33           ~ 2 0
46 2MASS J17121196-3831110 Y*O 17 12 11.97 -38 31 11.0           ~ 2 0
47 2MASS J17121248-3830570 Y*? 17 12 12.4943396448 -38 30 56.965817232           ~ 1 0
48 2MASS J17121263-3827259 Y*O 17 12 12.6363776904 -38 27 26.019454320           ~ 2 0
49 2MASS J17121314-3830500 Y*O 17 12 13.14 -38 30 50.0           ~ 3 0
50 2MASS J17121612-3829174 Y*O 17 12 16.1298845400 -38 29 17.294136360           ~ 2 0
51 2MASS J17121763-3828478 Y*O 17 12 17.6334515376 -38 28 47.821201428           ~ 2 0
52 SPICY 49019 Y*O 17 12 17.948 -38 34 41.69           ~ 4 0
53 SPICY 49023 Y*O 17 12 18.888 -38 34 07.40           ~ 2 0
54 SPICY 49025 Y*O 17 12 19.447 -38 29 17.89           ~ 2 0
55 2MASS J17121946-3833536 Y*O 17 12 19.47 -38 33 53.7           ~ 2 0
56 2MASS J17121971-3833434 Y*O 17 12 19.7218288776 -38 33 43.441779924           ~ 3 0
57 CD-38 11636 * 17 12 20.8455264407 -38 29 30.394099276 12 11.90 10.87 10.42   O8 47 1
58 IRAS 17089-3814 OH* 17 12 21.20832 -38 18 20.4588           O-rich 12 1
59 2MASS J17122159-3827074 Y*O 17 12 21.6087971160 -38 27 07.535124720           ~ 2 0
60 SPICY 49043 Y*O 17 12 21.619 -38 33 35.73           ~ 3 0
61 2MASS J17122262-3818375 Y*O 17 12 22.625 -38 18 37.50           ~ 2 0
62 2MASS J17122268-3820512 Y*O 17 12 22.687 -38 20 51.27           ~ 3 0
63 2MASS J17122294-3837438 * 17 12 22.95 -38 37 43.8           ~ 1 0
64 2MASS J17122306-3830578 Y*O 17 12 23.06 -38 30 57.8           ~ 2 0
65 2MASS J17122332-3816348 Y*O 17 12 23.329 -38 16 34.88           ~ 2 0
66 2MASS J17122354-3829562 Y*O 17 12 23.5505552064 -38 29 56.236067592           ~ 2 0
67 2MASS J17122364-3828257 Y*O 17 12 23.6498128488 -38 28 25.672218096           ~ 2 0
68 SPICY 49056 Y*O 17 12 23.700 -38 29 31.86           ~ 2 0
69 IRAS 17089-3834 Y*O 17 12 23.825 -38 37 55.05           ~ 4 0
70 SH 2-3 HII 17 12.4 -38 28           ~ 234 1
71 2MASS J17122426-3830273 Y*O 17 12 24.2809900872 -38 30 26.885743308           ~ 2 0
72 2MASS J17122495-3828077 Y*? 17 12 24.9522828552 -38 28 07.703867028           ~ 2 0
73 2MASS J17122502-3826351 Y*O 17 12 25.03 -38 26 35.2           ~ 2 0
74 2MASS J17122571-3830369 Y*? 17 12 25.6866175848 -38 30 37.086595704           ~ 1 0
75 2MASS J17122669-3830113 Y*? 17 12 26.6921568000 -38 30 11.414046564           ~ 2 0
76 SPICY 49077 Y*O 17 12 27.810 -38 25 57.70           ~ 2 0
77 2MASS J17122801-3828448 Y*O 17 12 28.02 -38 28 44.9           ~ 2 0
78 2MASS J17122834-3826055 Y*O 17 12 28.3486528584 -38 26 05.605184868           ~ 2 0
79 SPICY 49080 Y*O 17 12 28.350 -38 40 19.32           ~ 2 0
80 2MASS J17122839-3830488 Y*O 17 12 28.395 -38 30 48.86           ~ 3 0
81 2MASS J17122883-3828160 Y*? 17 12 28.8368698128 -38 28 16.037198400           ~ 2 0
82 2MASS J17122907-3828597 Y*O 17 12 29.07 -38 28 59.7           ~ 2 0
83 2MASS J17123001-3824107 Y*? 17 12 30.02 -38 24 10.7           ~ 2 0
84 2MASS J17123020-3820062 Y*O 17 12 30.1821374880 -38 20 06.194283252           ~ 1 0
85 2MASS J17123086-3825123 Y*? 17 12 30.8640124272 -38 25 12.333643572           ~ 3 0
86 [ZPD2007] TIR 20 Y*O 17 12 30.87 -38 33 22.5           ~ 1 0
87 2MASS J17123250-3827533 AB* 17 12 32.505 -38 27 53.37           O-rich 4 0
88 2MASS J17123269-3828474 Y*O 17 12 32.7056188680 -38 28 47.333699544           ~ 2 0
89 2MASS J17123275-3826054 Y*O 17 12 32.7555651480 -38 26 05.482483188           ~ 2 0
90 2MASS J17123297-3828559 Y*O 17 12 32.9704627704 -38 28 55.984215252           ~ 2 0
91 2MASS J17123326-3822070 Y*O 17 12 33.2576818368 -38 22 07.091021640           ~ 2 0
92 SPICY 49115 Y*O 17 12 33.523 -38 30 49.38           ~ 5 0
93 2MASS J17123365-3819523 Y*O 17 12 33.652 -38 19 52.32           ~ 5 0
94 2MASS J17123485-3824341 Y*O 17 12 34.8318565752 -38 24 34.181736120           ~ 2 0
95 2MASS J17123491-3829417 Y*O 17 12 34.9203222288 -38 29 41.790270300           ~ 2 0
96 2MASS J17123492-3832392 * 17 12 34.921 -38 32 39.25           ~ 2 0
97 2MASS J17123553-3825562 Y*O 17 12 35.5454134320 -38 25 56.234604072           ~ 2 0
98 2MASS J17123562-3827409 Y*O 17 12 35.6275852104 -38 27 40.910791392           ~ 2 0
99 2MASS J17123622-3831493 Y*? 17 12 36.23 -38 31 49.3           ~ 1 0
100 2MASS J17123637-3836551 Y*O 17 12 36.375 -38 36 55.12           ~ 2 0
101 2MASS J17123731-3825469 Y*? 17 12 37.3100167176 -38 25 46.936752600           ~ 3 0
102 2MASS J17123803-3826364 Y*? 17 12 38.04 -38 26 36.5           ~ 2 0
103 2MASS J17123807-3827020 Y*O 17 12 38.0844406872 -38 27 02.008604124           ~ 2 0
104 2MASS J17123831-3832044 * 17 12 38.32 -38 32 04.4           ~ 1 0
105 2MASS J17123917-3821224 Y*O 17 12 39.176 -38 21 22.49           ~ 6 0
106 2MASS J17124017-3820310 LP* 17 12 40.1765354016 -38 20 31.080933240           ~ 7 0
107 2MASS J17124054-3827040 Be* 17 12 40.5244485432 -38 27 04.132529388           ~ 1 0
108 2MASS J17124054-3820579 Y*O 17 12 40.54 -38 20 57.9           ~ 2 0
109 2MASS J17124072-3821334 Y*O 17 12 40.72 -38 21 33.4           ~ 4 0
110 2MASS J17124072-3821427 Y*O 17 12 40.73 -38 21 42.7           ~ 2 0
111 2MASS J17124082-3827295 Y*O 17 12 40.8301254072 -38 27 29.578567788           ~ 5 0
112 MSX6C G348.2940+00.4334 MIR 17 12 40.9 -38 27 08           ~ 2 0
113 2MASS J17124091-3829292 * 17 12 40.92 -38 29 29.3           ~ 1 0
114 2MASS J17124107-3828033 AB? 17 12 41.0730963360 -38 28 03.383683176           ~ 3 0
115 2MASS J17124110-3827171 Y*O 17 12 41.1105490464 -38 27 17.171019864           ~ 6 0
116 [ZPD2007] 2C2 Y*? 17 12 41.29 -38 31 15.0           ~ 1 0
117 SPICY 49158 Y*O 17 12 41.625 -38 27 17.92           ~ 2 0
118 2MASS J17124181-3826573 NIR 17 12 41.82 -38 26 57.3           ~ 1 0
119 2MASS J17124213-3830165 Y*O 17 12 42.133 -38 30 16.51           ~ 3 0
120 2MASS J17124216-3826578 Y*O 17 12 42.166 -38 26 57.87           ~ 5 0
121 [ZPD2007] C4 object 2 Be* 17 12 42.3025556832 -38 26 41.346104280           ~ 1 0
122 2MASS J17124273-3827060 Y*O 17 12 42.73 -38 27 06.0           ~ 2 0
123 2MASS J17124314-3822431 Y*O 17 12 43.1467412184 -38 22 43.071908376           ~ 3 0
124 SPICY 49166 Y*O 17 12 43.189 -38 23 31.02           ~ 2 0
125 SPICY 49167 Y*O 17 12 43.456 -38 22 24.90           ~ 4 0
126 2MASS J17124345-3822337 Y*O 17 12 43.46 -38 22 33.7           ~ 2 0
127 HIGALBM G348.3493+00.4627 Y*O 17 12 43.543 -38 23 24.68           ~ 5 0
128 2MASS J17124415-3826395 Y*O 17 12 44.15 -38 26 39.6           ~ 2 0
129 2MASS J17124459-3823299 Y*O 17 12 44.59 -38 23 29.9           ~ 2 0
130 2MASS J17124469-3825246 Y*O 17 12 44.6973417384 -38 25 24.659221692           ~ 1 0
131 [ZPD2007] 1C3 Y*O 17 12 45.39 -38 29 13.5           ~ 1 0
132 SPICY 49180 Y*O 17 12 45.400 -38 26 27.19           ~ 2 0
133 2MASS J17124603-3825247 Y*O 17 12 46.034 -38 25 24.72           ~ 7 0
134 2MASS J17124843-3825096 Y*O 17 12 48.435 -38 25 09.70           ~ 3 0
135 SSTGLMC G348.3889+00.4494 Y*O 17 12 54.02112 -38 21 57.1464           ~ 4 0
136 SPICY 49235 Y*O 17 13 00.748 -38 15 01.43           ~ 2 0
137 2MASS J17130968-3830231 Y*O 17 13 09.69 -38 30 23.1           ~ 2 0
138 SPICY 49265 Y*O 17 13 12.148 -38 31 47.72           ~ 3 0
139 2MASS J17131711-3817350 Y*O 17 13 17.117 -38 17 35.00           ~ 3 0
140 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
141 SH 2-104 HII 20 17 52.5 +36 49 24           ~ 97 0

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