2011A&A...525A.132P

Query : 2011A&A...525A.132P

2011A&A...525A.132P - Astronomy and Astrophysics, volume 525A132-132 (2011/1-1)

The HII region G35.673-00.847: another case of triggered star formation?

PARON S., PETRIELLA A. and ORTEGA M.E.

Abstract (from CDS):

As part of a systematic study that we are performing to increase the observational evidence of triggered star formation in the surroundings of HII regions, we analyze the ISM around the HII region G35.673-00.847, a poorly studied source. Using data from the large-scale surveys Two Micron All Sky Survey, Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE), MIPSGAL, Galactic Ring Survey (GRS), VLA Galactic Plane Survey (VGPS), and NRAO VLA Sky Survey (NVSS), we performed a multiwavelength study of G35.673-00.847 and its surroundings. The mid-IR emission shows that G35.673-00.847 has an almost semi-ring like shape with a cut towards the galactic west. The radius of this semi-ring is about 1.5' (∼1.6pc, at the distance of ∼3.7kpc). The distance was estimated from an HI absorption study and the analysis of the molecular gas. We find a molecular shell composed of several clumps distributed around the HII region, suggesting that its expansion is collecting the surrounding material. We identify several YSO candidates across the molecular shell. Finally, comparing the HII region dynamical age and the fragmentation time of the molecular shell, we discard the so-called collect and collapse as being the mechanism responsible for the YSO formation, suggesting that other processes such as radiative-driven implosion and/or small-scale Jeans gravitational instabilities operate.

Abstract Copyright: ∼

Journal keyword(s): HII regions - ISM: clouds - stars: formation

Simbad objects: 61

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Number of rows : 61
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 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
2 2MASS J18592453+0204056 Y*? 18 59 24.533 +02 04 05.66           ~ 2 0
3 2MASS J18592565+0205249 Y*? 18 59 25.655 +02 05 24.95           ~ 2 0
4 SSTGLMC G035.6947-00.8282 Y*? 18 59 25.800 +02 04 49.53           ~ 1 0
5 2MASS J18592635+0204061 Y*? 18 59 26.357 +02 04 06.13           ~ 2 0
6 2MASS J18592647+0204183 Y*? 18 59 26.472 +02 04 18.37           ~ 2 0
7 2MASS J18592664+0204362 * 18 59 26.650 +02 04 36.21           ~ 1 0
8 2MASS J18592697+0202073 * 18 59 26.9816489496 +02 02 07.250246700           ~ 1 0
9 SPICY 96251 Y*? 18 59 27.285 +02 03 53.21           ~ 2 0
10 [L89b] 35.673-00.847 HII 18 59 27.3 +02 03 09           ~ 8 0
11 2MASS J18592785+0203304 LP? 18 59 27.8526671010 +02 03 30.415016410           O 2 0
12 2MASS J18592786+0203057 * 18 59 27.862 +02 03 05.79           O 2 0
13 SSTGLMC G035.7025-00.8342 Y*? 18 59 27.937 +02 05 04.91           ~ 1 0
14 2MASS J18592851+0205251 Y*? 18 59 28.515 +02 05 25.11           ~ 1 0
15 SSTGLMC G035.6961-00.8415 Y*? 18 59 28.786 +02 04 32.45           ~ 1 0
16 2MASS J18592897+0202470 * 18 59 28.9803484680 +02 02 46.978185264           ~ 1 0
17 NVSS J185929+020334 Rad 18 59 29.14 +02 03 34.4           ~ 2 0
18 2MASS J18592919+0203395 Y*? 18 59 29.191 +02 03 39.52           ~ 1 0
19 2MASS J18592979+0202149 * 18 59 29.793 +02 02 14.94           ~ 1 0
20 SSTGLMC G035.6826-00.8533 Y*? 18 59 29.829 +02 03 29.73           ~ 1 0
21 2MASS J18593016+0204431 * 18 59 30.161 +02 04 43.19           ~ 1 0
22 2MASS J18593041+0202363 * 18 59 30.4163882952 +02 02 36.245355360           O 1 0
23 2MASS J18593057+0202486 * 18 59 30.579 +02 02 48.69           ~ 1 0
24 UCAC3 185-188370 PM* 18 59 30.7619009472 +02 05 22.494064776       12.96   ~ 1 0
25 2MASS J18593189+0203454 * 18 59 31.897 +02 03 45.44           O 1 0
26 2MASS J18593204+0204495 * 18 59 32.040 +02 04 49.51           O 1 0
27 2MASS J18593238+0202257 Y*? 18 59 32.389 +02 02 25.76           ~ 1 0
28 SSTGLMC G035.6790-00.8687 Y*? 18 59 32.714 +02 02 52.81           ~ 1 0
29 UCAC2 32587423 * 18 59 32.9767216056 +02 02 52.896325272       13.12   ~ 1 0
30 2MASS J18593472+0204518 * 18 59 34.729 +02 04 51.87           O 1 0
31 2MASS J18593556+0200488 * 18 59 35.5667382120 +02 00 48.799931076           O 2 0
32 2MASS J18593563+0203404 * 18 59 35.632 +02 03 40.44           O 1 0
33 2MASS J18593584+0200579 * 18 59 35.8456547400 +02 00 57.959114148           O 2 0
34 2MASS J18593725+0201066 * 18 59 37.254 +02 01 06.66           ~ 1 0
35 2MASS J18593743+0200411 * 18 59 37.434 +02 00 41.14           O 1 0
36 2MASS J18593814+0202141 Y*? 18 59 38.142 +02 02 14.15           ~ 1 0
37 NVSS J185938+020012 Rad 18 59 38.27 +02 00 12.3           ~ 2 0
38 2MASS J18593887+0200288 * 18 59 38.872 +02 00 28.84           O 1 0
39 2MASS J18593919+0201112 Y*? 18 59 39.199 +02 01 11.26           ~ 1 0
40 2MASS J18593936+0200385 Y*? 18 59 39.364 +02 00 38.55           ~ 1 0
41 2MASS J18593976+0203243 Y*? 18 59 39.768 +02 03 24.31           ~ 3 0
42 2MASS J18594015+0200255 * 18 59 40.158 +02 00 25.56           O 1 0
43 2MASS J18594151+0200334 Y*? 18 59 41.515 +02 00 33.40           ~ 1 0
44 2MASS J18594172+0159494 Y*? 18 59 41.725 +01 59 49.46           ~ 1 0
45 SSTGLMC G035.6717-00.9298 Y*? 18 59 44.976 +02 00 48.82           ~ 1 0
46 SPICY 96356 Y*? 18 59 45.148 +02 00 22.51           ~ 2 0
47 SPICY 96364 Y*? 18 59 46.502 +02 03 09.95           ~ 2 0
48 SSTGLMC G035.7099-00.9193 Y*? 18 59 46.929 +02 03 08.40           ~ 1 0
49 SSTGLMC G035.7201-00.9180 Y*? 18 59 47.763 +02 03 43.25           ~ 1 0
50 2MASS J18594892+0203200 AB? 18 59 48.930 +02 03 20.08           ~ 3 0
51 2MASS J18594947+0159069 Y*? 18 59 49.472 +01 59 06.91           ~ 1 0
52 2MASS J18594958+0203322 Y*? 18 59 49.581 +02 03 32.22           ~ 2 0
53 2MASS J18594981+0203006 Y*? 18 59 49.815 +02 03 00.65           ~ 3 0
54 SSTGLMC G035.7032-00.9430 Y*? 18 59 51.249 +02 02 08.28           ~ 1 0
55 2MASS J18595198+0202411 Y*? 18 59 51.981 +02 02 41.11           ~ 2 0
56 2MASS J18595199+0202308 Y*? 18 59 51.999 +02 02 30.85           ~ 1 0
57 2MASS J18595698+0159464 Y*? 18 59 56.982 +01 59 46.41           ~ 1 0
58 IRAS 18574+0155 AB? 18 59 57.158 +01 59 50.37           ~ 4 0
59 2MASS J18595760+0159412 Y*? 18 59 57.600 +01 59 41.21           ~ 2 0
60 2MASS J18595838+0159469 Y*? 18 59 58.385 +01 59 46.92           ~ 2 0
61 2MASS J18595949+0200042 Y*? 18 59 59.5041910944 +02 00 04.799177136           ~ 1 0

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