2015ApJ...798...30L

Query : 2015ApJ...798...30L

2015ApJ...798...30L - Astrophys. J., 798, 30 (2015/January-1)

A feedback-driven bubble G24.136+00.436: a possible site of triggered star formation.

LIU H.-L., WU Y., LI J., YUAN J.-H., LIU T. and DONG X.

Abstract (from CDS):

We present a multi-wavelength study of the IR bubble G24.136+00.436. The J = 1-0 observations of 12CO, 13CO, and C18O were carried out with the Purple Mountain Observatory 13.7 m telescope. Molecular gas with a velocity of 94.8 km/s is found prominently in the southeast of the bubble, shaped as a shell with a total mass of ∼2x104 M☉. It was likely assembled during the expansion of the bubble. The expanding shell consists of six dense cores, whose dense (a few of 103/cm3) and massive (a few of 103 M☉) characteristics coupled with the broad linewidths (>2.5 km/s) suggest that they are promising sites for forming high-mass stars or clusters. This could be further consolidated by the detection of compact H II regions in Cores A and E. We tentatively identified and classified 63 candidate young stellar objects (YSOs) based on the Spitzer and UKIDSS data. They are found to be dominantly distributed in regions with strong molecular gas emission, indicative of active star formation, especially in the shell. The H II region inside the bubble is mainly ionized by a ∼O8V star(s), of the dynamical age of ∼1.6 Myr. The enhanced number of candidate YSOs and secondary star formation in the shell as well as the timescales involved, indicate a possible scenario for triggering star formation, signified by the "collect and collapse" process.

Abstract Copyright: ∼

Journal keyword(s): H II regions - ISM: bubbles - ISM: individual: G24.136+00.436 - ISM: molecules - stars: formation - stars: massive

Nomenclature: Fig. 4, Tables 1-2: [LWL2015] A (Nos A-F). Table 3: [LWL2015] NN (Nos 1-63).

Simbad objects: 80

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Number of rows : 80
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 W 5 East MoC 03 01 32 +60 29.2           ~ 130 2
2 SH 2-212 HII 04 40 36.52 +50 27 44.3           ~ 102 2
3 LBN 159.17+03.33 HII 04 58 45.7 +47 59 36           ~ 86 1
4 IC 443 SNR 06 17 00.0000000 +22 34 11.998901           ~ 1314 1
5 NGC 6634 ? 17 20 50 -35 47.0           ~ 11 0
6 SNR G006.4-00.1 SNR 18 00 31.2011719 -23 25 48.001099           ~ 782 1
7 [ABB2014] WISE G013.186+00.042 bub 18 14 06.2 -17 28 31           ~ 26 0
8 [CPA2006] N21 bub 18 25 31 -13 16.5           ~ 18 0
9 2MASS J18332130-0735077 Y*O 18 33 21.3025217136 -07 35 08.288224152           ~ 2 0
10 [LWL2015] 2 Y*O 18 33 24.076 -07 41 57.63           ~ 1 0
11 2MASS J18332580-0742327 Y*O 18 33 25.810 -07 42 32.72           ~ 1 0
12 SPICY 86111 Y*O 18 33 25.902 -07 42 38.76           ~ 2 0
13 2MASS J18332704-0740083 Y*O 18 33 27.045 -07 40 08.34           ~ 3 0
14 2MASS J18332748-0737228 Y*O 18 33 27.487 -07 37 22.88           ~ 1 0
15 [LWL2015] 7 Y*O 18 33 27.956 -07 35 11.34           ~ 1 0
16 2MASS J18332932-0737065 Y*O 18 33 29.323 -07 37 06.59           ~ 1 0
17 [LWL2015] 9 Y*O 18 33 30.166 -07 39 58.15           ~ 1 0
18 2MASS J18333089-0736056 Y*O 18 33 30.9097800960 -07 36 05.688857556           ~ 1 0
19 2MASS J18333174-0741177 Y*O 18 33 31.7441079864 -07 41 17.760679296           ~ 1 0
20 2MASS J18333312-0736439 Y*O 18 33 33.130 -07 36 43.92           ~ 1 0
21 SPICY 86161 Y*O 18 33 33.396 -07 33 40.50           ~ 2 0
22 2MASS J18333465-0738488 Y*O 18 33 34.656 -07 38 48.89           ~ 2 0
23 2MASS J18333528-0734496 Y*O 18 33 35.2829098656 -07 34 49.649421792           ~ 1 0
24 IRAS 18308-0741 IR 18 33 35.9 -07 38 51           ~ 6 0
25 2MASS J18333895-0743153 Y*O 18 33 38.9533286232 -07 43 15.469602420           ~ 1 0
26 [LWL2015] 17 Y*O 18 33 41.361 -07 39 12.69           ~ 1 0
27 [LWL2015] 18 Y*O 18 33 42.121 -07 35 12.10           ~ 1 0
28 2MASS J18334237-0731353 Y*O 18 33 42.3773339856 -07 31 35.550346260           ~ 1 0
29 2MASS J18334250-0740462 Y*O 18 33 42.510 -07 40 46.27           ~ 1 0
30 2MASS J18334334-0739040 Y*O 18 33 43.3469144256 -07 39 04.108259844           ~ 1 0
31 [ABB2014] WISE G024.139+00.432 bub 18 33 43.9 -07 37 16           ~ 8 0
32 SPICY 86238 Y*O 18 33 45.088 -07 39 01.28           ~ 2 0
33 [LPH96] 024.139+0.427 HII 18 33 46.3 -07 37 21           ~ 3 0
34 2MASS J18334632-0742035 Y*O 18 33 46.327 -07 42 03.57           ~ 1 0
35 SPICY 86245 Y*O 18 33 47.169 -07 38 03.09           ~ 2 0
36 2MASS J18334788-0735478 Y*O 18 33 47.8967622048 -07 35 47.953036140           ~ 1 0
37 2MASS J18334865-0734200 Y*O 18 33 48.658 -07 34 20.03           ~ 1 0
38 2MASS J18334948-0739063 Y*O 18 33 49.4875570464 -07 39 06.488633664           ~ 1 0
39 IRAS 18311-0735 Y*O 18 33 49.587 -07 32 45.68           ~ 2 0
40 2MASS J18334962-0742020 Y*O 18 33 49.6291577832 -07 42 02.182471524           ~ 1 0
41 2MASS J18335253-0739335 Y*O 18 33 52.535 -07 39 33.53           ~ 1 0
42 SPICY 86276 Y*O 18 33 52.755 -07 34 43.65           ~ 2 0
43 2MASS J18335361-0742284 Y*O 18 33 53.6154510984 -07 42 28.304904132           ~ 1 0
44 2MASS J18335390-0739518 Y*O 18 33 53.8969426128 -07 39 51.844892868           ~ 1 0
45 2MASS J18335405-0739413 Y*O 18 33 54.0556128936 -07 39 41.233294548           ~ 1 0
46 2MASS J18335444-0742036 Y*O 18 33 54.447 -07 42 03.68           ~ 1 0
47 [LWL2015] 36 Y*O 18 33 55.162 -07 37 19.97           ~ 1 0
48 SPICY 86295 Y*O 18 33 55.340 -07 37 18.47           ~ 2 0
49 2MASS J18335565-0732596 Y*O 18 33 55.659 -07 32 59.61           ~ 1 0
50 SPICY 86300 Y*O 18 33 55.662 -07 42 15.79           ~ 2 0
51 2MASS J18335628-0737043 Y*O 18 33 56.288 -07 37 04.31           ~ 3 0
52 IRAS 18312-0738 IR 18 33 57.3 -07 36 12           ~ 3 0
53 [LWL2015] 41 Y*O 18 33 57.350 -07 34 31.98           ~ 1 0
54 2MASS J18335746-0734162 Y*O 18 33 57.4671092472 -07 34 16.249386936           ~ 1 0
55 SPICY 86321 Y*O 18 33 57.501 -07 37 17.68           ~ 2 0
56 2MASS J18335795-0737186 Y*O 18 33 57.953 -07 37 18.61           ~ 3 0
57 2MASS J18335810-0731392 Y*O 18 33 58.1179330800 -07 31 39.075780972           ~ 1 0
58 2MASS J18335816-0739570 Y*O 18 33 58.1657757288 -07 39 56.984179464           ~ 1 0
59 ZTF J183358.20-073943.8 Y*O 18 33 58.1988956280 -07 39 43.973812584           ~ 4 0
60 [LWL2015] 48 Y*O 18 33 58.556 -07 36 41.38           ~ 1 0
61 2MASS J18335924-0732514 Y*O 18 33 59.246 -07 32 51.45           ~ 1 0
62 2MASS J18340028-0734222 Y*O 18 34 00.283 -07 34 22.28           ~ 1 0
63 2MASS J18340043-0737109 Y*O 18 34 00.436 -07 37 10.95           ~ 2 0
64 2MASS J18340132-0740474 Y*O 18 34 01.3209674688 -07 40 47.391520620           ~ 1 0
65 [LWL2015] 53 Y*O 18 34 01.5220485888 -07 33 42.142802040           ~ 1 0
66 2MASS J18340155-0742189 Y*O 18 34 01.5552345096 -07 42 18.963421488           ~ 1 0
67 2MASS J18340224-0738272 Y*O 18 34 02.2468290984 -07 38 27.173924160           ~ 1 0
68 2MASS J18340386-0740466 Y*O 18 34 03.869 -07 40 46.61           ~ 1 0
69 2MASS J18340456-0740022 Y*O 18 34 04.5658763208 -07 40 02.331084432           ~ 1 0
70 2MASS J18340511-0742218 Y*O 18 34 05.1167571000 -07 42 21.910303728           ~ 1 0
71 2MASS J18340546-0739481 Y*O 18 34 05.464 -07 39 48.14           ~ 1 0
72 2MASS J18340652-0739372 Y*O 18 34 06.5254511544 -07 39 37.300206744           ~ 1 0
73 SPICY 86419 Y*O 18 34 07.433 -07 38 47.10           ~ 2 0
74 SPICY 86422 Y*O 18 34 07.803 -07 37 45.61           ~ 2 0
75 2MASS J18340783-0736078 Y*O 18 34 07.8350788872 -07 36 07.871049108           ~ 1 0
76 [L89b] 28.823-00.226 bub 18 44 44.3 -03 45 34           ~ 80 0
77 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 1034 2
78 W 51a HII 19 23 29.3 +14 31 38           ~ 186 0
79 LBN 063.10+00.46 HII 19 49 11.7 +26 51 36   14.60 13.63     ~ 55 0
80 NGC 7538 OpC 23 13 37 +61 30.0           ~ 920 1

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