2014MNRAS.437..606T

Query : 2014MNRAS.437..606T

2014MNRAS.437..606T - Mon. Not. R. Astron. Soc., 437, 606-621 (2014/January-1)

Herschel, Spitzer and Magellan infrared observations of the star-forming region RCW 121 (IRAS 17149-3916).

TAPIA M., PERSI P., ROTH M., ELIA D., MOLINARI S., SALDANO H.P. and GOMEZ M.

Abstract (from CDS):

We present new deep near-infrared broad- and narrow-band imaging and low-resolution spectroscopy of the star formation region RCW 121 (IRAS 17149-3916) which we analyse in combination with Herschel (70, 160, 250, 350 and 500µm) and Spitzer (3.6, 4.5, 5.8 and 8µm) images. The near-infrared photometry reveals the presence of a stellar cluster of approximate size of 92arcsec which is composed of at least 264 members, approximately 25 per cent of these showing excess emission at λ > 2.0µm, indicative of circumstellar discs. Isochrones corresponding to ages 0.5-1.0 Myr and AV = 7.8 fit well the position of a large fraction of likely cluster members in the Ks versus H - Ks diagram. We find three massive star-forming cores located in the boundaries of an expanding Hii region ionized by a central O-type star. From their far-infrared spectral energy distributions (SEDs) we derive masses and temperatures of the dense cores. When these young stellar objects (YSOs) have warm emission components, the 1.2-500µm SEDs are fitted with Robitaille et al.'s star-disc-envelope model to obtain their physical parameters. The masses of the three YSOs are between 8 and 10 M☉. The youngest site (core I) is undetected at λ < 100µm and is at the earliest evolutionary stage that can currently be detected. The other two cores (II and III) contain YSOs of similar masses and have near-infrared counterparts, which imply a more advanced evolutionary stage. The YSO at core II has been found to have associated a jet, with strong H2 line emission, co-existing with an H2O maser source. RCW 121 is another example of multiple star formation being triggered by the expansion of a single Hii region.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): circumstellar matter - stars: formation - infrared: ISM

VizieR on-line data: <Available at CDS (J/MNRAS/437/606): jhkphot.dat>

Nomenclature: jhkphot.dat: [TPR2014] NNNN N=1602 among (Nos 3-4012). Fig. 2, Table 1: [TPR2014] IRAS 17149 AN (Nos A1-A5, B1-B3, C1-C3). Fig. 5, Table 4: [TPR2014] IRAS 17149-R (Nos I-III). Table 5: [TPR2014] JHHMMSS.ss+DDMMSS.s N=37. Fig. 1b, Paragr. 2.1: [TPR2014] H2 knot N=1.

Errata: erratum vol. 438, p. 2716 (2014)

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

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 SH 2-3 HII 17 12.4 -38 28           ~ 234 1
2 [TPR2014] IRAS 17149-I IR 17 18 18.9 -39 19 04           ~ 1 0
3 [BBC2006] IRAS 17149-3916 Clump 2 cor 17 18 19.1 -39 18 54           ~ 3 0
4 2MASS J17182054-3918125 * 17 18 20.5493646888 -39 18 12.588437448           ~ 1 0
5 [TPR2014] J171821.10-391836.1 NIR 17 18 21.10 -39 18 36.1           ~ 1 0
6 2MASS J17182117-3918382 NIR 17 18 21.1619651184 -39 18 38.236600044           ~ 1 0
7 2MASS J17182148-3919138 NIR 17 18 21.4456614720 -39 19 13.620548064           ~ 1 0
8 2MASS J17182155-3918314 NIR 17 18 21.552 -39 18 31.45           ~ 1 0
9 2MASS J17182169-3919219 NIR 17 18 21.697 -39 19 21.93           ~ 1 0
10 [TPR2014] J171821.93-391832.8 NIR 17 18 21.93 -39 18 32.8           ~ 1 0
11 2MASS J17182205-3919111 NIR 17 18 22.060 -39 19 11.18           ~ 1 0
12 2MASS J17182221-3918422 NIR 17 18 22.216 -39 18 42.24           ~ 1 0
13 2MASS J17182235-3918210 NIR 17 18 22.355 -39 18 21.02           ~ 1 0
14 [BBC2006] IRAS 17149-3916 Clump 3 cor 17 18 22.5 -39 18 38           ~ 3 0
15 2MASS J17182285-3918224 NIR 17 18 22.856 -39 18 22.45           ~ 1 0
16 2MASS J17182328-3919077 NIR 17 18 23.287 -39 19 07.77           ~ 1 0
17 2MASS J17182329-3918272 * 17 18 23.2893674520 -39 18 27.244991052           ~ 1 0
18 2MASS J17182331-3918561 NIR 17 18 23.320 -39 18 56.14           ~ 1 0
19 [TPR2014] IRAS 17149 B3 * 17 18 23.37 -39 18 44.4           ~ 2 0
20 [TPR2014] IRAS 17149-II IR 17 18 23.4 -39 18 42           ~ 1 0
21 [TPR2014] J171823.41-391831.3 NIR 17 18 23.41 -39 18 31.3           ~ 1 0
22 [TPR2014] IRAS 17149 A2 GNe 17 18 23.45 -39 18 39.3           ~ 1 0
23 [TPR2014] IRAS 17149 A3 Y*O 17 18 23.47 -39 18 40.5           ~ 1 0
24 [TPR2014] IRAS 17149 A4 GNe 17 18 23.51 -39 18 44.6           ~ 1 0
25 [TPR2014] H2 knot out 17 18 23.52 -39 18 41.4           ~ 1 0
26 WRAY 16-260 PN 17 18 23.7977659800 -39 19 04.162387368           ~ 2 0
27 [TPR2014] IRAS 17149 A5 * 17 18 23.81 -39 18 52.2           ~ 1 0
28 [TPR2014] IRAS 17149 B2 GNe 17 18 23.81 -39 18 41.7           ~ 1 0
29 SH 2-4 HII 17 18 23.9 -39 19 10           ~ 85 4
30 [BBC2006] IRAS 17149-3916 Clump 1 cor 17 18 23.9 -39 19 18           ~ 3 0
31 [TPR2014] J171824.00-391915.3 NIR 17 18 24.00 -39 19 15.3           ~ 1 0
32 [DBS2003] 118 Cl* 17 18 24 -39 19.1           ~ 5 1
33 [TPR2014] IRAS 17149-III IR 17 18 24.4 -39 19 25           ~ 1 0
34 [TPR2014] IRAS 17149 C3 Y*O 17 18 24.40 -39 19 24.6           ~ 1 0
35 2MASS J17182441-3918097 NIR 17 18 24.418 -39 18 09.76           ~ 1 0
36 [TPR2014] J171824.47-391840.8 NIR 17 18 24.47 -39 18 40.8           ~ 1 0
37 [TPR2014] J171824.66-391848.8 NIR 17 18 24.66 -39 18 48.8           ~ 1 0
38 2MASS J17182464-3918415 NIR 17 18 24.6610999608 -39 18 41.461382700           ~ 1 0
39 2MASS J17182511-3918464 NIR 17 18 25.114 -39 18 46.41           ~ 1 0
40 2MASS J17182525-3918375 NIR 17 18 25.2568761552 -39 18 37.584312948           ~ 1 0
41 2MASS J17182528-3918247 * 17 18 25.2930965568 -39 18 24.704790480           ~ 1 0
42 [BKH2005] 17149nr895 * 17 18 25.4637808440 -39 19 08.358688020           ~ 4 0
43 2MASS J17182568-3918266 * 17 18 25.6876610736 -39 18 26.625317076           ~ 1 0
44 HD 323047 * 17 18 25.9484932896 -39 18 00.791042148   11.07 10.05     K2 4 0
45 2MASS J17182674-3919344 NIR 17 18 26.748 -39 19 34.45           ~ 1 0
46 2MASS J17182701-3919043 NIR 17 18 27.013 -39 19 04.32           ~ 1 0
47 [TPR2014] J171827.12-391942.6 NIR 17 18 27.12 -39 19 42.6           ~ 1 0
48 2MASS J17182783-3917584 NIR 17 18 27.833 -39 17 58.42           ~ 1 0
49 2MASS J17182814-3919246 NIR 17 18 28.1586806280 -39 19 24.575612160           ~ 1 0
50 2MASS J17182830-3919497 LP? 17 18 28.2955913021 -39 19 49.738248993           ~ 2 0
51 2MASS J17182871-3919155 * 17 18 28.7226766776 -39 19 15.578619852           ~ 1 0
52 2MASS J17182889-3919214 NIR 17 18 28.895 -39 19 21.46           ~ 1 0
53 [BBC2006] IRAS 17149-3916 Clump 4 cor 17 18 29.4 -39 19 02           ~ 2 0

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