2019MNRAS.485.1775I

Query : 2019MNRAS.485.1775I

2019MNRAS.485.1775I - Mon. Not. R. Astron. Soc., 485, 1775-1799 (2019/May-2)

Initial phases of high-mass star formation: a multiwavelength study towards the extended green object G12.42+0.50.

ISSAC N., TEJ A., LIU T., VARRICATT W., VIG S., ISHWARA CHANDRA C.H. and SCHULTHEIS M.

Abstract (from CDS):

We present a multiwavelength study of the extended green object, G12.42+0.50, in this paper. The associated ionized, dust, and molecular components of this source are studied in detail employing various observations at near-, mid- and far-infrared, submillimetre, and radio wavelengths. Radio continuum emission mapped at 610 and 1390 MHz, using the Giant Meterwave Radio Telescope, India, advocates for a scenario of coexistence of an UC H II region and an ionized thermal jet possibly powered by the massive young stellar object, IRAS 18079-1756, with an estimated spectral type of B1-B0.5. Shock-excited lines of H2 and [Fe II], as seen in the near-infrared spectra obtained with UKIRT-UIST, lend support to this picture. Cold dust emission shows a massive clump of mass 1375 M☉ enveloping G12.42+0.50. Study of the molecular gas kinematics using the MALT90 and JCMT archival data unravels the presence of both infall activity and large-scale outflow suggesting an early stage of massive star formation in G12.42+0.50. A network of filamentary features are also revealed merging with the massive clump, mimicking a hub-filament layout. Velocity structure along these indicates bulk inflow motion.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: formation - ISM: H ii regions - ISM: individual objects: (G12.42+0.50) - ISM: jets and outflows - infrared: ISM - infrared: stars - radio continuum: ISM

Nomenclature: Fig. 2, Table 4: [ITL2019] RN (Nos R1-R2). Fig. 7, Table 6: [ITL2019] SMAN (Nos SMA1-SMA3). Fig. 9, Table 8: [ITL2019] CNN (Nos C1-C12).

Simbad objects: 42

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Number of rows : 42
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 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
2 GAL 174.20-00.08 Cld 05 30 45.9 +33 47 56           ~ 210 2
3 GAL 192.16-03.82 HII 05 58 13.4 +16 32 00           ~ 145 1
4 IRAS 07427-2400 HII 07 44 51.997 -24 07 42.11           ~ 78 0
5 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
6 NAME RCW 106 GMC MoC 16 21.0 -50 30           ~ 57 0
7 SDC G335.579-0.292 DNe 16 30 58.00 -48 44 16.3           ~ 45 0
8 [LUL2016] G351.776 -0.527 smm 17 26 35 -36 09.5           ~ 5 0
9 HD 163336 PM* 17 56 19.0354512072 -15 48 45.101447424   5.967 5.929     A0V 71 0
10 [ITL2019] C7 MoC 18 10 19.160 -17 59 27.19           ~ 1 0
11 [ITL2019] C6 MoC 18 10 23.080 -17 59 55.48           ~ 1 0
12 [ITL2019] C5 MoC 18 10 27.030 -17 58 17.79           ~ 1 0
13 [ITL2019] C10 MoC 18 10 35.810 -18 00 52.40           ~ 1 0
14 [ITL2019] C3 MoC 18 10 36.910 -17 55 02.54           ~ 1 0
15 [ITL2019] C4 MoC 18 10 37.830 -17 58 04.57           ~ 1 0
16 [ITL2019] C12 MoC 18 10 38.730 -18 02 02.59           ~ 1 0
17 [ITL2019] C9 MoC 18 10 38.760 -18 00 24.61           ~ 1 0
18 [ITL2019] C2 MoC 18 10 42.750 -17 57 08.92           ~ 1 0
19 [SPK2012] MWP1G012419+005399 bub 18 10 43.2 -17 54 44           ~ 2 0
20 [ABB2014] WISE G012.418+00.539 bub 18 10 43.4 -17 54 53           ~ 3 0
21 [ITL2019] C11 MoC 18 10 43.670 -18 00 24.95           ~ 1 0
22 [ITL2019] C8 MoC 18 10 43.710 -17 58 04.98           ~ 1 0
23 SDC G12.408+0.512 DNe 18 10 47.90 -17 56 03.5           ~ 3 0
24 [ITL2019] C1 MoC 18 10 49.640 -17 55 59.40           ~ 1 0
25 [ITL2019] R2 Rad 18 10 50.760 -17 55 52.80           ~ 1 0
26 [ITL2019] SMA3 mm 18 10 50.80 -17 55 52.8           ~ 1 0
27 AGAL G012.418+00.506 cor 18 10 51.09792 -17 55 49.6272           ~ 74 0
28 [ITL2019] R1 Rad 18 10 51.100 -17 55 49.30           ~ 1 0
29 [ITL2019] SMA1 mm 18 10 51.30 -17 55 46.3           ~ 2 0
30 [ITL2019] SMA2 mm 18 10 51.40 -17 55 48.1           ~ 2 0
31 [BE83] Maser 012.42+00.50 Mas 18 10 51.8 -17 55 56           ~ 10 0
32 SDC G12.427+0.502 DNe 18 10 52.57 -17 55 23.1           ~ 3 0
33 [BSM2002] 18151-1208 2 cor 18 17 50.36 -12 07 54.8           ~ 18 0
34 [BSM2002] 18151-1208 3 cor 18 17 52.17 -12 06 55.5           ~ 9 0
35 IRAS 18151-1208 Y*O 18 17 58.1254 -12 07 24.893           ~ 114 0
36 EGO G019.88-0.53 of? 18 29 14.7 -11 50 23           ~ 14 0
37 EGO G022.04+0.22 of? 18 30 34.7 -09 34 47           ~ 23 0
38 SDC G22.039+0.219 DNe 18 30 35.35 -09 34 50.1           ~ 10 0
39 [DLW84] G35.2N HII 18 58 13.036 +01 40 36.00           ~ 138 0
40 EGO G049.27-0.34 of? 19 23 06.7 +14 20 13           ~ 20 0
41 QSO B1921-293 BLL 19 24 51.05595254 -29 14 30.1210248   18.71 18.21 15.07   ~ 918 1
42 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2

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