2016MNRAS.456.2425V


Query : 2016MNRAS.456.2425V

2016MNRAS.456.2425V - Mon. Not. R. Astron. Soc., 456, 2425-2445 (2016/March-1)

Star formation towards the southern cometary H II region IRAS 17256-3631.

VEENA V.S., VIG S., TEJ A., VARRICATT W.P., GHOSH S.K., CHANDRASEKHAR T. and ASHOK N.M.

Abstract (from CDS):

IRAS 17256-3631 is a southern Galactic massive star-forming region located at a distance of 2 kpc. In this paper, we present a multiwavelength investigation of the embedded cluster, the H ii region, as well as the parent cloud. Radio images at 325, 610 and 1372 MHz were obtained using Giant Metrewave Radio Telescope, India while the near-infrared imaging and spectroscopy were carried out using United Kingdom Infrared Telescope and Mt. Abu Infrared Telescope, India. The near-infrared K-band image reveals the presence of a partially embedded infrared cluster. The spectral features of the brightest star in the cluster, IRS-1, spectroscopically agree with a late O or early B star and could be the driving source of this region. Filamentary H2 emission detected towards the outer envelope indicates the presence of highly excited gas. The parent cloud is investigated at far-infrared to millimetre wavelengths and 18 dust clumps have been identified. The spectral energy distributions of these clumps have been fitted as modified blackbodies and the best-fitting peak temperatures are found to range from 14 to 33 K, while the column densities vary from 0.7 to 8.5x1022/ cm2. The radio maps show a cometary morphology for the distribution of ionized gas that is density bounded towards the north-west and ionization bounded towards the south-east. This morphology is better explained with the champagne flow model as compared to the bow-shock model. Using observations at near-, mid- and far-infrared, submillimetre and radio wavelengths, we examine the evolutionary stages of various clumps.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): stars: formation - H ii regions - ISM: individual objects: IRAS 17256-3631 - infrared: ISM - infrared: stars - radio continuum: ISM

Nomenclature: Fig. 5, Table 5: [VVT2016] CNN (Nos C1-C18). Fig. 9, Table 7: [VVT2016] IRS-1 N=1, [VVT2016] EGO-1 N=1.

Simbad objects: 31

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Number of rows : 31
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2606 2
2 NAME Gemini OB1 Molecular Cloud MoC 06 19.0 +23 00           ~ 35 0
3 GUM 29 HII 10 24 14.6 -57 46 58           ~ 196 0
4 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3891 2
5 QSO B1622-297 Bla 16 26 06.02083867 -29 51 26.9710860   18.41 20.5 17.6   ~ 383 0
6 HD 157060 PM* 17 22 37.9482545942 -35 54 38.186673855   6.954 6.419     F9V: 39 0
7 [VVT2016] C10 MoC 17 28 45.591 -36 35 39.65           ~ 2 0
8 [VVT2016] C13 MoC 17 28 54.820 -36 36 28.52           ~ 2 0
9 [VVT2016] C7 MoC 17 28 55.431 -36 34 09.92           ~ 2 0
10 [VVT2016] C12 MoC 17 28 57.160 -36 37 34.76           ~ 2 0
11 [VVT2016] C4 MoC 17 28 58.118 -36 32 07.71           ~ 2 0
12 [VVT2016] EGO-1 NIR 17 28 58.130 -36 32 05.10           ~ 2 0
13 [VVT2016] C1 MoC 17 28 58.399 -36 33 33.57           ~ 2 0
14 [VVT2016] C15 MoC 17 28 58.722 -36 36 11.46           ~ 2 0
15 [VVT2016] C6 MoC 17 29 00.282 -36 34 48.17           ~ 2 0
16 IRAS 17256-3631 HII 17 29 01.1 -36 33 38           ~ 10 0
17 [VVT2016] C3 MoC 17 29 01.149 -36 33 19.41           ~ 2 0
18 2MASS J17290138-3633543 NIR 17 29 01.3942391312 -36 33 54.335816864           ~ 2 0
19 [VVT2016] C14 MoC 17 29 05.008 -36 38 12.65           ~ 2 0
20 [VVT2016] C2 MoC 17 29 05.286 -36 33 16.16           ~ 2 0
21 [VVT2016] C9 MoC 17 29 05.807 -36 34 55.84           ~ 2 0
22 [VVT2016] C18 MoC 17 29 06.328 -36 36 35.52           ~ 2 0
23 [VVT2016] C8 MoC 17 29 10.854 -36 34 35.85           ~ 2 0
24 [VVT2016] C11 MoC 17 29 11.910 -36 32 08.88           ~ 2 0
25 [VVT2016] C5 MoC 17 29 15.564 -36 37 24.28           ~ 2 0
26 IRAS 17258-3637 HII 17 29 16.7 -36 40 13           ~ 54 0
27 [VVT2016] C16 MoC 17 29 16.880 -36 35 47.15           ~ 2 0
28 [VVT2016] C17 MoC 17 29 22.812 -36 34 34.38           ~ 2 0
29 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12320 0
30 NAME Sgr B MoC 17 47 02 -28 25.4           ~ 201 0
31 PKS 1827-36 rG 18 30 58.901 -36 02 30.33           ~ 63 1

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2021.08.04-10:40:56

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