2019AJ....158...18H


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.29CET22:05:04

2019AJ....158...18H - Astron. J., 158, 18-18 (2019/July-0)

APEX millimeter observations of methanol emission toward high-mass star-forming cores.

HERNANDEZ-HERNANDEZ V., KURTZ S., KALENSKII S., GOLYSHEVA P., GARAY G., ZAPATA L. and BERGMAN P.

Abstract (from CDS):

We present 247 GHz molecular line observations of methanol (CH3OH) toward 16 massive star-forming regions using the APEX telescope with an angular resolution of 25''. The sample covers a range of evolutionary states, including warm molecular cores (WMCs), hot molecular cores, and ultracompact H II regions. The hot cores, all of which include UC H II regions, show rich molecular line spectra, although the strength of different species and transitions varies from source to source. In contrast, the warm cores do not show significant molecular line emission. Multiple methanol transitions are detected toward nine of the hot cores; eight of these had enough transitions to use the rotation diagram method to estimate rotational temperatures and column densities. The temperatures lie in the range of 104-190 K and column densities from 3 x 1016 to 7 x 1018 cm–2. Using the average methanol line parameters, we estimate virial masses, which fall in the range from 145 to 720 M and proved to be significantly higher than the measured gas masses. We discuss possible scenarios to explain the chemical differences between hot cores and WMCs. One of the observed methanol lines, 42-51A+ at 247.228 GHz, is predicted to show Class II maser emission, similar in intensity to previously reported J0-J–1E masers at 157 GHz. We did not find any clear evidence for maser emission among the observed sources, however, a weak maser in this line may exist in G345.01+1.79.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: molecules - masers - stars: formation - stars: massive - stars: protostars

Simbad objects: 23

goto Full paper

goto View the reference in ADS

Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 935 2
2 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 173 0
3 IRAS 16533-4009 HII 16 56 45.58 -40 14 32.4           ~ 46 0
4 NGC 6302 PN 17 13 44.339 -37 06 10.95   7.1 10.10     ~ 750 1
5 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 201 1
6 NAME NGC 6334 I(N) smm 17 20 54 -35 45.0           ~ 121 1
7 IRAS 17233-3606 HII 17 26 42.8 -36 09 17           ~ 67 0
8 MMB G358.931-00.030 SFR 17 43 10.02 -29 51 45.8           ~ 13 0
9 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 185 0
10 W 31 SFR 18 10 28.6 -19 55 51           ~ 241 0
11 W 31c HII 18 10 29.1 -19 56 05           ~ 301 0
12 RAFGL 2135 C* 18 22 34.683 -27 06 29.38           C-rich 46 0
13 OH 20.1 -0.1 SFR 18 28 10.3918 -11 28 44.164           ~ 106 0
14 IRAS 18265-1517 out 18 29 24.8 -15 15 49           ~ 60 0
15 IRAS 18324-0737 mm 18 35 08.1 -07 35 04           ~ 16 0
16 [RJS2006] MSXDC G028.53-00.25 MM2 MoC 18 44 16.43 -03 59 22.3           ~ 12 0
17 GAL 029.96-00.02 Y*O 18 46 03.7 -02 39 21           ~ 328 1
18 [RJS2006] MSXDC G030.97-00.14 MM1 mm 18 48 21.6 -01 48 27           ~ 9 0
19 [RJS2006] MSXDC G031.97+00.07 MM1 mm 18 49 36.69 -00 45 49.2           ~ 21 0
20 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 455 0
21 SNR G035.2-01.8 SNR 19 01.6 +01 14           ~ 143 0
22 MSX6C G045.0711+00.1325 HII 19 13 22.0 +10 50 54           ~ 112 0
23 NGC 7538 OpC 23 13 37 +61 30.0           ~ 822 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2019AJ....158...18H and select 'bookmark this link' or equivalent in the popup menu


2020.01.29-22:05:04

© Université de Strasbourg/CNRS

    • Contact