2001ApJ...550L..81W


Query : 2001ApJ...550L..81W

2001ApJ...550L..81W - Astrophys. J., 550, L81-L85 (2001/March-3)

Hot cores in W49N and the timescale for hot core evolution.

WILNER D.J., DE PREE C.G., WELCH W.J. and GOSS W.M.

Abstract (from CDS):

We present subarcsecond resolution observations of the star-forming region W49N made with the Berkeley-Illinois-Maryland Association array at 1.4 mm wavelength in the continuum and CH3CN J=12-11 lines. The continuum image, at a resolution of 0".18 (2000 AU), shows many of the previously identified ultracompact H II regions and at least one new source whose steep spectrum to short wavelengths indicates dust emission. This compact dust concentration also shows the strongest CH3CN emission in the region. Additional peaks of CH3CN emission likely mark hot cores produced by other deeply embedded young massive stars that may be precursors to O-type stars like those that power the ultracompact H II regions. The number ratio of hot cores to ultracompact H II regions found in W49N provides a measure of the relative timescales of these early evolutionary phases. Although the samples are small, the source counts suggest that the hot core lifetime is most likely shorter than, but comparable to, the ultracompact H II region lifetime.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - ISM: Individual: Alphanumeric: W49N - Stars: Formation

Nomenclature: Fig.1: [DJW84] W49 AN (No. K2) added. Fig.2, Table 2: [WDW2001] MCN a (Nos a-f).

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Turner-Welch Object Y*O 02 27 04.717 +61 52 24.73           ~ 31 0
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2167 1
3 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5584 1
4 4C 09.57 BLL 17 51 32.8186120872 +09 39 00.728629416   17.46 16.78 15.57   ~ 884 1
5 PKS 1750+093 Rad 17 53 02.4008211000 +09 19 59.319539976           ~ 8 1
6 [DJW84] W49 A2 Rad 19 10 12 +09 06.2           ~ 8 0
7 [DJW84] W49 A1 Rad 19 10 12 +09 06.2           ~ 7 0
8 [DJW84] W49 B2 Rad 19 10 13.143 +09 06 12.52           ~ 11 0
9 [DJW84] W49 B HII 19 10 13.19 +09 06 12.8           ~ 20 0
10 [DJW84] W49 C HII 19 10 13.19 +09 06 18.8           ~ 19 0
11 W 49n HII 19 10 13.2 +09 06 12           ~ 440 3
12 [DJW84] W49 D HII 19 10 13.26 +09 06 11.4           ~ 18 0
13 [DJW84] W49 B1 Rad 19 10 13.26 +09 06 15.0           ~ 14 0
14 [DJW84] W49 G2a Rad 19 10 13.417 +09 06 13.14           ~ 14 0
15 [DJW84] W49 G2b Rad 19 10 13.450 +09 06 12.98           ~ 11 0
16 [DJW84] W49 G2c Rad 19 10 13.48 +09 06 13.1           ~ 9 0
17 [DJW84] W49 G HII 19 10 13.57 +09 06 12.9           ~ 26 0
18 [DJW84] W49 K2 Rad 19 10 14.135 +09 06 24.93           ~ 2 0
19 W 49 SFR 19 10 20 +09 07.7           ~ 541 1
20 4C 06.69 QSO 21 48 05.4586454304 +06 57 38.602799388   16.85 16.47 15.06   ~ 629 1

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2022.08.13-07:40:27

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