2015ApJ...810..147L


Query : 2015ApJ...810..147L

2015ApJ...810..147L - Astrophys. J., 810, 147 (2015/September-2)

Extremely energetic outflow and decelerated expansion in W49N.

LIU T., KIM K.-T., WU Y., LI D., LEE C.-W., DE PREE C.G., QIN S.-L., WANG K., TATEMATSU K., ZHANG Q., MARDONES D., LIU S.-Y. and CHO S.-H.

Abstract (from CDS):

W49N is a mini-starburst in the Milky Way and is thus an ideal laboratory for high-mass star formation studies. Due to its large distance (11.1–0.7+0.9 kpc), the kinematics inside and between the dense molecular clumps in W49N are far from well-understood. The Submillimeter Array observations resolved the continuum emission into two clumps. The molecular line observation of SO2(284.24-283.25) suggests that the two clumps have a velocity difference of ∼7 km/s. The eastern clump is very close to two radio sources ''G1'' and ''G2,'' and the western clump coincides with a radio source ''B.'' The HCN (3-2) line reveals an extremely energetic outflow, which is among the most energetic molecular outflows in the Milky Way. This is the first report of high-velocity molecular outflow detection in W49N. The outflow jet might be in precession, which could account for the distribution, velocity, and rotation of water maser spots. Three absorption systems are identified in HCO+ (3-2) spectra. The absorption features are blueshifted with respect to the emission of SO2(284.24-283.25) lines, indicating that a cold layer is expanding in front of the warm gas. Further analysis indicates that the expansion is decelerated from the geometric expansion centers.

Abstract Copyright:

Journal keyword(s): ISM: jets and outflows - ISM: kinematics and dynamics - stars: formation

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 436 3
2 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 894 1
3 [GRM93] G09.61+0.20 F Rad 18 06 14.89 -20 31 38.9           ~ 28 1
4 W 49n HII 19 10 13.2 +09 06 12           ~ 447 3
5 [DJW84] W49 G1 HII 19 10 13.42 +09 06 12.8           ~ 21 0
6 [DJW84] W49 G2 HII 19 10 13.47 +09 06 13.2           ~ 18 0
7 [DJW84] W49 G3 Rad 19 10 13.55 +09 06 12.1           ~ 13 0
8 [DJW84] W49 G HII 19 10 13.57 +09 06 12.9           ~ 26 0
9 [DJW84] W49 G4 Rad 19 10 13.57 +09 06 13.5           ~ 13 0
10 [DJW84] W49 H HII 19 10 13.64 +09 06 17.2           ~ 12 0
11 [DJW84] W49 G5 Rad 19 10 13.66 +09 06 12.4           ~ 13 0
12 W 49 SFR 19 10 20 +09 07.7           ~ 551 1
13 NAME W 49A South HII 19 10 21.6 +09 05 03           ~ 53 2
14 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 421 0
15 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 548 0
16 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2719 2
17 NGC 7538S Y*O 23 13 44.8 +61 26 51           ~ 84 1
18 NAME W 49SW IR ~ ~           ~ 10 1

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2022.11.30-11:40:04

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