2001A&A...377..999L


Query : 2001A&A...377..999L

2001A&A...377..999L - Astronomy and Astrophysics, volume 377, 999-1006 (2001/10-3)

A study of the kinematics of the H2O maser sources S269 and W75S from long-term monitoring.

LEKHT E.E., SILANT'EV N.A., MENDOZA-TORRES J.E., PASHCHENKO M.I. and KRASNOV V.V.

Abstract (from CDS):

It is shown that basic characteristics of turbulence can be derived from temporal behaviour, shape and radial-velocity drift of a spectral line. To perform this analysis, a 20-year monitoring of the H2O maser emission sources S269 and W75S was used. It is shown that the observed sinusoidal variation of the radial velocity of the main emission feature in S269 with a period of 26 years is not caused by Keplerian motion. Most likely, it results from rotation of a non-uniform turbulent vortex with a diameter of about 1 AU. Within the framework of this model, asymmetry of the emission feature at 20.1km/s and a jump of the linewidth, which took place after a strong flare in 1991, are explained. In W75S anticorrelation between fluxes of several emission features with close radial velocities is found. This anticorrelation is explained by competition of spatial modes of the emission for pumping in a partially saturated maser. It is shown that in the model of a maser in an expanding envelope (which is, most likely, the case in W75S) the emission features with anticorrelated fluxes form a spatially compact group.

Abstract Copyright:

Journal keyword(s): masers - shock waves - turbulence - star: formation

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 LDN 1287 DNe 00 36 47.5 +63 29 02           ~ 90 0
2 NGC 2071 RNe 05 47 10 +00 18.0           ~ 644 1
3 MMB G192.600-00.048 Y*O 06 12 54.0100 +17 59 23.200           ~ 395 0
4 IC 2162 HII 06 13 04.1 +17 58 44           ~ 358 2
5 LBN 196.49-01.60 HII 06 14 38.40 +13 49 44.7           ~ 165 1
6 W 49n HII 19 10 13.2 +09 06 12           ~ 468 3
7 NAME DR 21(OH) M Rad 20 39 01 +42 29.8           ~ 88 0
8 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 656 2
9 IRAS 22176+6303 Y*O 22 19 18.23 +63 18 47.5           ~ 594 0

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