2004A&A...419..191C -
Astronomy and Astrophysics, volume 419, 191-201 (2004/5-3)
The connection between W31, SGR 1806-20, and LBV 1806-20: Distance, extinction, and structure.
CORBEL S. and EIKENBERRY S.S.
Abstract (from CDS):
We present new millimeter and infrared spectroscopic observations towards the radio nebula G10.0-0.3, which is powered by the wind of the Luminous Blue Variable star LBV 1806-20 also closely associated with the soft gamma-ray repeater SGR 1806-20, and believed to be located in the giant Galactic HII complex W31. Based on observations of CO emission lines and NH
3 absorption features from molecular clouds along the line of sight to G10.0-0.3, as well as the radial velocity and optical extinction of the star powering the nebula, we determine its distance to be 15.1
+1.8–1.3kpc in agreement with Corbel et al. (
1997ApJ...478..624C). In addition, this strengthens the association of SGR 1806-20 with a massive molecular cloud at the same distance. All soft gamma-ray repeaters with precise location are now found to be associated with a site of massive star formation or molecular cloud. We also show that W31 consists of at least two distinct components along the line of sight. We suggest that G10.2-0.3 and G10.6-0.4 are located on the -30km/s spiral arm at a distance from the Sun of 4.5±0.6kpc and that G10.3-0.1 may be associated with a massive molecular cloud at the same distance as the LBV star, i.e. 15.1
+1.8–1.3kpc, implying that W31 could be decomposed into two components along the line of sight.
Abstract Copyright:
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Journal keyword(s):
stars: neutron - stars: individual: SGR 1806-20 - stars: individual: LBV 1806-20 - ISM: individual: W31 - Galaxy: structure - Galaxy: kinematics and dynamics
Nomenclature:
Table 1: [CWD97] MC+VVA N=3+2 added.
Simbad objects:
23
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