2009ApJ...705.1548R

Query : 2009ApJ...705.1548R

2009ApJ...705.1548R - Astrophys. J., 705, 1548-1553 (2009/November-2)

A trigonometric parallax of Sgr B2.

REID M.J., MENTEN K.M., ZHENG X.W., BRUNTHALER A. and XU Y.

Abstract (from CDS):

We have measured the positions of H2 O masers in Sgr B2, a massive star-forming region in the Galactic center, relative to an extragalactic radio source with the Very Long Baseline Array. The positions measured at 12 epochs over a time span of one year yield the trigonometric parallax of Sgr B2 and hence a distance to the Galactic center of R0= 7.9+0.8–0.7 kpc. The proper motion of Sgr B2 relative to Sgr A* suggests that Sgr B2 is ~0.13 kpc nearer than the Galactic center, assuming a low-eccentricity Galactic orbit.

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Journal keyword(s): astrometry - Galaxy: fundamental parameters - Galaxy: halo - Galaxy: kinematics and dynamics - Galaxy: structure - stars: formation

CDS comments: Calibrator J1642+4938 is not in Simbad.

Simbad objects: 10

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Number of rows : 10
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12639 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17424 0
3 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2362 3
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14400 0
5 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4386 3
6 GCPS G000.538+0.261 Rad 17 45 52.48 -28 20 25.8           ~ 28 0
7 NAME Sgr B2N Mas 17 47 20.0000 -28 22 40.000           ~ 44 1
8 OH 000.66-00.03 Mas 17 47 20.12 -28 23 06.2           ~ 60 1
9 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2264 1
10 NAME Local Group GrG ~ ~           ~ 8385 0

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