2019ApJ...874...94W

Query : 2019ApJ...874...94W

2019ApJ...874...94W - Astrophys. J., 874, 94-94 (2019/March-3)

Trigonometric parallaxes of star-forming regions beyond the tangent point of the Sagittarius spiral arm.

WU Y.W., REID M.J., SAKAI N., DAME T.M., MENTEN K.M., BRUNTHALER A., XU Y., LI J.J., HO B., ZHANG B., RYGL K.L.J. and ZHENG X.W.

Abstract (from CDS):

As part of the BeSSeL Survey, we report trigonometric parallaxes and proper motions of molecular maser sources associated with 13 distant high-mass star-forming regions in the Sagittarius spiral arm of the Milky Way. In particular, we obtain improved parallax distance estimates for three well-studied regions: 1.9–0.1+0.1kpc for M17, 5.3–0.9+1.3kpc for W51, and 7.9–0.7+0.9kpc for GAL 045.5+00.0. Peculiar motions for all but one source are less than 20 km s–1. We fit a log-periodic spiral to the locations and estimate an average pitch angle of 7.°2 ± 1.°9. We find that the section of the arm beyond the tangent point in the first quadrant of the Milky Way appears 15 pc below the IAU-defined Galactic plane.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrometry - Galaxy: kinematics and dynamics - Galaxy: structure - masers - stars: formation

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
2 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
3 IRAS 18134-1942 HII 18 16 22.1327 -19 41 27.219           ~ 72 0
4 GAL 014.33-00.64 HII 18 18 53.5 -16 47 39           ~ 75 0
5 HEC G014.63-00.57 DNe 18 19 13.6 -16 29 56           ~ 10 0
6 GAL 015.03-00.67 Mas 18 20 22.3 -16 11 18           ~ 15 0
7 NAME Aql Rift DNe 18 32 -01.0           ~ 355 1
8 GAL 034.4+00.23 HII 18 53 17.4 +01 24 55           ~ 93 1
9 [WWS2012] G035.03+00.35 cor 18 54 00.7975 +02 01 24.083           ~ 23 0
10 IRAS 18517+0437 SFR 18 54 13.8 +04 41 32           ~ 89 0
11 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 1034 2
12 GAL 035.2-00.74 cor 18 58 13.00 +01 40 36.0           ~ 176 0
13 NAME Sgr Arm PoG 19 00 -30.0           ~ 710 1
14 GAL 035.20-01.74 Y*O 19 01 46.49 +01 13 24.7           ~ 78 1
15 IRAS 19095+0930 cor 19 11 54.09216 +09 35 49.6896           ~ 115 0
16 IRAS 19110+1045 Y*O 19 13 22.0427 +10 50 53.336           ~ 132 0
17 GAL 045.5+00.0 HII 19 14 20.8 +11 09 04           ~ 141 0
18 CORNISH G045.4545+00.0591 HII 19 14 21.31 +11 09 11.7           ~ 157 1
19 GAL 048.99-00.29 HII 19 22 26.0 +14 07 08           ~ 13 0
20 GAL 049.2-00.3 HII 19 23 03 +14 16.2           ~ 28 0
21 IRAS 19211+1434 HII 19 23 26.5 +14 40 18           ~ 4 0
22 [WBN74] W 51 IRS 2 SFR 19 23 39.93 +14 31 09.4           ~ 321 0
23 NAME W 51 Main reg 19 23 43.8 +14 30 37           ~ 147 0
24 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1

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