2018RAA....18..146X

Query : 2018RAA....18..146X

2018RAA....18..146X - Research in Astron. and astroph., 18, 146-146 (2018/December-0)

The spiral structure of the Milky Way.

XU Y., HOU L.-G. and WU Y.-W.

Abstract (from CDS):

The morphology and kinematics of the spiral structure of the Milky Way are long-standing problems in astrophysics. In this review we firstly summarize various methods with different tracers used to solve this puzzle. The astrometry of Galactic sources is gradually alleviating this difficult situation caused mainly by large distance uncertainties, as we can currently obtain accurate parallaxes (a few µas) and proper motions (≃1 km s–1) by using Very Long Baseline Interferometry (VLBI). On the other hand, the Gaia mission is providing the largest, uniform sample of parallaxes for O-type stars in the entire Milky Way. Based upon the VLBI maser and Gaia O-star parallax measurements, nearby spiral structures of the Perseus, Local, Sagittarius and Scutum Arms are determined in unprecedented detail. Meanwhile, we estimate fundamental Galactic parameters of the distance to the Galactic center, R0 , to be 8.35 ± 0.18 kpc, and circular rotation speed at the Sun, Θ0, to be 240±10 km s–1. We found kinematic differences between O stars and interstellar masers: the O stars, on average, rotate faster, >8 km s -1 than maser-traced high-mass star forming regions.

Abstract Copyright: ∼

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

VizieR on-line data: <Available at CDS (J/other/RAA/18.146): table2.dat table3.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 25

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Number of rows : 25
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 V* V747 Cep SB* 00 01 46.8678793584 +67 30 25.102332180 11.6 11.38 10.07     O5.5V(n)((f)) 54 0
2 BD+66 1675 * 00 02 10.2887046096 +67 24 32.228861796 10.18 10.16 9.08     O7.5Vz 92 0
3 HD 225146 s*b 00 03 57.5025246576 +61 06 13.094034012 8.32 8.96 8.60     O9.7Iab 87 0
4 HD 225160 s*b 00 04 03.7944653736 +62 13 19.009200864 7.74 8.46 8.19     O8Iabf 119 0
5 LS I +66 4 * 00 04 16.1624265120 +66 20 56.863189140 12.54 12.11 10.79     O9 22 0
6 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7066 0
7 NAME Per Arm PoG 03 30 +45.0           ~ 1513 0
8 NAME Car Arm PoG 10 00 -60.0           ~ 439 1
9 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 306 0
10 NAME Crux Arm PoG 12 30 -60.0           ~ 88 0
11 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1179 0
12 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4330 4
13 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2914 2
14 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 514 1
15 NAME Nor Arm PoG 16 00 -50.0           ~ 430 0
16 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14415 0
17 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4390 3
18 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 209 0
19 NAME Sgr Arm PoG 19 00 -30.0           ~ 637 1
20 NAME Outer Arm PoG 21 48 +69.4           ~ 316 0
21 NAME Scutum Spiral Arm PoG ~ ~           ~ 351 0
22 NAME Galactic Bar reg ~ ~           ~ 1219 0
23 NAME Local Arm reg ~ ~           ~ 537 0
24 NAME Galactic Molecular Ring PoG ~ ~           ~ 42 0
25 NAME Centaurus Arm PoG ~ ~           ~ 82 0

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