2018ApJ...863...52V


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET15:07:06

2018ApJ...863...52V - Astrophys. J., 863, 52-52 (2018/August-2)

Offsets of masers with respect to the middle of the Perseus arm and the corotation radius in the Milky Way.

VALLEE J.P.

Abstract (from CDS):

The radial distance to the corotation radius Rcoro (where the angular speed of the gas and stars, Ωgas, in orbit around the Galactic center (GC) is equal to the angular speed of the spiral arm pattern, Ωsp) has often been predicted (at various places), but not measured with high precision. Here we test the locations of masers with respect to the Perseus arm (Table 1). Our analysis of the masers and H II regions near the Perseus arm (mostly located on the inner arm side, by about 0.4 ± 0.1 kpc from the cold CO mid-arm) shows that the corotation Rcoro must be >10.8 kpc from the GC (Figure 1). This implies that the angular rotation speed of the spiral pattern Ωsp< 21.3 km s–1 kpc–1. Another test in Galactic quadrant II shows that the radial velocity of the masers is generally more negative than that of the CO mid-arm (Figure 2), indicating a deceleration with respect to the CO mid-arm, by about 9 ± 3 km s–1. This implies that Ωsp < 20.7 km s–1 kpc–1, and thus Rcoro > 11.1 kpc. Finally, comparing our results with other published results (Table 2), we find a statistical mean corotation radius Rcoro predicted to be near 12 ± 1 kpc from the GC (beyond the Perseus arm; before the Cygnus arm), and a mean angular spiral pattern speed, Ωsp, predicted to be near 19 ± 2 km s–1 kpc–1.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: spiral - Galaxy: disk - Galaxy: kinematics and dynamics - Galaxy: structure - local interstellar matter - stars: distances

Simbad objects: 35

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Number of rows : 35

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IRAS 00420+5530 Y*? 00 44 57.31 +55 47 18.1           ~ 56 0
2 NGC 281 HII 00 52 25.1 +56 33 54           ~ 228 1
3 V* S Per s*r 02 22 51.7103845023 +58 35 11.454759954 13.22 10.55 7.90     M4.5-7Iae 352 0
4 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 935 2
5 IC 1805 OpC 02 32 42 +61 27.0   7.03 6.5     ~ 468 2
6 RAFGL 5077 HII 02 43 28.63 +62 57 08.6           ~ 61 0
7 NAME Per Arm PoG 03 30 +45.0           ~ 1213 0
8 MSX6C G160.1452+03.1559 HII 05 01 39.9 +47 07 20           ~ 3 0
9 IRAS 05137+3919 Cld 05 17 13.3 +39 22 14           ~ 56 0
10 IRAS 05168+3634 mul 05 20 16.2 +36 37 21           ~ 44 0
11 GLMP 111 HII 05 39 28.407 +24 56 29.82           ~ 8 0
12 [GMM2009] GGD 4 4 Y*O 05 40 24.2320296272 +23 50 54.736733046           ~ 12 0
13 SH 2-235 HII 05 41.1 +35 50           ~ 183 0
14 IRAS 06061+2151 SFR 06 09 07.8 +21 50 39           ~ 81 0
15 NGC 2175 OpC 06 09 39 +20 29.2   7.0 6.8     ~ 247 3
16 IC 2162 HII 06 13 04.1 +17 58 44           ~ 336 2
17 LBN 196.49-01.60 HII 06 14 38.40 +13 49 44.7           ~ 161 1
18 NAME Gal Anticenter reg 06 17 +22.5           ~ 701 0
19 IRAS 06501+0143 HII 06 52 46.18 +01 40 19.0           ~ 18 0
20 MSX6C G229.5711+00.1525 Mas 07 23 01.7718 -14 41 34.339           ~ 4 0
21 IRAS 07422-2001 HII 07 44 28.2367 -20 08 30.606           ~ 20 0
22 [HLB98] SEST 26 Mas 07 44 51.9676 -24 07 42.372           ~ 4 0
23 NAME Car Arm PoG 10 00 -60.0           ~ 371 1
24 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11189 0
25 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1673 2
26 NAME Sgr Arm PoG 19 00 -30.0           ~ 505 1
27 NAME Cyg Arm PoG 20 02 +40.0           ~ 138 0
28 MSX6C G100.3779-03.5784 Y*O 22 16 10.3651 +52 21 34.113           ~ 9 0
29 GAL 108.19+00.58 HII 22 49 29.2 +59 55 02           ~ 2 0
30 IRAS 22506+5944 HII 22 52 38.6 +60 00 56           ~ 52 0
31 IRAS 22555+6213 FIR 22 57 30.7 +62 30 04           ~ 8 0
32 MSX6C G108.4714-02.8176 Y*O 23 02 32.0813 +56 57 51.356           ~ 10 0
33 NGC 7538 OpC 23 13 37 +61 30.0           ~ 822 0
34 IRAS 23139+5939 MoC 23 16 10.03 +59 55 31.3           ~ 69 1
35 MSX6C G111.2348-01.2385 Y*O 23 17 20.7888 +59 28 46.970           ~ 8 0

    Equat.    Gal    SGal    Ecl

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2020.01.28-15:07:06

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