2013ApJ...769...15X

Query : 2013ApJ...769...15X

2013ApJ...769...15X - Astrophys. J., 769, 15 (2013/May-3)

On the nature of the Local Spiral Arm of the Milky Way.

XU Y., LI J.J., REID M.J., MENTEN K.M., ZHENG X.W., BRUNTHALER A., MOSCADELLI L., DAME T.M. and ZHANG B.

Abstract (from CDS):

Trigonometric parallax measurements of nine water masers associated with the Local Arm of the Milky Way were carried out as part of the BeSSeL Survey using the Very Long Baseline Array. When combined with 21 other parallax measurements from the literature, the data allow us to study the distribution and three-dimensional motions of star forming regions in the spiral arm over the entire northern sky. Our results suggest that the Local Arm does not have the large pitch angle characteristic of a short spur. Instead its active star formation, overall length (>5 kpc), and shallow pitch angle (∼10°) suggest that it is more like the adjacent Perseus and Sagittarius Arms; perhaps it is a branch of one of these arms. Contrary to previous results, we find the Local Arm to be closer to the Perseus than to the Sagittarius Arm, suggesting that a branching from the former may be more likely. An average peculiar motion of near zero toward both the Galactic center and north Galactic pole, and counter rotation of ∼5 km/s were observed, indicating that the Local Arm has similar kinematic properties as found for other major spiral arms.

Abstract Copyright: ∼

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

Simbad objects: 63

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Number of rows : 63
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 LDN 1287 DNe 00 36 47.5 +63 29 02           ~ 91 0
2 [SDA2014] West4 Y*O 03 25 38.83 +30 44 06.2           ~ 256 1
3 IRAS F03226+3033 Y*O 03 25 38.83 +30 44 06.2           ~ 335 0
4 V* V512 Per Or* 03 29 03.7578170808 +31 16 03.947525688           M3.5 386 0
5 NAME Per Arm PoG 03 30 +45.0           ~ 1513 0
6 M 42 HII 05 35 17 -05 23.4           ~ 4075 0
7 V* VY CMa s*r 07 22 58.3261352189 -25 46 03.194390594 12.01 10.068 8.691 7.938   M5Iae 1103 0
8 RCW 7 HII 07 32 09.59 -16 58 12.3           ~ 55 0
9 IRAS 07299-1651 Y*O 07 32 09.7800 -16 58 12.800           ~ 79 0
10 NAME Car Arm PoG 10 00 -60.0           ~ 439 1
11 Haro 1-6 Or* 16 26 03.0276684144 -24 23 36.188140848   14.15 14.01 12.38 10.80 K0 217 2
12 GSS 35 TT* 16 26 34.1761719864 -24 23 28.283473860     16.53 14.75 12.51 B3 236 1
13 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1252 1
14 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14414 0
15 [EC92] 95 Y*O 18 29 57.893 +01 12 46.25           K1.0 73 3
16 NAME Sgr Arm PoG 19 00 -30.0           ~ 637 1
17 MSX6C G059.7831+00.0648 Y*O 19 43 11.2464 +23 44 03.270           ~ 150 0
18 IRAS 19410+2336 SFR 19 43 11.5 +23 44 06           ~ 155 0
19 NVSS J200330+303430 Rad 20 03 30.24405437 +30 34 30.7886003           ~ 24 1
20 QSO B2005+40 QSO 20 07 44.9449261536 +40 29 48.603352020   18.5 19.00 20.3   ~ 301 1
21 [KCW94] 069.540-00.975 HII 20 10 09.0 +31 31 35           ~ 168 1
22 IRAS 20081+3122 Y*O 20 10 09.036 +31 31 34.14           ~ 171 0
23 Onsala 1 cor 20 10 09.2036 +31 31 36.090           ~ 188 0
24 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 440 0
25 QSO J2015+371 BLL 20 15 28.72978661 +37 10 59.5147372     21.82 21.4   ~ 299 2
26 GAL 075.76+00.34 Mas 20 21 41.0860 +37 25 29.280           ~ 22 1
27 IRAS 20198+3716 mul 20 21 41.1 +37 25 54           ~ 16 1
28 NVSS J202141+372552 Rad 20 21 41.60 +37 25 52.1           ~ 16 2
29 OH 075.8+00.3 HII 20 21 43.8 +37 26 39           ~ 94 2
30 GAL 075.78+00.34 cor 20 21 44.00 +37 26 38.0           ~ 126 1
31 IRAS 20231+3440 HII 20 25 07.2435401472 +34 50 05.260444728           ~ 20 1
32 QSO B2023+336 BLL 20 25 10.84210426 +33 43 00.2143556       0   ~ 172 1
33 WSRTGP 2025+3712 HII 20 27 26.4 +37 22 48           ~ 48 0
34 NAME SH 2-106 IR Y*O 20 27 26.502 +37 22 42.03           ~ 163 1
35 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 440 1
36 RAFGL 2591 Y*O 20 29 24.8230 +40 11 19.590           ~ 622 0
37 NAME Cyg X BL? 20 30 04.7973633 +40 51 36.002197           ~ 845 1
38 NAME IRAS 20286+4105 Cluster OpC 20 30 28.0 +41 15 48           ~ 7 0
39 IRAS 20286+4105 HII 20 30 29.9 +41 15 51           ~ 54 1
40 IRAS 20290+4052 HII 20 30 50.660 +41 02 27.60           ~ 29 0
41 18P 73 Rad 20 36 55.9 +41 36 29           ~ 46 0
42 LDN 870 DNe 20 37.0 +35 11           ~ 7 0
43 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 399 1
44 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1054 0
45 NML Cyg s*r 20 46 25.5392819088 +40 06 59.464289232           M7/8 508 0
46 2MASS J20564271+4940068 BLL 20 56 42.7402786032 +49 40 06.604076316           ~ 70 1
47 [IBR2011] J2059+4851 Rad 20 59 57.87249 +48 51 12.7002           ~ 2 0
48 IRAS 21007+4951 mul 21 02 22.9 +50 03 06           ~ 26 0
49 LDN 998 DNe 21 04.1 +51 12           ~ 5 0
50 [HLB98] Onsala 150 Mas 21 09 21.7320 +52 22 37.080           ~ 5 0
51 IRAS 21078+5209 IR 21 09 26.0 +52 21 52           ~ 6 0
52 IRAS 21078+5211 HII 21 09 31.03 +52 24 16.1           ~ 56 0
53 [IBR2011] J2114+4953 Rad 21 14 15.03646 +49 53 40.9540           ~ 3 0
54 NVSS J211756+543133 Rad 21 17 56.48452352 +54 31 32.5020386           ~ 14 1
55 NGC 7129 OpC 21 42 58 +66 06.8     11.5     ~ 260 0
56 [TCT2004] VLA 3B cm 21 43 06.462 +66 06 55.22           ~ 8 1
57 EM* LkHA 234 Ae* 21 43 06.8218113480 +66 06 54.202272804 13.65 13.61 12.73 11.98 11.20 B5Ve 286 0
58 ICRF J220312.6+675047 Bz? 22 03 12.62269154 +67 50 47.6737621           ~ 15 1
59 LDN 1204A HII 22 21 26.68 +63 51 38.2           ~ 110 0
60 LDN 1206 DNe 22 28 52.2 +64 13 43           ~ 66 0
61 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 739 2
62 NAME Local Arm reg ~ ~           ~ 537 0
63 NAME Ori Arm PoG ~ ~           ~ 201 0

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