2024AJ....167..267B

Query : 2024AJ....167..267B

2024AJ....167..267B - Astron. J., 167, 267 (2024/June-0)

On the Structure of the Sagittarius Spiral Arm in the Inner Milky Way.

BIAN S.B., WU Y.W., XU Y., REID M.J., LI J.J., ZHANG B., MENTEN K.M., MOSCADELLI L. and BRUNTHALER A.

Abstract (from CDS):

We report measurements of trigonometric parallax and proper motion for two 6.7 GHz methanol and two 22 GHz water masers located in the far portion of the Sagittarius spiral arm as part of the BeSSeL Survey. Distances for these sources are estimated from parallax measurements combined with three-dimensional kinematic distances. The distances of G033.64-00.22, G035.57-00.03, G041.15-00.20, and G043.89-00.78 are 9.9 ± 0.5, 10.2 ± 0.6, 7.6 ± 0.5, and 7.5 ± 0.3 kpc, respectively. Based on these measurements, we suggest that the Sagittarius arm segment beyond about 8 kpc from the Sun in the first Galactic quadrant should be adjusted radially outward relative to previous models. This supports the suggestion of Xu et al. that the Sagittarius and Perseus spiral arms might merge in the first quadrant before spiraling inward to the far end of the Galactic bar.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Interstellar masers - Trigonometric parallax - Star forming regions - Milky Way Galaxy

Simbad objects: 37

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Number of rows : 37
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 SGP reg 00 51 26.275 -27 07 41.70           ~ 606 0
2 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
3 NAME Nor Arm PoG 16 00 -50.0           ~ 485 0
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
5 GAL 019.61-00.23 HII 18 27 38.0 -11 56 42           ~ 162 0
6 GAL 019.60-00.23 HII 18 27 38.11 -11 56 39.5           ~ 16 0
7 Caswell CH3OH 020.08-00.14 Mas 18 28 10.28 -11 28 48.4           ~ 8 0
8 NVSS J184821+013826 Rad 18 48 21.81035 +01 38 26.6322           ~ 8 1
9 Caswell CH3OH 032.74-00.08 Mas 18 51 21.8 -00 12 13           ~ 14 0
10 Caswell OH 032.74-00.08 Mas 18 51 21.8624 -00 12 06.220           ~ 15 0
11 [HMW2016] G033.641-00.227 Mas 18 53 32.5630 +00 31 39.100           ~ 8 0
12 NVSS J185535+025119 Rad 18 55 35.43648898 +02 51 19.5650288           ~ 22 1
13 OH 035.6-00.0 Mas 18 56 21 +02 19.9           ~ 3 0
14 AGAL G035.579-00.031 cor 18 56 22.6865 +02 20 19.057           ~ 36 0
15 [SKH2002] 35.79-0.17 Mas 18 57 16.1 +02 27 44           ~ 4 0
16 [HMW2016] G035.792-00.174 Mas 18 57 16.8905 +02 27 58.007           ~ 6 0
17 NVSS J185751-004817 Rad 18 57 51.35860 -00 48 21.9496           ~ 15 1
18 NAME Sgr Arm PoG 19 00 -30.0           ~ 710 1
19 [HMW2016] G037.479-00.104 Mas 19 00 07.1430 +03 59 52.975           ~ 10 0
20 [HMW2016] G038.037-00.300 Mas 19 01 50.4676 +04 24 18.900           ~ 9 0
21 NVSS J190521+065210 Rad 19 05 21.21022 +06 52 10.7804           ~ 9 1
22 NVSS J190539+095208 Rad 19 05 39.89897022 +09 52 08.4074677           ~ 24 1
23 [RMB2014] G041.15-00.20 Mas 19 07 14.3676 +07 13 18.025           ~ 3 0
24 [HMW2016] G041.226-00.197 Mas 19 07 21.3772 +07 17 08.115           ~ 7 0
25 [IBR2011] J1907+0907 Rad 19 07 41.96336 +09 07 12.3968           ~ 4 0
26 [HMW2016] G043.038-00.452 Mas 19 11 38.9819 +08 46 30.665           ~ 6 0
27 IRAS 19110+1045 Y*O 19 13 22.0427 +10 50 53.336           ~ 132 0
28 [HMW2016] G045.071+00.132 Mas 19 13 22.120 +10 50 52.82           ~ 3 0
29 NVSS J191324+093246 Rad 19 13 24.0254 +09 32 45.379           ~ 9 1
30 Caswell CH3OH 045.49+00.13 Mas 19 14 11.3553 +11 13 06.370           ~ 13 0
31 [ARM2000] G045.455+00.060 Mas 19 14 21.2658 +11 09 15.872           ~ 8 0
32 [HMW2016] G043.890-00.784 Mas 19 14 26.388 +09 22 36.74           ~ 3 0
33 [RMB2014] G043.89-00.78 Mas 19 14 26.3906 +09 22 36.568           ~ 4 0
34 [WWS2012] G045.80-00.36 cor 19 16 30.9393 +11 16 17.804           ~ 17 0
35 SSTGLMC G045.8040-00.3560 Y*? 19 16 31.0795 +11 16 11.985           ~ 6 0
36 NVSS J192218+084157 Rad 19 22 18.63366368 +08 41 57.3758311           ~ 24 1
37 NAME Galactic Bar reg ~ ~           ~ 1458 0

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