2019ApJ...876...30S

Query : 2019ApJ...876...30S

2019ApJ...876...30S - Astrophys. J., 876, 30-30 (2019/May-1)

Noncircular motions in the outer Perseus spiral arm.

SAKAI N., REID M.J., MENTEN K.M., BRUNTHALER A. and DAME T.M.

Abstract (from CDS):

We report measurements of parallax and proper motion for five 6.7 GHz methanol maser sources in the outer regions of the Perseus arm as part of the BeSSeL Survey of the Galaxy. By combining our results with previous astrometric results, we determine an average spiral arm pitch angle of 9.°2 ± 1.°5 and an arm width of 0.39 kpc for this spiral arm. For sources on the interior side of the Perseus arm, we find on average a radial inward motion in the Galaxy of 13.3 ± 5.4 km s–1 and counter to Galactic rotation of 6.2 ± 3.2 km s–1. These characteristics are consistent with models for spiral arm formation that involve gas entering an arm to be shocked and then to form stars. However, similar data for other spiral arms do not show similar characteristics.

Abstract Copyright: © 2019. The American Astronomical Society.

Journal keyword(s): Galaxy: kinematics and dynamics - ISM: individual objects: G094.60-1.79, G111.25-0.76, G136.84+1.16, G173.48+2.44, G188.94+0.88 - techniques: interferometric

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 ICRF J024457.6+622806 Sy1 02 44 57.6967097952 +62 28 06.517098084   12.15 12.19     ~ 310 2
2 NVSS J024858+621409 Rad 02 48 58.89198 +62 14 09.6783           ~ 6 1
3 NVSS J030642+624302 Rad 03 06 42.65955141 +62 43 02.0241670           ~ 32 1
4 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
5 ICRF J053012.5+372332 Rad 05 30 12.54929702 +37 23 32.6191478           ~ 12 0
6 GT 0535+331 Rad 05 39 09.67193472 +33 08 15.4916583           ~ 15 0
7 NVSS J054149+330131 Rad 05 41 49.43488808 +33 01 31.9043825           ~ 11 1
8 6C 054850+375340 QSO 05 52 17.93691536 +37 54 25.2824392           ~ 32 1
9 [IBR2011] J0607+2218 Rad 06 07 17.43600 +22 18 19.0800           ~ 2 0
10 [IBR2011] J0607+2129 Rad 06 07 59.56570 +21 29 43.7200           ~ 2 0
11 NVSS J060834+222943 Rad 06 08 34.31090 +22 29 42.9810           ~ 5 1
12 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
13 NAME Sgr Arm PoG 19 00 -30.0           ~ 710 1
14 NVSS J212346+545244 Rad 21 23 46.83487 +54 52 43.4884           ~ 6 1
15 NVSS J213701+510136 Rad 21 37 00.98616920 +51 01 36.1292444           ~ 35 1
16 [IBR2011] J2139+5540 Rad 21 39 32.6175 +55 40 31.771           ~ 3 0
17 NVSS J213953+530016 Rad 21 39 53.62438 +53 00 16.5993           ~ 7 1
18 NVSS J214507+514702 Rad 21 45 07.66657 +51 47 02.2430           ~ 8 1
19 NVSS J215014+510331 Rad 21 50 14.26619 +51 03 32.2638           ~ 8 1
20 NVSS J225425+620939 Rad 22 54 25.29271399 +62 09 38.7209531           ~ 18 1
21 NVSS J230126+570624 Rad 23 01 26.62669428 +57 06 25.5070217           ~ 17 1
22 NVSS J231418+581349 Rad 23 14 19.0832 +58 13 47.647           ~ 5 1
23 NVSS J233921+601012 Rad 23 39 21.12519661 +60 10 11.8495795           ~ 29 1
24 NAME Local Arm reg ~ ~           ~ 649 0

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