2014ApJ...793...72S


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.11CET22:15:38

2014ApJ...793...72S - Astrophys. J., 793, 72 (2014/October-1)

Trigonometric parallaxes of star forming regions in the Scutum spiral arm.

SATO M., WU Y.W., IMMER K., ZHANG B., SANNA A., REID M.J., DAME T.M., BRUNTHALER A. and MENTEN K.M.

Abstract (from CDS):

We report measurements of trigonometric parallaxes for six high-mass star-forming regions in the Scutum spiral arm of the Milky Way as part of the BeSSeL Survey. Combining our measurements with 10 previous measurements from the BeSSeL Survey yields a total sample of 16 sources in the Scutum arm with trigonometric parallaxes in the Galactic longitude range from 5° to 32°. Assuming a logarithmic spiral model, we estimate a pitch angle of 19.°8±3.°1 for the Scutum arm, which is larger than pitch angles reported for other spiral arms. The high pitch angle of the arm may be due to the arm's proximity to the Galactic bar. The Scutum arm sources show an average peculiar motion of 4 km/s slower than the Galactic rotation and 8 km/s toward the Galactic center. While the direction of this non-circular motion has the same sign as determined for sources in other spiral arms, the motion toward the Galactic center is greater for the Scutum arm sources.

Abstract Copyright:

Journal keyword(s): astrometry - Galaxy: kinematics and dynamics - Galaxy: structure - masers - parallaxes - stars: formation

Simbad objects: 27

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Number of rows : 27

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 NAME Per Arm PoG 03 30 +45.0           ~ 1194 0
2 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 263 0
3 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 980 0
4 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11032 0
5 [IBR2011] J1751-1950 Rad 17 51 41.34380 -19 50 47.5060           ~ 10 0
6 PMN J1755-2232 Rad 17 55 26.28477177 -22 32 10.6166169           ~ 23 0
7 GAL 005.88-00.41 HII 18 00 30.388 -24 04 00.20           ~ 290 0
8 SNR G006.4-00.1 SNR 18 01 22.7 -23 17 20           ~ 631 1
9 PMN J1807-2506 cm 18 07 40.68769551 -25 06 25.9440556           ~ 7 0
10 [IBR2011] J1808-1822 Rad 18 08 55.51552 -18 22 53.3897           ~ 7 0
11 PMN J1809-1519 Rad 18 09 10.20936 -15 20 09.6991           ~ 9 1
12 [CBH2011b] G11.92-0.61 MM1 mm 18 13 58.103 -18 54 20.19           ~ 20 0
13 [CBH2011b] G11.92-0.61 MM3 mm 18 13 58.21 -18 54 16.2           ~ 6 0
14 SNR G012.8-00.2 SFR 18 14 14.0 -17 55 50           ~ 213 0
15 [IBR2011] J1825-1551 Rad 18 25 11.7218 -15 51 34.407           ~ 2 0
16 PMN J1825-1718 Rad 18 25 36.53244 -17 18 49.8521           ~ 29 1
17 PMN J1833-0323 Rad 18 33 23.90553 -03 23 31.4656           ~ 6 1
18 [IBR2011] J1837-0653 Rad 18 37 58.0334 -06 53 31.247           ~ 2 0
19 PMN J1846-0651 Rad 18 46 06.30024 -06 51 27.7472           ~ 9 1
20 NVSS J185751-004817 Rad 18 57 51.35860 -00 48 21.9496           ~ 9 1
21 NAME Sgr Arm PoG 19 00 -30.0           ~ 496 1
22 [IBR2011] J1904+0110 Rad 19 04 26.39738 +01 10 36.7078           ~ 4 0
23 ICRF J190711.9+012708 QSO 19 07 11.9988607394 +01 27 09.018074966           ~ 29 1
24 NAME Outer Arm PoG 21 48 +69.4           ~ 205 0
25 NAME Scutum Spiral Arm PoG ~ ~           ~ 256 0
26 NAME Galactic Bar reg ~ ~           ~ 823 0
27 NAME Galactic Molecular Ring PoG ~ ~           ~ 38 0

    Equat.    Gal    SGal    Ecl

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2019.11.11-22:15:38

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