2019ApJ...871L..12R


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.16CET23:41:51

2019ApJ...871L..12R - Astrophys. J., 871, L12-L12 (2019/January-3)

Evidence of Hubble flow-like motion of young stellar populations away from the Perseus Arm.

ROMAN-ZUNIGA C.G., ROMAN-LOPES A., TAPIA M., HERNANDEZ J. and RAMIREZ-PRECIADO V.

Abstract (from CDS):

In this Letter we present evidence of the coherent outward motion of a sample of young stars (t < 30 Myr) in the Perseus Arm, whose apparent origin is located in the vicinity of the W3/W4/W5 complex. Using astrometric and photometric data from the Gaia Data Release 2 catalog of an 8* radius field centered near W4, we selected a sample of young intermediate- to high-mass star candidates. The sample is limited to sources with parallax uncertainties below 20% and Bayesian distance estimates within 1800 and 3100 pc. The selection includes embedded stellar populations as well as young open clusters. Projected velocities derived from perspective-corrected proper motions clearly suggest that the young star population emerged from the Perseus Arm, with a possible convergence zone near W3/W4/W5 region, tracing a front that expands away at a rate of about 15kms–1kpc–1.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: kinematics and dynamics - open clusters and associations: general - stars: kinematics and dynamics - stars: massive

Simbad objects: 18

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Number of rows : 18

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 NGC 654 OpC 01 44 00 +61 53.1   7.34 6.5     ~ 178 0
2 Ass Cas OB 8 As* 01 44 +61.1           ~ 42 0
3 NGC 663 OpC 01 46 09 +61 14.1   7.78 7.1     ~ 233 0
4 SNR G132.6+01.5 SNR 02 17 40 +62 45.0           ~ 153 0
5 NGC 869 OpC 02 19 00 +57 07.7           ~ 419 0
6 Ass Per OB 1 As* 02 21 +57.6           ~ 159 1
7 NGC 884 OpC 02 22 23 +57 07.5           ~ 438 0
8 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 943 3
9 NAME Heart Nebula HII 02 32.7 +61 27           ~ 272 1
10 IC 1805 OpC 02 32 42 +61 27.0   7.03 6.5     ~ 466 2
11 NGC 957 OpC 02 33 21 +57 33.6   8.34 7.6     ~ 85 0
12 IC 1848 OpC 02 51 06 +60 24.6   6.87 6.5     ~ 430 2
13 NAME Per Arm PoG 03 30 +45.0           ~ 1197 0
14 NAME Per Region reg 03 37 00.0 +31 15 00           ~ 222 0
15 M 42 HII 05 35 17.3 -05 23 28           ~ 3658 0
16 Ass Vel OB 2 As* 08 09 22.478 -47 21 03.46           ~ 200 0
17 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1080 1
18 NAME Local Arm reg ~ ~           ~ 346 0

    Equat.    Gal    SGal    Ecl

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2019.11.16-23:41:51

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