Evidence of Hubble flow-like motion of young stellar populations away from the Perseus arm. (arXiv:1812.11102v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Roman_Zuniga_C/0/1/0/all/0/1">Carlos Román-Zúñiga</a> (1,3), <a href="http://arxiv.org/find/astro-ph/1/au:+Roman_Lopes_A/0/1/0/all/0/1">Alexandre Roman-Lopes</a> (2,3), <a href="http://arxiv.org/find/astro-ph/1/au:+Tapia_M/0/1/0/all/0/1">Mauricio Tapia</a> (1,3), <a href="http://arxiv.org/find/astro-ph/1/au:+Hernandez_J/0/1/0/all/0/1">Jesús Hernández</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Ramirez_Preciado_V/0/1/0/all/0/1">Valeria Ramírez-Preciado</a> ((1) Instituto de Astronomía UNAM, Unidad Académica en Ensenada BC, Mexico, (2) Departamento de Física y Astronomía, Universidad La Serena Chile, (3) Programa de Estancias de Investigación (PREI), DGAPA-UNAM, Mexico)
In this letter we present evidence of coherent outward motion of a sample of
young stars ($t<$30 Myr) in the Perseus Arm, whose apparent origin is located
in the vicinity of the W3/W4/W5 complex. Using astrometric and photometric data
from the Gaia DR2 catalog of an 8$^circ$ 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 emerge 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
$15~{rm km~s}^{-1}~{rm kpc}^{-1}$.
In this letter we present evidence of coherent outward motion of a sample of
young stars ($t<$30 Myr) in the Perseus Arm, whose apparent origin is located
in the vicinity of the W3/W4/W5 complex. Using astrometric and photometric data
from the Gaia DR2 catalog of an 8$^circ$ 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 emerge 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
$15~{rm km~s}^{-1}~{rm kpc}^{-1}$.
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