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Molecular Gas Kinematics and High-Mass Star Formation in the Spiral Arms of the Milky Way

Published online by Cambridge University Press:  22 February 2018

A. Luna ,
L. Carrasco ,
L. Ortega ,
L. Bronfman  and
O. Yam
A. Luna
Affiliation:
INAOE, Tonantzintla, Puebla, México
L. Carrasco
Affiliation:
INAOE, Tonantzintla, Puebla, México Instituto de Astronomía, UNAM, México
L. Ortega
Affiliation:
INAOE, Tonantzintla, Puebla, México
L. Bronfman
Affiliation:
Universidad de Chile. Santiago, Chile
O. Yam
Affiliation:
INAOE, Tonantzintla, Puebla, México

Abstract

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We study the kinematic of the molecular gas using observations of the rotational line 12CO(J=1→0), and also the star formation traced by Ultra-Compact HII regions in the IV galactic quadrant (270° ≤ l ≤ 360°). Our results show that there is a connection between 1) high-mass star formation in the spiral arms of the Milky Way, 2) molecular gas of high column density, and 3) the large-scale rigid-body-like motion of the gas. The large-scale rigid-body-like motions observed in the arms imply that there is less angular momentum to dissipate in the formation processes of stellar systems. We show a multiple stellar system under study, embedded in its parent molecular cloud in the Carina arm region.

Resumen

Resumen

Estudiamos la cinemática del gas molecular mediante la línea rotacional 12CO(J=1→0), así como la formación estelar que trazan las regiones HII ultracompactas en el IV cuadrante galáctico (270° ≤ l ≤ 360°). Mostramos que hay una conexión entre (1) la formación de estrellas masivas en los brazos espirales, (2) el gas molecular de alta densidad columnar y (3) los movimientos a gran escala observados en el gas. Estos últimos implican que hay menos momento angular a disipar en los procesos de formación estelar. Mostramos un sistema múltiple en estudio, que está embebido en su nube molecular en Carina.

Keywords

BinariesClose — GalaxyKinematics and Dynamics — ISMMolecules
Type
Observational Results for Very Young Binaries
Information
International Astronomical Union Colloquium , Volume 191: The Environment and Evolution of Double and Multiple Stars , August 2004 , pp. 143 - 144
Copyright
Copyright © Instituto de Astronomia – Mexico 2004

References

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