The Corona Australis star formation complex is accelerating away from the Galactic plane

L. Posch, N. Miret-Roig, J. Alves, S. Ratzenböck, J. Großschedl, S. Meingast, C. Zucker, A. Burkert

Publications: Contribution to journalArticlePeer Reviewed

Abstract

We study the kinematics of the recently discovered Corona Australis (CrA) chain of clusters by examining the 3D space motion of its young stars using Gaia DR3 and APOGEE-2 data. While we observe linear expansion between the clusters in the Cartesian XY directions, the expansion along Z exhibits a curved pattern. To our knowledge, this is the first time such a nonlinear velocity-position relation has been observed for stellar clusters. We propose a scenario to explain our findings, in which the observed gradient is caused by stellar feedback, accelerating the gas away from the Galactic plane. A traceback analysis confirms that the CrA star formation complex was located near the central clusters of the Scorpius Centaurus (Sco-Cen) OB association 10-15 Myr ago. It contains massive stars and thus offers a natural source of feedback. Based on the velocity of the youngest unbound CrA cluster, we estimate that a median number of about two supernovae would have been sufficient to inject the present-day kinetic energy of the CrA molecular cloud. This number agrees with that of recent studies. The head-tail morphology of the CrA molecular cloud further supports the proposed feedback scenario, in which a feedback force pushed the primordial cloud from the Galactic north, leading to the current separation of 100 pc from the center of Sco-Cen. The formation of spatially and temporally well-defined star formation patterns, such as the CrA chain of clusters, is likely a common process in massive star-forming regions.
Original languageEnglish
Article numberL10
Number of pages11
JournalAstronomy & Astrophysics
Volume679
DOIs
Publication statusPublished - Nov 2023

Austrian Fields of Science 2012

  • 103003 Astronomy
  • 103004 Astrophysics

Keywords

  • Astrophysics - Astrophysics of Galaxies
  • Stars: kinematics and dynamics
  • ISM: kinematics and dynamics
  • Open clusters and associations: individual: Corona Australis

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