The Green Bank Ammonia Survey: A Virial Analysis of Gould Belt Clouds in Data Release 1

Ronan Kerr, Helen Kirk, James Di Francesco, Jared Keown, Mike Chen, Erik Rosolowsky, Stella S.R. Offner, Rachel Friesen, Jaime E. Pineda, Yancy Shirley, Elena Redaelli, Paola Caselli, Anna Punanova, Youngmin Seo, Felipe Alves, Ana Chacón-Tanarro, Hope How-Huan Chen

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We perform a virial analysis of starless dense cores in three nearby star-forming regions: L1688 in Ophiuchus, NGC 1333 in Perseus, and B18 in Taurus. Our analysis takes advantage of comprehensive kinematic information for the dense gas in all of these regions made publicly available through the Green Bank Ammonia Survey Data Release 1, which is used to estimate internal support against collapse. We combine this information with ancillary data used to estimate other important properties of the cores, including continuum data from the James Clerk Maxwell Telescope Gould Belt Survey for core identification, core masses, and core sizes. Additionally, we used Planck- and Herschel-based column density maps for external cloud weight pressure and Five College Radio Astronomy Observatory 13 CO observations for external turbulent pressure. Our self-consistent analysis suggests that many dense cores in all three star-forming regions are not bound by gravity alone, but rather require additional pressure confinement to remain bound. Unlike a recent, similar study in Orion A, we find that turbulent pressure represents a significant portion of the external pressure budget. Our broad conclusion emphasizing the importance of pressure confinement in dense core evolution, however, agrees with earlier work.

Original languageEnglish (US)
Article number147
JournalAstrophysical Journal
Volume874
Issue number2
DOIs
StatePublished - Apr 1 2019

Keywords

  • ISM: kinematics and dynamics
  • stars: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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