The green bank Ammonia survey: Dense cores under pressure in Orion A

Helen Kirk, Rachel K. Friesen, Jaime E. Pineda, Erik Rosolowsky, Stella S.R. Offner, Christopher D. Matzner, Philip C. Myers, James Di Francesco, Paola Caselli, Felipe O. Alves, Ana Chacón-Tanarro, How Huan Chen, Michael Chun Yuan Chen, Jared Keown, Anna Punanova, Young Min Seo, Yancy Shirley, Adam Ginsburg, Christine Hall, Ayushi SinghHéctor G. Arce, Alyssa A. Goodman, Peter Martin, Elena Redaelli

Research output: Contribution to journalArticlepeer-review


We use gas temperature and velocity dispersion data from the Green Bank Ammonia Survey and core masses and sizes from the James Clerk Maxwell Telescope Gould Belt Survey to estimate the virial states of dense cores within the Orion A molecular cloud. Surprisingly, we find that almost none of the dense cores are sufficiently massive to be bound when considering only the balance between self-gravity and the thermal and non-thermal motions present in the dense gas. Including the additional pressure binding imposed by the weight of the ambient molecular cloud material and additional smaller pressure terms, however, suggests that most of the dense cores are pressure confined.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Aug 17 2017

ASJC Scopus subject areas

  • General

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