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

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 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 \textit{Planck} and \textit{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.

35 pages, 8 tables, and 14 figures consisting of 16 .pdf files. Accepted for publication in the Astrophysical Journal

References in corpus (30)

• Cold Dark Clouds: The Initial Conditions for Star Formation
• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Structural Analysis of Molecular Clouds: Dendrograms
• The Critical Density and the Effective Excitation Density of Commonly Observed Molecular Dense Gas Tracers
• The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST)
• CO Isotopologues in the Perseus Molecular Cloud Complex: the X-Factor and Regional Variations
• The COMPLETE Survey of Star-Forming Regions: Phase I Data
• The Nature of the Dense Core Population in the Pipe Nebula: Thermal Cores Under Pressure
• The Large and Small Scale Structures of Dust in the Star-Forming Perseus Molecular Cloud
• Herschel-Planck dust optical-depth and column-density maps: I. Method description and results for Orion
• The Gould's Belt Distances Survey (GOBELINS) I. Trigonometric parallax distances and depth of the Ophiuchus complex
• The James Clerk Maxwell Telescope Legacy Survey of Nearby Star-forming Regions in the Gould Belt
• Depletion and low gas temperature in the L183 prestellar core : the N2H+ - N2D+ tool
• Dynamics of Dense Cores in the Perseus Molecular Cloud
• The JCMT BISTRO Survey: The magnetic field strength in the Orion A filament
• The Perils of Clumpfind: The Mass Spectrum of Sub-structures in Molecular Clouds
• Revealing the physical properties of molecular gas in Orion with a large scale survey in J=2-1 lines of 12CO, 13CO and C18O
• On the Distance to the Ophiuchus Star-Forming Region
• The Green Bank Ammonia Survey: Dense Cores Under Pressure in Orion A
• A Large Scale Survey of NGC1333
• How do stars gain their mass? A JCMT/SCUBA-2 Transient Survey of Protostars in Nearby Star Forming Regions
• The dust temperatures of the prestellar cores in the rho Oph main cloud and in other star forming regions: consequences for the core mass function
• Revealing H2D+ depletion and compact structure in starless and protostellar cores with ALMA
• An Ammonia Spectral Map of the L1495-B218 Filaments in the Taurus Molecular Cloud : I. Physical Properties of Filaments and Dense cores
• The fragmentation and stability of hierarchical structure in Serpens South
• Dust opacity variations in the pre-stellar core L1544
• The JCMT Gould Belt Survey: First results from SCUBA-2 observations of the Cepheus Flare Region
• The Green Bank Ammonia Survey: Observations of Hierarchical Dense Gas Structures in Cepheus-L1251
• Astrochemical Correlations in Molecular Clouds
• The Green Bank Ammonia Survey: Unveiling the Dynamics of the Barnard 59 star-forming Clump

Cited by in corpus (18)

• Stars with Photometrically Young Gaia Luminosities Around the Solar System (SPYGLASS) I: Mapping Young Stellar Structures and their Star Formation Histories
• From diffuse gas to dense molecular cloud cores
• Turbulence, Coherence and Collapse: Three Phases for Core Evolution
• Are massive dense clumps truly sub-virial? A new analysis using Gould Belt ammonia data
• SPYGLASS. II. The Multi-Generational and Multi-Origin Star Formation History of Cepheus Far North
• Relative Alignment between Dense Molecular Cores and Ambient Magnetic Field: The Synergy of Numerical Models and Observations
• Molecular Cloud Cores with High Deuterium Fractions: Nobeyama Mapping Survey
• Turbulence in Zeeman Measurements from Molecular Clouds
• A PPMAP analysis of the filamentary structures in Ophiuchus L1688 and L1689
• A cross-correlation analysis of CMB lensing and radio galaxy maps
• An ALMA search for substructure and fragmentation in starless cores in Orion B North
• The JCMT Gould Belt Survey: radiative heating by OB stars
• The JCMT Gould Belt Survey Complete Core Catalogue: Core mass function variations between nearby molecular clouds
• Prestellar Cores in Turbulent Clouds: Properties of Critical Cores
• First Detections of PN, PO, and PO+ toward a Shocked Low-mass Starless Core
• Deuterium fractionation in cold dense cores in the low-mass star forming region L1688
• Hunting pre-stellar cores with APEX: overview
• Chemical analysis of prestellar cores in Ophiuchus yields short timescales and rapid collapse