The Green Bank Ammonia Survey: Observations of Hierarchical Dense Gas Structures in Cepheus-L1251
Jared Keown, James Di Francesco, Helen Kirk, Rachel K. Friesen, Jaime, E. Pineda, Erik Rosolowsky, Adam Ginsburg, Stella S. R. Offner, Paola, Caselli, Felipe Alves, Ana Chac\'on-Tanarro, Anna Punanova, Elena Redaelli,, Young Min Seo, Christopher D. Matzner

TL;DR
This study uses ammonia observations to identify hierarchical dense gas structures in Cepheus-L1251, analyzing their physical properties, stability, and relation to dust cores, revealing insights into their gravitational states and chemical composition.
Contribution
The paper presents a detailed hierarchical analysis of dense gas structures using NH$_3$ data and compares them with Herschel dust cores, providing new insights into their physical and chemical properties.
Findings
Structures are compact and correlated with high-density regions.
Ammonia structures are gravitationally bound or near virial equilibrium.
Most Herschel cores are pressure-confined and not gravitationally bound.
Abstract
We use Green Bank Ammonia Survey observations of NH (1,1) and (2,2) emission with 32'' FWHM resolution from a ~ 10 pc portion of the Cepheus-L1251 molecular cloud to identify hierarchical dense gas structures. Our dendrogram analysis of the NH data results in 22 top-level structures, which reside within 13 lower-level, parent structures. The structures are compact (0.01 pc 0.1 pc) and are spatially correlated with the highest H column density portions of the cloud. We also compare the ammonia data to a catalog of dense cores identified by higher-resolution (18.2'' FWHM) Herschel Space Observatory observations of dust continuum emission from Cepheus-L1251. Maps of kinetic gas temperature, velocity dispersion, and NH column density, derived from detailed modeling of the NH data, are used to investigate the stability and chemistry of…
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