From Old to Young Stars
9-13 Jul 2018 Quy Nhon (Vietnam)
Dense Molecular Knots in the Crab Supernova Remnant
Henry Wootten  1@  , Rory Bentley, Jack Baldwin, Françoise Combes, Andrew Fabian, Gary Ferland, Ed Loh, Philippe Salomé  2@  , A. Castro-Carrizo@
1 : National Radio Astronomy Observatory [Charlottesville]  (NRAO)
Charlottesville, 22903 VA -  United States
2 : Laboratoire dÉtude du Rayonnement et de la Matière en Astrophysique
Observatoire de Paris, Centre National de la Recherche Scientifique : UMR8112

Molecular emission was imaged with ALMA from numerous components located at or near bright H2-emitting knots and/or absorbing dust globules in the Crab Nebula. These observations provide insight into how energetic photons and particles produced in a young supernova remnant interact with gas, cleanly differentiating between competing models. The four locations targeted show contrasting properties. Our successful observations are contrasted with Cloudy models of these knots. We suggest that the Crab filaments present an exotic environment in which H2 emission comes from a mostly-neutral zone probably heated by cosmic rays produced in the supernova. We detect carbon monoxide emission from many clumps distributed throughout the regions imaged with characteristics consistent with predictions based on the CLOUDY photoionization model of one of the dust globules in the nebula. Emission from HCO+ (J=4-3), SiO (J=8-7), and SO (89-78) transitions was also observed from the strongest CO-emitting region. The molecular knots in the Crab present a novel very young phase of the ISM representative of many important astrophysical environments.



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