High abundance ratio of 13CO to C18O toward photon-dominated regions in the Orion-A giant molecular cloudReportar como inadecuado




High abundance ratio of 13CO to C18O toward photon-dominated regions in the Orion-A giant molecular cloud - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

* Corresponding author 1 AIM - UMR 7158 - UMR E 9005 - Astrophysique Interactions Multi-échelles 2 NAOJ - National Astronomical Observatory of Japan 3 Nobeyama Radio Observatory 4 ISAS - Institute of Space and Astronautical Science 5 ALMA Observatory 6 Ibaraki University 7 Tokyo Gakugei University 8 The University of Tokyo 9 Osaka Prefecture University

Abstract : Aims. We derive physical properties such as the optical depths and the column densities of 13CO and C18O to investigate the relationship between the far ultraviolet FUV radiation and the abundance ratios between 13CO and C18O.Methods. We have carried out wide-field 0.4 deg2 observations with an angular resolution of 25.8″ ~0.05 pc in 13CO J = 1–0 and C18O J = 1–0 toward the Orion-A giant molecular cloud using the Nobeyama 45 m telescope in the on-the-fly mode.Results. Overall distributions and velocity structures of the 13CO and C18O emissions are similar to those of the 12CO J = 1–0 emission. The optical depths of the 13CO and C18O emission lines are estimated to be 0.05 < τ13CO < 1.54 and 0.01



Autor: Yoshito Shimajiri - Yoshimi Kitamura - Masao Saito - Munetake Momose - Fumitaka Nakamura - Kazuhito Dobashi - Tomomi Shimoikura -

Fuente: https://hal.archives-ouvertes.fr/



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