A Yebes W-band Line Survey towards an Unshocked Molecular Cloud of Supernova Remnant 3C391: Evidence of Cosmic-Ray-Induced Chemistry
Authors: Tian-Yu Tu, Prathap Rayalacheruvu, Liton Majumdar, Yang Chen*, Ping Zhou, Miguel Santander-García
In this paper, we present a Yebes W band (71.5-90 GHz) line survey towards an unshocked MC towards SNR 3C391. We find lower N (HCO+)/N(HOC+), higher N (HCS+)/N(CS), and higher X(l-C3H+) by an order of magnitude compared with typical values in MCs. Through chemical simulation with DNautilus, we find that the chemistry can be due to a CR ionization rate of $10^{-15}$ or $10^{-14}\rm \ s^{-1}$.
