Large-Scale Spectroscopic Mapping of the $\rho$ Ophiuchi Molecular Cloud Complex I. The C${}_2$H to N${}_2$H${}^{+}$ Ratio as a Signpost of Cloud Characteristics

Zhichen Pan, Di Li, Qiang Chang +3

We present 2.5-square-degree C${}_2$H N=1-0 and N${}_2$H${}^{+}$ J=1-0 maps of the $\rho$ Ophiuchi molecular cloud complex. These are the first large-scale maps of the $\rho$ Ophiuchi molecula…