Interferometric Observations of High-Mass Star-Forming Clumps with Unusual N2H+/HCO+ Line Ratios

Ian W. Stephens, James M. Jackson, Patricio Sanhueza +4

The Millimetre Astronomy Legacy Team 90 GHz (MALT90) survey has detected high-mass star-forming clumps with anomalous N${}_2$H${}^{+}$/HCO${}^{+}$(1-0) integrated intensity ratios that are e…