Herschel* Observations of Interstellar Chloronium. II. Detections toward G29.96-0.02, W49N, W51, and W3(OH), and Determinations of the Ortho-to-Para and 35Cl/37Cl Isotopic Ratios

摘要: We report additional detections of the chloronium molecular ion, H_2C^l+, toward four bright submillimeter continuum sources: G29.96-0.02, W49N, W51, and W3(OH). With use HIFI instrument on board Herschel Space Observatory, we observed 2_(12)-1_(01) transition ortho-H_2^{35}Cl^+ at 781.627 GHz in absorption all sources. Much detected arises diffuse foreground clouds that are unassociated with background sources which our best estimates N(H_2Cl^+)/N(H) ratio lie range (0.9–4.8) x 10^(-9). These abundances relative to atomic hydrogen can exceed predictions current astrochemical models by up a factor 5. Toward have also ortho-H_2^{37}Cl^+ 780.053 1_(11)-0_(00) para-H_2^{35}Cl^+ 485.418 GHz. observations imply (H_2^{35}Cl^+)/(H_2^{37}Cl^+) column density ratios consistent solar system ^(35)Cl/^(37)Cl isotopic 3.1, ortho-to-para 3, spin statistical weights.