Broad HCO+ absorption traces diffuse CO-dark H2 with f_mol=0.09, f_CNM=0.38, and CO abundance ≲10^{-5} relative to H2, undetected in CO emission or absorption below few×10^{19} cm^{-2}.
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Five new HI 21-cm absorption detections in LERGs and HERGs at z<0.5 reveal disturbed gas kinematics with velocity offsets over 350 km/s and a 3% detection rate consistent with lower-redshift samples.
The chapter proposes SKA spectroscopic surveys of the inner and outer Milky Way using OH, CH, radio recombination lines, and H2CO to study molecular cloud formation, ionized gas properties, and CO-dark molecular gas.
citing papers explorer
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CO-dark molecular gas traced by HCO$^+$ in the diffuse interstellar medium
Broad HCO+ absorption traces diffuse CO-dark H2 with f_mol=0.09, f_CNM=0.38, and CO abundance ≲10^{-5} relative to H2, undetected in CO emission or absorption below few×10^{19} cm^{-2}.
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HI 21-cm absorption in low- and high-excitation radio-loud AGNs at $z<0.5$ from MALS
Five new HI 21-cm absorption detections in LERGs and HERGs at z<0.5 reveal disturbed gas kinematics with velocity offsets over 350 km/s and a 3% detection rate consistent with lower-redshift samples.
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Spectroscopic surveys with the SKA probing the ionized and molecular Milky Way
The chapter proposes SKA spectroscopic surveys of the inner and outer Milky Way using OH, CH, radio recombination lines, and H2CO to study molecular cloud formation, ionized gas properties, and CO-dark molecular gas.