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Cerenkov microwave line emission of hydroxyl radical |
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| Institution: | 1. Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China;2. SKLTCS, CAPT, BIC-ESAT, College of Engineering, Peking University, Beijing 100871, China;3. Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden |
| Abstract: | We propose to interpret the nonthermal emission lines of molecular clouds by a Cerenkov radio line emission mechanism. Relativistic electrons passing through a cloud with population inversion can generate microwave emission lines of anomalous intensity ratios. Calculations for nonthermal emission lines of OH sources of Group I Ia associated with supernova remnants show that this nonthermal mechanism may provide a hopeful way of solving certain difficulties of the theory of celestial masers. |
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