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The Effect Of 53 ΜM Ir Radiation On 18 Cm Oh Megamaser Emission, Philip Lockett, Moshe Elitzur
The Effect Of 53 ΜM Ir Radiation On 18 Cm Oh Megamaser Emission, Philip Lockett, Moshe Elitzur
Physics and Astronomy Faculty Publications
OH megamasers (OHMs) emit primarily in the main lines at 1667 and 1665 MHz and differ from their Galactic counterparts due to their immense luminosities, large line widths, and 1667/1665 MHz flux ratios, which are always greater than 1. We find that these maser properties result from strong 53 μm radiative pumping combined with line overlap effects caused by turbulent line widths ~20 km s-1 pumping calculations that do not include line overlap are unreliable. A minimum dust temperature of ~45 K is needed for inversion, and maximum maser efficiency occurs for dust temperatures ~80-140 K. We find …