Closed-form expressions for Schwarzschild black hole mass, distance to Earth, and orbital radius are derived from photon frequency shift observables along the full orbit using redshift rapidity from symmetric emitter positions.
Gao, et al., The Megamaser Cosmology Project
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Quantitative estimates indicate SKA-Mid can detect substantially more water masers in distant AGN, enabling larger statistical samples and studies up to cosmological distances.
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Black hole mass and distance from accretion disk astrophysical observables
Closed-form expressions for Schwarzschild black hole mass, distance to Earth, and orbital radius are derived from photon frequency shift observables along the full orbit using redshift rapidity from symmetric emitter positions.
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Boosting Water Maser Studies in AGN with the SKA
Quantitative estimates indicate SKA-Mid can detect substantially more water masers in distant AGN, enabling larger statistical samples and studies up to cosmological distances.