Search Results - Xuelei Chen
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Searching for Axion Dark Matter Gegenschein of the Vela Supernova Remnant with FAST
Published 2025-01-01Get full textAxions are one of the leading dark matter candidates. If we are embedded in a Milky Way dark matter halo comprised of axions, their stimulated decay would enable us to observe a counterimage (“axion gegenschein”) with a frequency equal to half the axion mass in the opposite direction of a bright rad...
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CRAFTS for H i Cosmology. I. Data Processing Pipeline and Validation Tests
Published 2025-01-01Get full textWe present the calibration procedures and validation of source measurement with the data of the Commensal Radio Astronomy FAST Survey for H i intensity mapping by the Five-hundred-meter Aperture Spherical Radio Telescope. Using a 70 hr drift-scan observation with the L -band (1.05–1.45 GHz) 19 beam...
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Polarization Position Angle Swing and the Rotating Vector Model of Repeating Fast Radio Bursts
Published 2025-01-01Get full textFast radio bursts (FRBs), typically highly polarized, usually have a nearly constant polarization position angle (PA) during each burst. Some bursts show significant PA variations, and one of them was claimed to have a PA variation pattern consistent with the prediction of the rotating vector model...
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