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Radio Pulsation Searches of Two Redback Binary MSP Candidates with the GBT

Presentation #116.102 in the session Stellar/Compact Objects.

Published onJul 01, 2023
Radio Pulsation Searches of Two Redback Binary MSP Candidates with the GBT

We report on searches for radio pulsations of two redback binary millisecond pulsar (MSP) candidates: Fermi LAT gamma-ray sources 3FGL J0212.1+5320 and 3FGL J0838.8-2829. Having both optical and X-ray counterparts, they exhibit properties strikingly similar to those of the sample of confirmed redback MSPs. We conducted five observations of 3FGL J0212.1+5320 from 2022 April – September using the Robert C. Byrd Green Bank Telescope at L-band (1 - 2 GHz), where we successfully detect the long-suspected pulsar. We repeat the same strategy for 3FGL J0838.8-2829, and plan to conduct the first observation in 2023 February. We present a multi-wavelength analysis of these two sources, motivated by our blind radio pulsation search results and derived parameters, if any, and complemented by existing X-ray and optical data. We explain the implications of our findings, including variability at different orbital phases, and ongoing efforts to learn more about each source.

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