Revealing a New Black Widow Binary 4FGL J0336.0+7502
| Autor: | Li, Kwan-Lok, Yap, Y. X. Jane, Hui, Chung Yue, Kong, Albert K. H. |
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| Rok vydání: | 2021 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/1538-4357/abeb76 |
| Popis: | We report on a discovery of a promising candidate as a black widow millisecond pulsar binary, 4FGL J0336.0+7502, which shows many pulsar-like properties in the 4FGL-DR2 catalog. Within the 95% error region of the LAT source, we identified an optical counterpart with a clear periodicity at P(orb) = 3.718178(9) hours using the Bohyunsan 1.8-m Telescope, Lulin One-meter Telescope, Canada-France-Hawaii Telescope, and Gemini-North. At the optical position, an X-ray source was marginally detected in the Swift/XRT archival data, and the detection was confirmed by our Chandra/ACIS DDT observation. The spectrum of the X-ray source can be described by a power-law model of Gamma = 1.6+/-0.7 and F(0.3-7keV) = 3.5e-14 erg/cm^2/s. The X-ray photon index and the low X-ray-to-gamma-ray flux ratio (i.e., < 1%) are both consistent with that of many known black widow pulsars. There is also a hint of an X-ray orbital modulation in the Chandra data, although the significance is very low (1.3 sigma). If the pulsar identity and the X-ray modulation are confirmed, it would be the fifth black widow millisecond pulsar binary that showed an orbitally-modulated emission in X-rays. Comment: 7 pages, including 5 figures and 2 table. Accepted for publication in ApJ |
| Databáze: | arXiv |
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