SEARCHES FOR MILLISECOND PULSAR CANDIDATES AMONG THE UNIDENTIFIED FERMI OBJECTS
- Department of Astronomy and Space Science, Chungnam National University, Daejeon (Korea, Republic of)
- Graduate Institute of Astronomy, National Central University, Jhongli 32001, Taiwan (China)
- Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan (China)
- Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu, Taiwan (China)
- Institute of Astronomy and Space Science, Sun Yat-Sen University, Guangzhou 510275 (China)
- Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong (China)
- Yonsei University Observatory, Yonsei University, Seoul (Korea, Republic of)
Here we report the results of searching millisecond pulsar (MSP) candidates from the Fermi LAT second source catalog (2FGL). Seven unassociated γ-ray sources in this catalog are identified as promising MSP candidates based on their γ-ray properties. Through the X-ray analysis, we have detected possible X-ray counterparts, localized to an arcsecond accuracy. We have systematically estimated their X-ray fluxes and compared them with the corresponding γ-ray fluxes. The X-ray to γ-ray flux ratios for 2FGL J1653.6-0159 and 2FGL J1946.4-5402 are comparable with the typical value for pulsars. For 2FGL J1625.2-0020, 2FGL J1653.6-0159, and 2FGL J1946.4-5402, their candidate X-ray counterparts are bright enough to perform a detailed spectral and temporal analysis to discriminate their thermal/non-thermal nature and search for the periodic signal. We have also searched for possible optical/IR counterparts at the X-ray positions. For the optical/IR source coincident with the brightest X-ray object associated with 2FGL J1120.0-2204, its spectral energy distribution is comparable with a late-type star. Evidence for the variability has also been found by examining its optical light curve. All the aforementioned 2FGL sources resemble a pulsar in one or more aspects, making them promising targets for follow-up investigations.
- OSTI ID:
- 22525607
- Journal Information:
- Astrophysical Journal, Vol. 809, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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