Searches for millisecond pulsar candidates among the unidentified Fermi objects
| Autor: | Hui, C. Y., Park, S. M., Hu, C. P., Lin, L. C. C., Li, K. L., Kong, A. K. H., Tam, P. H. T., Takata, J., Cheng, K. S., Jin, Ruolan, Yen, T. -C., Kim, Chunglee |
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| Rok vydání: | 2015 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0004-637X/809/1/68 |
| Popis: | Here we report the results of searching millisecond pulsar (MSP) candidates from the Fermi LAT second source catalog (2FGL). Seven unassociated $\gamma-$ray sources in this catalog are identified as promising MSP candidates based on their $\gamma$-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 with the corresponding $\gamma$-ray fluxes. The X-ray to $\gamma$-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 for performing 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 that 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, which make them as the promising targets for follow-up investigations. Comment: 37 pages, 12 figures, 6 tables, accepted for publication in ApJ |
| Databáze: | arXiv |
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