Searching for -Ray Pulsars among Fermi Unassociated Sources: 2FGL J1906.5+0720
arXiv:1402.6401 · doi:10.1093/pasj/psu047
Abstract
We report the results from our analysis of the \textit{Fermi} Large Area Telescope data of the \textit{Fermi} unassociated source 2FGL J1906.50720, which is a high-ranked candidate pulsar. In order to better study our target, we first update the ephemeris for PSR J19070602, which is used to help remove any possible contamination due to strong emission from this nearby pulsar. From our analysis, 2FGL J1906.50720 is confirmed to have a significant low energy cutoff at 1~GeV in its emission (14--18 significance), consistent with those seen in young pulsars. We search for pulsations but no spin frequency signals are found in a frequency range of 0.5--32 Hz. No single model can fully describe the source's overall \fermi\ -ray spectrum, and the reason for this is the excess emission detected at energies of 4 GeV. The high-energy component possibly indicates emission from a pulsar wind nebula, when considering 2FGL J1906.50720 as a young pulsar. We conclude that 2FGL J1906.50720 is likely a pulsar based on the emission properties we have obtained, and observations at other energies are needed in order to confirm its pulsar nature.
17 pages, 5 figures, accepted for publication in PASJ
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