MULTI-WAVELENGTH OBSERVATIONS OF 3FGL J2039.6–5618: A CANDIDATE REDBACK MILLISECOND PULSAR
| العنوان: | MULTI-WAVELENGTH OBSERVATIONS OF 3FGL J2039.6–5618: A CANDIDATE REDBACK MILLISECOND PULSAR |
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| المؤلفون: | C. Pallanca, D. Pizzocaro, C. Delvaux, Roberto Mignani, Werner Becker, Jochen Greiner, A. A. Breeveld, David Salvetti, A. De Luca, Andrea Belfiore, M. Marelli |
| المساهمون: | Salvetti, D., Mignani, R.P., Luca, A. De, Delvaux, C., Pallanca, C., Belfiore, A., Marelli, M., Breeveld, A.A., Greiner, J., Becker, W., Pizzocaro, D., DEU |
| المصدر: | NASA Astrophysics Data System |
| بيانات النشر: | American Astronomical Society, 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Photon, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Flux, Astronomy and Astrophysics, Astrophysics, Light curve, Orbital period, stars: variables: general, Neutron star, binaries: general, Pulsar, gamma rays: star, Space and Planetary Science, Millisecond pulsar, pulsars: general, Astrophysics - High Energy Astrophysical Phenomena, Fermi Gamma-ray Space Telescope |
| الوصف: | We present multi-wavelength observations of the unassociated gamma-ray source 3FGL J2039.6-5618 detected by the Fermi Large Area Telescope. The source gamma-ray properties suggest that it is a pulsar, most likely a millisecond pulsar, for which neither radio nor $\gamma$-ray pulsations have been detected yet. We observed 3FGL J2039.6-5618 with XMM-Newton and discovered several candidate X-ray counterparts within/close to the gamma-ray error box. The brightest of these X-ray sources is variable with a period of 0.2245$\pm$0.0081 d. Its X-ray spectrum can be described by a power law with photon index $\Gamma_X =1.36\pm0.09$, and hydrogen column density $N_{\rm H} < 4 \times 10^{20}$ cm$^{-2}$, which gives an unabsorbed 0.3--10 keV X-ray flux of $1.02 \times 10^{-13}$ erg cm$^{-2}$ s$^{-1}$. Observations with the Gamma-Ray Burst Optical/Near-Infrared Detector (GROND) discovered an optical counterpart to this X-ray source, with a time-average magnitude $g'\sim 19.5$. The counterpart features a flux modulation with a period of 0.22748$\pm$0.00043 d that coincides, within the errors, with that of the X-ray source, confirming the association based on the positional coincidence. We interpret the observed X-ray/optical periodicity as the orbital period of a close binary system where one of the two members is a neutron star. The light curve profile of the companion star, with two asymmetric peaks, suggests that the optical emission comes from two regions at different temperatures on its tidally-distorted surface. Based upon its X-ray and optical properties, we consider this source as the most likely X-ray counterpart to 3FGL J2039.6-5618, which we propose to be a new redback system. Comment: 35 pages, 8 figures, accepted for publication on Astrophysical Journal |
| وصف الملف: | STAMPA |
| تدمد: | 1538-4357 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85dc37ba626acbb5b500ab2528673c02 https://doi.org/10.1088/0004-637x/814/2/88 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....85dc37ba626acbb5b500ab2528673c02 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15384357 |
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