The discovery of 12-min X-ray pulsations from 1WGA J1958.2+3232 |
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| Authors: | G L Israel L Angelini S Campana P Giommi L Stella & N E White |
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| Institution: | Osservatorio Astronomico di Roma, Vicolo dell'Osservatorio 2, I-00040 Monteporzio Catone, Roma, Italy,;Laboratory for High Energy Astrophysics, Code 662, NASA —Goddard Space Flight Center, Greenbelt, MD 20771, USA,;Universities Space Research Association,;Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate, Lecco, Italy,;SAX Science Data Center, ASI, Viale Regina Margherita 202, I-00198 Roma, Italy |
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| Abstract: | During a systematic search for periodic signals in a sample of ROSAT PSPC (0.1–2.4 keV) light curves, we have discovered ～12-min large-amplitude X-ray pulsations in 1WGA J1958.2+3232, an X-ray source which lies close to the Galactic plane. The energy spectrum is well fitted by a power law with a photon index of 0.8, corresponding to an X-ray flux level of ～ 10?12 erg cm?2 s?1. The source is probably a long-period, low-luminosity X-ray pulsar, similar to X Per, or an intermediate polar. |
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| Keywords: | stars: individual: 1WGA J1958 2+3232 novae cataclysmic variables pulsars: general stars: rotation X-rays: stars |
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