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The Nearby Neutron Star RX J0720.4-3125 from Radio to X-rays | | D. L. Kaplan
; M. H. van Kerkwijk
; H. L. Marshall
; B. A. Jacoby
; S. R. Kulkarni
; D. A. Frail
; | | Date: |
6 Mar 2003 | | Journal: | Astrophys.J. 590 (2003) 1008-1019 | | Subject: | astro-ph | | Abstract: | We present radio, optical, ultraviolet, and X-ray observations of the isolated, thermally-emitting neutron star RX J0720.4-3125 using the Parkes radio telescope, the Very Large Array, the Hubble Space Telescope, and the Chandra X-ray Observatory. From these data we show that the optical/UV spectrum of RX J0720.4-3125 is not well fit by a Rayleigh-Jeans tail as previously thought, but is instead best fit by either a single non-thermal power-law or a combination of a Rayleigh-Jeans tail and a non-thermal power-law. Taken together with the X-ray spectrum, we find the best model for RX J0720.4-3125 to be two blackbodies plus a power-law, with the cool blackbody implying a radius of 11-13 km at an assumed distance of 300 pc. This is similar to many middle aged (10^{5-6} yr) radio pulsars such as PSR B0656+14, evidence supporting the hypothesis that RX J0720.4-3125 is likely to be an off-beam radio pulsar. The radio data limit the flux at 1.4 GHz to be <0.24 mJy, or a luminosity limit of 4*pi*d^2*F < 3e25*d_300^2 ergs/s, and we see no sign of extended nebulosity, consistent with expectations for a pulsar like RX J0720.4-3125. | | Source: | arXiv, astro-ph/0303126 | | Services: | Forum | Review | PDF | Favorites | |
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