Is RX J1856.5−3754 a Quark Star?
| Autor: | Fabrizio Nicastro, Herman L. Marshall, Antonella Fruscione, Jeremy J. Drake, Deron O. Pease, Vinay L. Kashyap, Klaus Werner, Michael Juda, Brad Wargelin, Stefan Dreizler, Peter E. Freeman |
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| Rok vydání: | 2002 |
| Předmět: | |
| Zdroj: | The Astrophysical Journal. 572:996-1001 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/340368 |
| Popis: | Deep Chandra LETG+HRC-S observations of the isolated neutron star candidate RX J1856.5-3754 have been analysed to search for metallic and resonance cyclotron spectral features and for pulsation behaviour. As found from earlier observations, the X-ray spectrum is well-represented by a ~ 60 eV (7e5 K) blackbody. No unequivocal evidence of spectral line or edge features has been found, arguing against metal-dominated models. The data contain no evidence for pulsation and we place a 99% confidence upper limit of 2.7% on the unaccelerated pulse fraction over a wide frequency range from 1e-4 to 100 Hz. We argue that the derived interstellar medium neutral hydrogen column density of 8e19 |
| Databáze: | OpenAIRE |
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