The puzzles of RX J1856.5-3754: neutron star or quark star?
نویسندگان
چکیده
منابع مشابه
Rx J1856.5-3754: Bare Quark Star or Naked Neutron Star?
Recent Chandra observations have convincingly shown that the soft X-ray emission from the isolated neutron star candidate RX J1856.5-3754 is best represented by a featureless blackbody spectrum, in apparent contrast with the predictions of current neutron star atmospheric models. Moreover, the recently measured star distance (≈ 120−140 pc) implies a radiation radius of at most ∼ 5−6 km, too sma...
متن کاملTiming the Nearby Isolated Neutron Star Rx J1856.5−3754
RX J1856.5−3754 is the X-ray brightest among the nearby isolated neutron stars. Its X-ray spectrum is thermal, and is reproduced remarkably well by a black-body, but its interpretation has remained puzzling. One reason is that the source did not exhibit pulsations, and hence a magnetic field strength—vital input to atmosphere models—could not be estimated. Recently, however, very weak pulsation...
متن کاملXmm-newton Discovery of 7 S Pulsations in the Isolated Neutron Star Rx J1856.5–3754
Thanks to the high counting statistics provided by a recent XMM-Newton observation of RX J1856.5–3754 we have discovered that this isolated neutron star pulsates at a period of 7.055 s. This confirms that RX J1856.5–3754 is similar in nature to the the other six thermally emitting, nearby neutron stars discovered in soft X–rays with ROSAT. The pulsations are detected at consistent periods in se...
متن کاملOptical spectroscopy and photometry of the neutron star RX J 1856 . 5 − 3754 ⋆
We present spectroscopy and imaging with the Very Large Telescope (VLT) of the neutron star RX J1856.5−3754. Little is known about the nature of this source other than that it is a nearby hot neutron star. Our VLT spectrum does not show any strong emission or absorption features. With considerable care to photometric calibration, we obtain photometric measurements over the optical and ultra-vio...
متن کاملConstraining the geometry of the neutron star RX J 1856 . 5 − 3754
RX J1856.5−3754 is one of the brightest, nearby isolated neutron stars, and considerable observational resources have been devoted to its study. In previous work, we found that our latest models of a magnetic, hydrogen atmosphere matches well the entire spectrum, from X-rays to optical (with best-fitting neutron star radius R ≈ 14 km, gravitational redshift zg ∼ 0.2, and magnetic field B ≈ 4 × ...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2004
ISSN: 0920-5632
DOI: 10.1016/j.nuclphysbps.2004.04.094