Timing the Nearby Isolated Neutron Star RX J1856.5-3754
نویسندگان
چکیده
منابع مشابه
Timing 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 کاملTowards a Mass and Radius Determination of the Nearby Isolated Neutron Star Rx J185635-3754
We discuss efforts to determine the mass, radius, and surface composition of the nearby compact object RX J185635-3754 from its multi-wavelength spectral energy distribution. We compute non-magnetized model atmospheres and emergent spectra for selected compositions and gravities, and discuss efforts to fit existing and new observational data from ROSAT, EUVE and the HST. The spectral energy dis...
متن کاملA Deep Search for Pulsations from the Nearby Isolated Neutron Star Rx J1856.5−3754
We present the results of a deep search for pulsations from the nearby isolated neutron star RX J1856.5−3754 using the 450 ks Director’s Discretionary Time (DDT) Chandra LETG/HRC-S observation completed on 2001 Oct 15. No pulsations were detected. We find a 99% confidence upper limit on the pulsed fraction of ∼ 4.4% for worst-case sinusoidal pulsations with frequency . 50Hz and frequency deriva...
متن کاملRx 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 کاملAn unusual H α nebula around the nearby neutron star RX J 1856 . 5 − 3754 ⋆
We present spectroscopy and Hα imaging of a faint nebula surrounding the X-ray bright, nearby neutron star RX J1856.5−3754. The nebula shows no strong lines other than the Hydrogen Balmer lines and has a cometary-like morphology, with the apex being approximately 1′′ ahead of the neutron star, and the tail extending up to at least 25′′ behind it. We find that the current observations can be sat...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2008
ISSN: 0004-637X,1538-4357
DOI: 10.1086/528796