On the recently discovered pulsations from RX J1856.5-3754
نویسندگان
چکیده
منابع مشابه
A 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 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 کاملThe Parallax and Proper Motion of Rx J1856.5−3754 Revisited
RX J1856.5−3754, a bright soft X-ray source believed to be the nearest thermally emitting neutron star, has commanded and continues to command intense interest from X-ray missions. One of the main goals is to determine the radius of this neutron star. An integral part of the determination is an accurate parallax. Walter (2001) analyzed Hubble Space Telescope (HST ) data and derived a parallax, ...
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 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...
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ژورنال
عنوان ژورنال: New Astronomy
سال: 2008
ISSN: 1384-1076
DOI: 10.1016/j.newast.2007.06.007