Near infrared VLT/MAD observations of the isolated neutron stars RX J0420.0-5022 and 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 کاملBare Quark Stars or Naked Neutron Stars ? the Case of Rx J1856.5-3754
In a cool neutron star (T . 10 K) endowed with a rather high magnetic field (B & 10 G), a phase transition may occur in the outermost layers. As a consequence the neutron star becomes “bare”, i.e. no gaseous atmosphere sits on the top of the crust. The surface of a cooling, bare neutron star does not necessarily emit a blackbody spectrum because the emissivity is strongly suppressed at energies...
متن کاملRadio Observations of Two Isolated Neutron Stars , RX J 0720 . 4 – 3125 and RX J 0806 . 4 – 4132
Radio observations of two isolated neutron stars, RX J0720.4–3125 and RX J0806.4– 4132, have been made with the Australia Telescope Compact Array at a frequency of 1.4 GHz. No continuum emission is detected from either object with a 3-σ upper limit of 0.2 mJy. The data were also folded synchronously with the known rotation periods of 8.4 and 11.4 s respectively. No pulsed emission was detected....
متن کاملOptical Observations of the Isolated Neutron Star RX J0720.4−3125
RX J0720.4−3125 is an unidentified bright soft X-ray source which shows pulsations at a 8.39 s period and has a thermal spectrum. We present deep B and R band images of its X-ray localization. We find one possible counterpart in the X-ray error box, with magnitudes B = 26.6±0.2 and R = 26.9±0.3. The very high X-ray to optical flux ratio confirms that this object is an isolated neutron star. We ...
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...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2008
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:200809926