Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...657l.101t&link_type=abstract
The Astrophysical Journal, Volume 657, Issue 2, pp. L101-L104.
Astronomy and Astrophysics
Astronomy
31
Stars: Pulsars: General, Stars: Individual: Alphanumeric: Rx J1856.5-3754, Stars: Neutron
Scientific paper
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 other six thermally emitting, nearby neutron stars discovered in soft X-rays with ROSAT. The pulsations are detected at consistent periods in several XMM-Newton observations spanning from 2002 April to 2006 October, yielding an upper limit of P˙<1.9×10-12 s s-1 (90% c.l.) on the period derivative. This implies a surface magnetic field smaller than 1.2×1014 G, under the usual assumption of vacuum dipole magnetic braking. The pulse profile is nearly sinusoidal with a pulsed fraction in the 0.15-1.2 keV range of only ~1.2%, the smallest ever seen in an isolated X-ray pulsar.
Mereghetti Sandro
Tiengo Andrea
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