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Title:
XMM-Newton Discovery of 7 s Pulsations in the Isolated Neutron Star RX J1856.5-3754
Authors:
Tiengo, Andrea; Mereghetti, Sandro
Affiliation:
AA(INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica, Milano, Italy; , ), AB(INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica, Milano, Italy; , )
Publication:
The Astrophysical Journal, Volume 657, Issue 2, pp. L101-L104. (ApJL Homepage)
Publication Date:
03/2007
Origin:
UCP
ApJ Keywords:
Stars: Pulsars: General, Stars: Individual: Alphanumeric: RX J1856.5-3754, Stars: Neutron
DOI:
10.1086/513143
Bibliographic Code:
2007ApJ...657L.101T

Abstract

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.
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