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Title:
BeppoSAX Observations of the Young Pulsar in the Kes 75 Supernova Remnant
Authors:
Mereghetti, S.; Bandiera, R.; Bocchino, F.; Israel, G. L.
Affiliation:
AA(Istituto di Astrofisica Spaziale e Fisica Cosmica, Sezione di Milano ``G. Occhialini,'' via Bassini 15, I-20133 Milan, Italy; ), AB(Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Florence, Italy; ), AC(Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, I-90134 Palermo, Italy; ), AD(Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monteporzio Catone, Italy; )
Publication:
The Astrophysical Journal, Volume 574, Issue 2, pp. 873-878. (ApJ Homepage)
Publication Date:
08/2002
Origin:
UCP
ApJ Keywords:
Stars: Pulsars: Individual: Alphanumeric: PSR J1846-0258, Stars: Neutron, Stars: Supernovae: Individual: Alphanumeric: G29.7-0.3
DOI:
10.1086/340976
Bibliographic Code:
2002ApJ...574..873M

Abstract

We present the results of BeppoSAX observations of the young X-ray pulsar PSR J1846-0258, recently discovered at the center of the composite supernova remnant Kes 75. The pulsar (plus nebula) spectrum can be fitted by an absorbed power law with photon index αph=2.16+/-0.15, NH=(4.7+/-0.8)×1022 cm-2, and unabsorbed flux ~3.9×10-11 ergs cm-2 s-1 (2-10 keV). By joining two observations taken at an interval of 2 weeks, we have been able to obtain a precise measurement of the spin period (P=324.818968+/-0.000006 ms). This value, when combined with previous measurements, cannot be fitted by a smooth frequency evolution with a canonical braking index n=3. With the hypothesis of no glitches and/or significant timing noise, the braking index would be n=1.86+/-0.08, and assuming a short initial period, the pulsar age would be ~1700 yr, closer to that of the supernova remnant than the simple estimate τ=P/2P=723 yr. Other likely possibilities involve the presence of glitches and lead to a wide range of acceptable ages. For example, we obtain n in the range 1.8-2.5 if a glitch occurred near MJD 51500, while for a glitch between 1993 October and 1999 March, we can only get a lower limit of n>1.89.
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