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Astron. Astrophys. 330, 175-180 (1998)

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A BeppoSAX observation of the X-ray pulsar 1E 2259+586
and the supernova remnant G109.1-1.0 (CTB 109)

A.N. Parmar 1, T. Oosterbroek 1, F. Favata 1, S. Pightling 2, M.J. Coe 2, S. Mereghetti 3 and G.L. Israel 4

1 Astrophysics Division, Space Science Department of ESA, ESTEC, P.O. Box 299, 2200 AG Noordwijk, The Netherlands
2 Department of Physics & Astronomy, The University, Southampton SO17 1BJ, UK
3 IFCTR, via Bassini 15, I-20133 Milano, Italy
4 Osservatorio Astronomico di Roma, via dell'Osservatorio 1, I-00040 Monteporzio Catone, Italy

Received 7 August 1997 / Accepted 16 September 1997


The 7 s X-ray pulsar 1E 2259+586 and the supernova remnant (SNR) G109.1-1.0 (CTB 109) were observed by BeppoSAX in 1996 November. The pulse period of [FORMULA]  s implies that 1E 2259+586 continues its near constant spin-down trend. The 0.5-10 keV pulse shape is characterized by a double peaked profile, with the amplitude of the second peak [FORMULA] 50% of that of the main peak. The pulse profile does not exhibit any strong energy dependence. We confirm the ASCA discovery of an additional low-energy spectral component from 1E 2259+586. This can best be modeled as a 0.44 keV blackbody, but we cannot exclude that some, or all, of this emission arises from the part of the SNR that lies within the pulsar's extraction region.

The spectrum of G109.1-1.0 is well fit with a non-equilibrium ionization plasma model with a best-fit temperature of 0.95 keV. The derived mass for the X-ray emitting plasma ([FORMULA] 15-20 M [FORMULA]) and its near cosmic abundances imply that the X-ray emission comes mainly from mildly enriched, swept-up circumstellar material. The spectrum is strongly out of equilibrium with an ionization age of only 3000 yr. This age is in good agreement with that derived from hydrodynamic simulations of the SNR using the above X-ray temperature.

Key words: stars: neutron – pulsars: individual (1E 2259+586) – ISM: individual objects: (G109.1-1.0) – X-rays: ISM – X-rays: stars

Send offprint requests to: A.N. Parmar (aparmar@astro.estec.esa.nl)

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© European Southern Observatory (ESO) 1998

Online publication: January 8, 1998