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Issue A&A Volume 383, Number 1, February III 2002 Page(s) 182 - 187 Section Formation, structure and evolution of stars DOI 10.1051/0004-6361:20011718

A&A 383, 182-187 (2002)
DOI: 10.1051/0004-6361:20011718

The anomalous X-ray pulsar 1E 1048.1-5937: Phase resolved spectroscopy with the XMM-Newton satellite

A. Tiengo^{1, 2}, E. Göhler³, R. Staubert³ and S. Mereghetti<sup>1

1</sup>  Istituto di Fisica Cosmica "G. Occhialini", via Bassini 15, 20133 Milano, Italy
²  XMM-Newton Science Operation Center, Vilspa ESA, Apartado 50727, 28080 Madrid, Spain
³  Univ. Tübingen, Inst. fur Astronomie und Astrophysik, Abt. Astronomie, Waldhauserstr., 72076 Tübingen, Germany

(Received 18 September 2001 / Accepted 21 November 2001)

Abstract
We report on an observation of the anomalous X-ray pulsar 1E 1048.1-5937 performed with the XMM-Newton satellite. The phase averaged spectrum of 1E 1048.1-5937 is well described by the sum of a power law with photon index ~2.9 and a blackbody with temperature ~0.6 keV, without evidence for significant absorption or emission lines. The above spectral parameters do not vary during the phases corresponding to the broad pulse, while the off pulse emission shows a different spectrum characterized by a soft excess at energies below ~1.5 keV. The XMM-Newton observation and a re-analysis of archival BeppoSAX data show that the spectral parameters and flux of 1E 1048.1-5937 did not change significantly during observations spanning the last four years. All the data are consistent with a 2-10 keV luminosity varying in the range ~(5-7) 10 ³³ erg s ^-1 (for a distance of 3 kpc).

Key words: stars: individual: 1E 1048.1-5937  -- X-rays: stars

Offprint request: A. Tiengo, tiengo@ifctr.mi.cnr.it

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© ESO 2002

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