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Title:
The X-Ray Source at the Center of the Cassiopeia A Supernova Remnant
Authors:
Mereghetti, S.; Tiengo, A.; Israel, G. L.
Affiliation:
AA(Istituto di Fisica Cosmica G. Occhialini-CNR, via Bassini 15, I-20133 Milan, Italy; ), AB(XMM-Newton Science Operation Center VILSPA ESA, Apartado 50727, 28080 Madrid, Spain; ), AC(Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monteporzio Catone, Italy; )
Publication:
The Astrophysical Journal, Volume 569, Issue 1, pp. 275-279. (ApJ Homepage)
Publication Date:
04/2002
Origin:
UCP
ApJ Keywords:
Stars: Neutron, Stars: Supernovae: Individual: Name: Cassiopeia A, X-Rays: Stars
DOI:
10.1086/339277
Bibliographic Code:
2002ApJ...569..275M

Abstract

We present the first results of an XMM-Newton observation of the central X-ray source in the Cas A supernova remnant. The spectrum can be fitted equally well with an absorbed steep power law (αph~3, NH~1.5×1022 cm-2) or with a bremsstrahlung with temperature kT~2.4 keV and NH~1022 cm-2. A blackbody model (kTBB~0.7 keV) gives a slightly worse fit and requires a column density NH~5×1021 cm-2 and an emitting area with radius ~0.3 km (for d=3.4 kpc). A search for pulsations for periods longer than 150 ms gave negative results. The 3 σ upper limits on the pulsed fraction are ~13% for P>0.3 s and ~7% for P>3 s. The overall properties of the central X-ray source in Cas A are difficult to explain in terms of a rapidly spinning neutron star with a canonical magnetic field of ~1012 G, and are more similar to those of slowly rotating neutron stars such as the anomalous X-ray pulsars.
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