期刊
ASTROPHYSICAL JOURNAL
卷 574, 期 1, 页码 L61-L64出版社
UNIV CHICAGO PRESS
DOI: 10.1086/342368
关键词
pulsars : individual (1E 1207.4-5209); stars : neutron; supernovae : individual (PKS 1209-51/52); X-rays : stars
We observed 1E 1207.4-5209, a neutron star in the center of the supernova remnant PKS 1209-51/52, with the ACIS detector aboard the Chandra X-Ray Observatory and detected two absorption features in the source spectrum. The features are centered near 0.7 and 1.4 keV; their equivalent widths are about 0.1 keV. We discuss various possible interpretations of the absorption features and exclude some of them. A likely interpretation is that the features are associated with atomic transitions of once-ionized helium in the neutron star atmosphere with a strong magnetic field. The first clear detection of absorption features in the spectrum of an isolated neutron star provides an opportunity to measure the mass-to-radius ratio and to constrain the equation of state of the superdense matter.
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