1E 1207.4－5209是超新星遗迹PKS 1209－51/52中的一颗孤立中子星，文章给了Chandra对它X射线的谱的观测。在0.7和1.4keV上有明显的吸收。一个可能的解释是一价氦原子在强磁场中的跃迁。
The Astrophysical Journal, 574:L61–L64, 2002 July 20
DISCOVERY OF ABSORPTION FEATURES IN THE X-RAY SPECTRUM OF AN ISOLATED NEUTRON STAR
D. Sanwal,1 G. G. Pavlov,1 V. E. Zavlin,2 and M. A. Teter1
Received 2002 April 19; accepted 2002 June 17; published 2002 June 24
ABSTRACT
We observed 1E 1207.45209, a neutron star in the center of the supernova remnant PKS 120951/52, 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.
Subject headings: pulsars: individual (1E 1207.45209)—stars: neutron—
supernovae: individual (PKS 120951/52)—X-rays: stars
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