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- Title
Suzaku view of the neutron star in the dipping source 4U 1822−37.
- Authors
Sasano, Makoto; Makishima, Kazuo; Sakurai, Soki; Zhang, Zhongli; Enoto, Teruaki
- Abstract
The dipping X-ray source 4U 1822−37 was observed by Suzaku on 2006 October 20 for a net exposure of 37 ks. The source was detected with the XIS at a 1–10 keV flux of 5.5 × 10−10 erg cm−2 s−1, and with the HXD (HXD-PIN) at a 10–50 keV flux of 8.9 × 10−10 erg cm−2 s−1. With HXD-PIN, the pulsation was detected at a barycentric period of 0.592437 s, and its change rate was reconfirmed as −2.43 × 10−12 s s−1. The 1–50 keV spectra of 4U 1822−37 were found to be very similar to those of Her X-1 in the slopes, cutoff, and iron lines. Three iron lines (Fe Kα, Fe xxv, and Fe xxvi) were detected, on top of a 1–50 keV continuum that is described by an NPEX model plus a soft blackbody. In addition, a cyclotron resonance scattering feature was detected significantly (> 99% confidence), at an energy of 33 ± 2 keV with a depth of 0.4$^{ + 0.6}_{-0.3}$. Therefore, the neutron star in this source is concluded to have a strong magnetic field of 2.8 × 1012 G. Further assuming that the source has a relatively high intrinsic luminosity of several times 1037 erg s−1, its spectral and timing properties are consistently explained.
- Subjects
STELLAR magnetic fields; ACCRETION disks; X-ray binaries; BARYCENTRIC dynamical time; NEUTRON stars; STELLAR oscillations; CYCLOTRON resonance; GALACTIC X-ray sources
- Publication
Publications of the Astronomical Society of Japan, 2014, Vol 66, Issue 2, p1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psu002