PHASE-RESOLVED SPECTRAL ANALYSIS OF 4U 1901+03 DURING ITS OUTBURST

被引：10
|
作者：
Lei, Ya-Juan [1 ]
Chen, Wei [1 ]
Qu, Jin-Lu [1 ]
Song, Li-Ming [1 ]
Zhang, Shu [1 ]
Lu, Yu [1 ]
Zhang, Hao-Tong [2 ]
Li, Ti-Pei [1 ,3 ]
机构：
[1] Chinese Acad Sci, Ctr Particle Astrophys, Inst High Energy Phys, Beijing 100049, Peoples R China
[2] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
[3] Tsinghua Univ, Ctr Astrophys, Beijing 100084, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2009年 / 707卷 / 02期
关键词：
pulsars: individual (4U 1901+03); stars: neutron; X-rays: stars; X-RAY PULSARS; BEPPOSAX OBSERVATIONS; RADIATIVE-TRANSFER; MAGNETIC-FIELDS; TIMING-EXPLORER; INTEGRAL DATA; LUMINOSITY; PROFILE; COMPTONIZATION; EXO-2030+375;
D O I：
10.1088/0004-637X/707/2/1016
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The high-mass X-ray binary 4U 1901+03 is reported to have a pulse profile evolving with the X-ray luminosity and energy during its outburst in 2003 February-July: the pulse peak changed from double to single along with the decreasing luminosity. We have carried out a detailed analysis on the contemporary phase-resolved energy spectrum of 4U 1901+03 as observed by the Rossi X-ray Timing Explorer. We find that the spectra are phase dependent. At the beginning of the outburst, the maximum of the optical depth for Compton scattering is near the major phase peak. During the decay of the outburst, the optical depth has the maximum away from the main peak of the pulse profile. For each observation, Fe K alpha emission line is detected in the phase-resolved spectra, and its flux is constant across the pulse phases. This suggests that the origin of the Fe emission is from the accretion disk, not the surface of the neutron star.
引用
收藏
页码：1016 / 1022
页数：7
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