The hard X-ray emission of X Persei

被引:47
作者
Doroshenko, V. [1 ]
Santangelo, A. [1 ]
Kreykenbohm, I. [2 ,3 ]
Doroshenko, R. [1 ]
机构
[1] Kepler Ctr Astro & Particle Phys, Inst Astron & Astrophys, D-72076 Tubingen, Germany
[2] Dr Karl Remeis Sternwarte, D-96049 Bamberg, Germany
[3] ECAP, D-91058 Erlangen, Germany
关键词
X-rays: binaries; pulsars: individual: X Persei; stars: neutron; ACCRETING NEUTRON-STARS; IUE OBSERVATIONS; SPECTRUM; PULSARS; COMPTONIZATION; LUMINOSITY; SCATTERING; MODEL;
D O I
10.1051/0004-6361/201218878
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present an analysis of the spectral properties of the peculiar X-ray pulsar X Per based on INTEGRAL observations. We show that the source exhibits an unusually hard spectrum and is confidently detected by ISGRI up to more than 100 keV. We find that two distinct components may be identified in the broadband 4-200 keV spectrum of the source. We interpret these components as the result of thermal and bulk Comptonization in the vicinity of the neutron star and describe them with several semi-phenomenological models. The previously reported absorption feature at similar to 30 keV is not required in the proposed scenario and therefore its physical interpretation must be taken with caution. We also investigated the timing properties of the source in the framework of existing torque theory, concluding that the observed phenomenology can be consistently explained if the magnetic field of the neutron star is similar to 10(14) G.
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页数:4
相关论文
共 34 条
[1]   LIMITING LUMINOSITY OF ACCRETING NEUTRON STARS WITH MAGNETIC-FIELDS [J].
BASKO, MM ;
SUNYAEV, RA .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1976, 175 (02) :395-417
[2]   Spectral formation in X-ray pulsar accretion columns [J].
Becker, PA ;
Wolff, MT .
ASTROPHYSICAL JOURNAL, 2005, 621 (01) :L45-L48
[3]   Thermal and bulk comptonization in accretion-powered X-ray pulsars [J].
Becker, Peter A. ;
Wolff, Michael T. .
ASTROPHYSICAL JOURNAL, 2007, 654 (01) :435-457
[4]  
BERNACCA PL, 1981, ASTRON ASTROPHYS, V94, P345
[5]  
BISNOVATYIKOGAN GS, 1991, ASTRON ASTROPHYS, V245, P528
[6]   COMPTON-SCATTERING IN A CONVERGING FLUID-FLOW .1. THE TRANSFER EQUATION [J].
BLANDFORD, RD ;
PAYNE, DG .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1981, 194 (03) :1033-1039
[7]   Discovery of a cyclotron resonant scattering feature in the Rossi X-ray Timing Explorer spectrum of 4U 0352+309 (X Persei) [J].
Coburn, W ;
Heindl, WA ;
Grubert, DE ;
Rothschild, RE ;
Staubert, R ;
Wilms, J ;
Kreykenbohm, I .
ASTROPHYSICAL JOURNAL, 2001, 552 (02) :738-747
[8]   NEUTRON-STAR ACCRETION IN A STELLAR WIND - MODEL FOR A PULSED X-RAY SOURCE [J].
DAVIDSON, K ;
OSTRIKER, JP .
ASTROPHYSICAL JOURNAL, 1973, 179 (02) :585-598
[9]   SPINDOWN OF NEUTRON STARS IN CLOSE BINARY-SYSTEMS [J].
DAVIES, RE ;
FABIAN, AC ;
PRINGLE, JE .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1979, 186 (03) :779-782
[10]  
Delgado-Marti H., 2001, APJ, V546