Broad-band observations of the Be/X-ray binary pulsar RX J0440.9+4431: discovery of a cyclotron absorption line

被引：51
作者：
Tsygankov, S. S. [1 ,2 ,3 ,4 ]
Krivonos, R. A. [3 ,4 ]
Lutovinov, A. A. [2 ,4 ]
机构：
[1] Univ Turku, Finnish Ctr Astron ESO FINCA, FI-21500 Piikkio, Finland
[2] Univ Oulu, Astron Div, Dept Phys, FI-90014 Oulu, Finland
[3] MPI Astrophys, D-85741 Garching, Germany
[4] Russian Acad Sci, Space Res Inst, Moscow 117997, Russia
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2012年 / 421卷 / 03期
基金：
俄罗斯基础研究基金会; 芬兰科学院;
关键词：
pulsars: individual: RX J0440.9+4431; X-ray: binaries; MAGNETIC-FIELDS; TIMING-EXPLORER; INTEGRAL DATA; VARIABILITY; MISSION; LUMINOSITY; STARS;
D O I：
10.1111/j.1365-2966.2012.20475.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report the results of an analysis of data obtained with the International Gamma-Ray Astrophysics Laboratory (INTEGRAL), Swift and Rossi X-ray Timing Explorer (RXTE) observatories during the 2010 April and September outbursts of the X-ray pulsar RX J0440.9+4431. The temporal and spectral properties of the pulsar in a wide energy band (0.6120 keV) were studied for the first time. We discovered a 32-keV cyclotron resonant scattering feature in the source spectrum that allowed us to estimate the magnetic field strength of the neutron star as B? 3.2 x 10(12) G. The estimate of the magnetic field strength was confirmed by a comprehensive analysis of the noise power spectrum of the source. Based on the recurrence time between Type I outbursts, the orbital period of the binary system can be estimated as 155 d. We have shown that the pulse profile has a sinusoidal-like single-peaked shape and has practically no dependence on the source luminosity or energy band.
引用
收藏
页码：2407 / 2413
页数：7
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