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

页码：2407 / 2413

页数：7

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