SPECTRAL ANALYSIS IN ORBITAL/SUPERORBITAL PHASE SPACE AND HINTS OF SUPERORBITAL VARIABILITY IN THE HARD X-RAYS OF LS I+61°303

被引：12

作者：

Li, Jian ^{[1
]}

Torres, Diego F. ^{[1
,2
]}

Zhang, Shu ^{[3
]}

机构：

[1] Inst Space Sci IEEC CSIC, E-08193 Barcelona, Spain

[2] ICREA, E-08010 Barcelona, Spain

[3] Inst High Energy Phys, Lab Particle Astrophys, Beijing 100049, Peoples R China

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2014年 / 785卷 / 01期

关键词：

methods: observational; X-rays: binaries; X-rays: individual (LS I+61 degrees 303); NEUTRON-STAR; EMISSION; BINARIES; OUTBURSTS; STATES; MODEL;

D O I：

10.1088/2041-8205/785/1/L19

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an INTEGRAL spectral analysis in the orbital/superorbital phase space of LS I +61 degrees 303. A hard X-ray spectrum with no cutoff is observed at all orbital/superorbital phases. The hard X-ray index is found to be uncorrelated with the radio index (non-simultaneously) measured at the same orbital and superorbital phases. In particular, the absence of an X-ray spectrum softening during periods of negative radio index does not favor a simple interpretation of the radio index variations in terms of a microquasar's changes of state. We uncover hints of superorbital variability in the hard X-ray flux, in phase with the superorbital modulation in soft X-rays. An orbital phase drift of the radio peak flux and index along the superorbital period is observed in the radio data. We explore its influence on a previously reported double-peak structure of a radio orbital light curve, and present it as a plausible explanation.

引用

页数：6

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