Flat Power Spectra of Ultraluminous X-ray Sources: Evidence of Super-Eddington Accretion

被引：0
|
作者：
Atapin, K. [1 ,2 ]
Fabrika, S. [2 ]
机构：
[1] Lomonosov Moscow State Univ, Sternberg Astron Inst, Moscow, Russia
[2] Russian Acad Sci, Sternberg Astron Inst, Nizhnii Arkhyz, Russia
来源：
STARS: FROM COLLAPSE TO COLLAPSE | 2017年 / 510卷
基金：
俄罗斯基础研究基金会; 俄罗斯科学基金会;
关键词：
SUPERCRITICAL ACCRETION; BLACK-HOLES; SS; 433;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We analyze a stochastic X-ray variability of ultraluminous X-ray sources (ULXs) using a sample of 12 objects. Recently, we have found that the power spectrum of SS 433 can be fitted by the broken power law with a flat spectrum between 10(-5) and 10(-3) Hz. Similar flat power spectra are shown in ultraluminous X-ray sources NGC 5408 X-1, NGC 6946 X-1, and M82 X-1. These objects also have quasi-periodic oscillations (QPO) near 0.01 Hz. We suppose that such a type of variability may be related to the structure of supercritical disk and they may represent an evidence of supercritical accretion in these sources.
引用
收藏
页码：478 / 479
页数：2
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