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arXiv 1005.0249astro-ph.HE
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INTEGRAL探测的可变源目录I:目录和技术

The catalog of variable sources detected by INTEGRAL I: Catalog and Techniques

I. Telezhinsky, D. Eckert, V. Savchenko, A. Neronov, N. Produit, T. J. -L. Courvoisier

摘要:

背景:在6年的运作中,INTEGRAL/ISGRI揭示了500多个来源。其中许多来源是可变的。考虑到近一半的INTEGRAL/ISGRI源是新的,其中许多仍然是未知的,源的可变性特性可以作为额外的参数,可能有助于分类和识别未知的源。目的:为了研究INTEGRAL/ISGRI探测到的源的变异性,我们开发了一种方法来量化源的变异性。我们在这里描述我们的技术,并编制一个目录的来源,符合我们的标准的变化。研究方法:我们使用自然时间分仓的INTEGRAL观测称为科学窗口($\approx 2000$秒)和测试的假设,检测到的源是恒定的使用$χ^2$全天地图在三个能量波段(20-40,40-100,100-200千电子伏)。我们计算一个内在的方差的通量在个别像素,并使用它来定义一个源的分数变化。该方法对一个科学窗口及更高时间尺度上的源变率敏感。我们只集中在已经报告被INTEGRAL检测到的源上。结果:我们提出了一个目录的202个来源,发现是显着的变化。对于目录源,我们给出了在20-40,40-100,100-200 keV的能量带的可变性和通量与相应的误差的措施,我们提出了一些统计的可变源的人口。在即将发表的论文中将给出可变源的物理性质的描述。

英文摘要:

Context: In 6 years of operation, INTEGRAL/ISGRI revealed more than 500 sources. Many of these sources are variable. Taking into account that nearly half of INTEGRAL/ISGRI sources are new and many of them are still unidentified, the variability properties of the sources can serve as additional parameters that may help to classify and identify the unknown sources. Aims: In order to study the variability properties of the sources detected by INTEGRAL/ISGRI we develop a method to quantify the variability of a source. We describe here our techniques and compile a catalog of the sources that fit our criteria of variability. Methods: We use the natural time binning of INTEGRAL observations called Science Window ($\approx 2000$ seconds) and test the hypothesis that the detected sources are constant using a $χ^2$ all-sky map in three energy bands (20-40, 40-100, 100-200 keV). We calculate an intrinsic variance of the flux in individual pixels and use it to define the fractional variability of a source. The method is sensitive to the source variability on time scales of one Science Window and higher. We concentrate only on the sources which were already reported to be detected by INTEGRAL. Results: We present a catalog of 202 sources which are found to be significantly variable. For the catalog sources we give the measure of variability and fluxes with corresponding errors in 20-40, 40-100, 100-200 keV energy bands, and we present some statistics about the population of variable sources. The description of the physical properties of the variable sources will be given in a forthcoming paper.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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