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arXiv 1107.2244astro-ph.GAastro-ph.CO
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附近黑洞候选者的目录

The catalog of nearby black hole candidates

Laurentiu I. Caramete, Peter L. Biermann

摘要:

上下文为了研究超高能宇宙射线(UHECR)的起源与活动星系核(AGN)在各个活动水平上的关系,我们需要一个无偏的黑洞样本。目标。在这里,我们描述这样一个样本,约6000个黑洞,在本地宇宙中,在GZK(Greisen Zatsepin Kuzmin)极限内,约100 Mpc。方法.起点是2微米全天巡天,下一步是:测试它的完整性低通量密度,限制它的红移z < 0.025,限制它的早期哈勃型星系,测试与B-V颜色和FIR/射电比的超高能宇宙射线源的可能的分类,利用球状恒星分量与黑洞质量的关系推导出黑洞质量,并用已知的黑洞质量检验它们。结果这些统计数据与黑洞质量的质量函数相一致,在10^8 Msol左右的范围内,黑洞质量的分布相对平坦,此后的光谱非常陡峭。我们的样本在10^7 Msol以下截断,表明在10^6 Msol附近的某个地方存在较低质量的间隙。我们构造了所有大于10^7 Msol、10^8 Msol和3 x 10^8 Msol的黑洞的天空分布,并给出了红移范围为0.0 - 0.005、0.005 - 0.0010、0.010 - 0.015、0.015 - 0.020和0.020 - 0.025的天空分布。

英文摘要:

Context. In order to study the association of the origin of ultra high energy cosmic rays (UHECR) with active galactic nuclei (AGN) at all levels of their activity we require an unbiased sample of black holes. Aims. Here we describe such a sample, of about 6 000 black holes, within the local Universe, inside the GZK (Greisen Zatsepin Kuzmin) limit, around 100 Mpc. Methods. The starting point is the 2 micron all sky survey, with the next steps as: test its com- pleteness down to low flux densities, confine it to redshifts z < 0.025, limit it to early Hubble type galaxies, test with B-V colors and with the FIR/Radio ratio the possible separation in classes of sources for the ultra high energy cosmic rays, use the spheroidal stellar component - black hole mass relationship to derive black hole masses, and test them with known black hole masses. Results. The statistics are consistent with the mass function of black hole masses, with a rel- atively flat distribution to about 10^8 Msol, and thereafter a very steep spectrum. Our sample cuts off just below 10^7 Msol, indicating a gap for lower masses, below somewhere near 10^6 Msol. We construct the sky distribution for all black holes above 10^7 Msol, 10^8 Msol, and 3 x 10^8 Msol, and also show the sky distribution for the five redshift ranges 0.0 - 0.005, 0.005 - 0.0010, 0.010 - 0.015, 0.015 - 0.020, and 0.020 to 0.025.

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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