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arXiv 0907.2308astro-ph.CO
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在射电和亚毫米波段亚毫米星系产生的引力弧的丰度

On the abundance of gravitational arcs produced by submillimeter galaxies at radio and submm wavelengths

C. Fedeli, A. Berciano Alba

摘要:

我们预测了由前景星系团透镜作用的亚毫米星系(SMG)产生的巨大引力弧的丰度,无论是在无线电和亚毫米波长。的星系团人口建模在一个现实的方式与使用半解析合并树,而个人偏转器的密度分布考虑到椭圆率和子结构。SMG的无线电和亚毫米发射区的典型尺寸是基于当前的无线电/CO观测和FIR无线电相关性。源的红移分布已被建模使用三个不同的功能(基于光谱/光度红移测量和一个简单的进化模型),以量化的高红移尾巴上的弧数的影响。源数量计数与当前可用的观测结果兼容,并适当扭曲以考虑透镜放大率偏差。我们提出的表格和绘图的无线电和亚毫米弧产生的SMG作为表面亮度的函数,用于规划未来的调查,旨在弧统计研究。他们表明,例如,以至少5的信噪比在整个天空上检测几百个亚毫米弧需要在$850 μ$ m处的1毫焦角秒$^{-2}$的灵敏度。在1.4 GHz下,当表面亮度阈值为$20 μ$/y arcsec $^{-2}$时,在相同的信噪比下,应该检测到大约相同数量的射电弧。这些结果与以前的工作在文献中发现的比较也进行了讨论。

英文摘要:

We predict the abundance of giant gravitational arcs produced by submillimeter galaxies (SMGs) lensed by foreground galaxy clusters, both at radio and submm wavelengths. The galaxy cluster population is modeled in a realistic way with the use of semi-analytic merger trees, while the density profiles of individual deflectors take into account ellipticity and substructures. The adopted typical size of the radio and submm emitting regions of SMGs is based on current radio/CO observations and the FIR-radio correlation. The source redshift distribution has been modeled using three different functions (based on spectroscopic/photometric redshift measurements and a simple evolutionary model) to quantify the effect of a high redshift tail on the number of arcs. The source number counts are compatible with currently available observations, and were suitably distorted to take into account the lensing magnification bias. We present tables and plots for the numbers of radio and submm arcs produced by SMGs as a function of surface brightness, useful for the planning of future surveys aimed at arc statistics studies. They show that e.g., the detection of several hundred submm arcs on the whole sky with a signal-to-noise ratio of at least 5 requires a sensitivity of 1 mJy arcsec$^{-2}$ at $850 μ$m. Approximately the same number of radio arcs should be detected with the same signal-to-noise ratio with a surface brightness threshold of $20 μ$Jy arcsec$^{-2}$ at 1.4 GHz. Comparisons of these results with previous work found in the literature are also discussed.

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