Gravitational lensing effects on submillimetre galaxy counts

Gravitational lensing effects on submillimetre galaxy counts
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引力透镜对亚毫米星系计数的影响

DOI：
10.1093/mnras/stt012
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发表时间：
2013-01
期刊：
MNRAS
影响因子：
--
通讯作者：
尔欣中
尔欣中
中科院分区：
其他
文献类型：
--
作者：
尔欣中

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我们研究引力透镜效应对亚毫米星系计数的影响。我们探讨了光晕密度分布、椭圆率和宇宙学参数（功率谱归一化 sigma(8)）对放大截面的影响。我们表明，椭圆率不会强烈影响引力透镜中的放大截面，而光晕径向轮廓则会。由于星系中的重子冷却效应比星团中的重子冷却效应更强，因此星系晕更加集中。有鉴于此，我们探索了一种新的双晕群体模型场景，其中星系被建模为奇异的等温球体轮廓，星团被建模为纳瓦罗、弗伦克和怀特轮廓。我们发现两者之间的过渡质量对透镜概率的影响不大。宇宙学参数 sigma(8) 会改变晕的丰度，从而影响我们的结果。与其他方法相比，我们的模型更简单、更现实。先前工作的结论证实，引力透镜效应是亮端计数过剩的自然解释。
We study the effects on the number counts of submillimetre galaxies due to gravitational lensing. We explore the effects on the magnification cross-section due to halo density profiles, ellipticity and cosmological parameter (the power-spectrum normalization sigma(8)). We show that the ellipticity does not strongly affect the magnification cross-section in gravitational lensing while the halo radial profiles do. Since the baryonic cooling effect is stronger in galaxies than clusters, galactic haloes are more concentrated. In light of this, a new scenario of two-halo-population model is explored where galaxies are modelled as a singular isothermal sphere profile and clusters as a Navarro, Frenk and White profile. We find that the transition mass between the two has modest effects on the lensing probability. The cosmological parameter sigma(8) alters the abundance of haloes and therefore affects our results. Compared with other methods, our model is simpler and more realistic. The conclusions of previous works confirm that gravitational lensing is a natural explanation for the number count excess at the bright end.
EFFECTS OF STRONG GRAVITATIONAL LENSING ON MILLIMETER-WAVE GALAXY NUMBER COUNTS
DOI： 10.1088/0004-637x/734/1/52
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A distortion of very-high-redshift galaxy number counts by gravitational lensing
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