HerMES：亚毫米波段的候选引力透镜星系及透镜统计
宇宙学与河外天体物理
2015-06-05 v2 星系天体物理
摘要
我们提出了来自95平方度的Herschel多层河外星系巡天中的13个候选引力透镜亚毫米星系（SMGs）列表，面密度为0.14\pm0.04deg^{-2}。所选源的500um通量密度（S_500）大于100mJy。在13个系统中的9个（70%）中，后续观测证实了引力透镜效应，其余四个源的透镜状态尚未确定。我们还提出了一个包含29个（0.31\pm0.06deg^{-2}）引力透镜SMG候选源的补充样本，其S_500=80--100mJy，预计其中混入源的比例高于主候选样本。候选透镜星系的数计数与一个简单的透镜率统计模型一致，该模型使用了前景物质分布、内禀SMG数计数以及假定的SMG红移分布。该模型预测我们S_500>100mJy候选源中的32--74%被强引力透镜化（mu>2），其中最亮的源最为可靠；这与观测数据一致。我们的统计模型还预测，平均而言，S_500=100mJy的透镜星系被放大约9倍，由于内禀数计数的形状，表观更亮的星系具有逐渐更高的平均放大率。预计65%的源具有小于30mJy的内禀500micron通量密度。因此，像本文提出的强引力透镜SMG样本，探测了500 micron低于Herschel标称探测极限的范围。由于透镜放大效应，它们是详细研究遥远尘埃星暴星系物理条件的好目标，这可以在源平面实现约0.01"的空间分辨率。
引用
@article{arxiv.1205.3778,
title = {HerMES: Candidate Gravitationally Lensed Galaxies and Lensing Statistics at Submillimeter Wavelengths},
author = {Julie L. Wardlow and Asantha Cooray and Francesco De Bernardis and A. Amblard and V. Arumugam and H. Aussel and A. J. Baker and M. Béthermin and R. Blundell and J. Bock and A. Boselli and C. Bridge and V. Buat and D. Burgarella and R. S. Bussmann and A. Cabrera-Lavers and J. Calanog and J. M. Carpenter and C. M. Casey and N. Castro-Rodríguez and A. Cava and P. Chanial and E. Chapin and S. C. Chapman and D. L. Clements and A. Conley and P. Cox and C. D. Dowell and S. Dye and S. Eales and D. Farrah and P. Ferrero and A. Franceschini and D. T. Frayer and C. Frazer and Hai Fu and R. Gavazzi and J. Glenn and E. A. González Solares and M. Griffin and M. A. Gurwell and A. I. Harris and E. Hatziminaoglou and R. Hopwood and A. Hyde and E. Ibar and R. J. Ivison and S. Kim and G. Lagache and L. Levenson and L. Marchetti and G. Marsden and P. Martinez-Navajas and M. Negrello and R. Neri and H. T. Nguyen and B. O'Halloran and S. J. Oliver and A. Omont and M. J. Page and P. Panuzzo and A. Papageorgiou and C. P. Pearson and I. Pérez-Fournon and M. Pohlen and D. Riechers and D. Rigopoulou and I. G. Roseboom and M. Rowan-Robinson and B. Schulz and D. Scott and N. Scoville and N. Seymour and D. L. Shupe and A. J. Smith and A. Streblyanska and A. Strom and M. Symeonidis and M. Trichas and M. Vaccari and J. D. Vieira and M. Viero and L. Wang and C. K. Xu and L. Yan and M. Zemcov},
journal= {arXiv preprint arXiv:1205.3778},
year = {2015}
}
备注
ApJ in press. 31 pages, 16 figures, 5 tables. This version updated to match accepted version