arXiv 1104.41192011-04-20astro-ph.CO

由暗物质主导的前景星系群透镜的HERMES J105751 .1+573027亚毫米源的模拟

Modeling of the HERMES J105751.1+573027 submillimeter source lensed by a dark matter dominated foreground group of galaxies

R. Gavazzi, A. Cooray, A. Conley, J. E. Aguirre, A. Amblard, R. Auld, A. Beelen, A. Blain, R. Blundell, J. Bock, C. M. Bradford, C. Bridge, D. Brisbin, D. Burga… 展开作者

R. Gavazzi, A. Cooray, A. Conley, J. E. Aguirre, A. Amblard, R. Auld, A. Beelen, A. Blain, R. Blundell, J. Bock, C. M. Bradford, C. Bridge, D. Brisbin, D. Burgarella, P. Chanial, E. Chapin, N. Christopher, D. L. Clements, P. Cox, S. G. Djorgovski, C. D. Dowell, S. Eales, L. Earle, T. P. Ellsworth-Bowers, D. Farrah, A. Franceschini, H. Fu, J. Glenn, E. A. González Solares, M. Griffin, M. A. Gurwell, M. Halpern, E. Ibar, R. J. Ivison, M. Jarvis, J. Kamenetzky, S. Kim, M. Krips, L. Levenson, R. Lupu, A. Mahabal, P. D. Maloney, C. Maraston, L. Marchetti, G. Marsden, H. Matsuhara, A. M. J. Mortier, E. Murphy, B. J. Naylor, R. Neri, H. T. Nguyen, S. J. Oliver, A. Omont, M. J. Page, A. Papageorgiou, C. P. Pearson, I. Pérez-Fournon, M. Pohlen, N. Rangwala, J. I. Rawlings, G. Raymond, D. Riechers, G. Rodighiero, I. G. Roseboom, M. Rowan-Robinson, B. Schulz, Douglas Scott, K. S. Scott, P. Serra, N. Seymour, D. L. Shupe, A. J. Smith, M. Symeonidis, K. E. Tugwell, M. Vaccari, E. Valiante, I. Valtchanov, A. Verma, J. D. Vieira, L. Vigroux, L. Wang, J. Wardlow, D. Wiebe, G. Wright, C. K. Xu, G. Zeimann, M. Zemcov, J. Zmuidzinas

备注：: Submitted to ApJ
DOI：: 10.1088/0004-637X/738/2/125

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摘要：

我们提出了一个明亮的$\zs=2.957$亚毫米星系（SMG），HERMES J105751.1+573027的引力透镜分析的结果，发现在{ \it赫歇尔}/SPIRE科学演示阶段的数据从赫歇尔多层河外巡天（HerMES）项目。在光学和近红外通道中可用的高分辨率成像，以及用Plateau de Bure干涉仪获得的CO发射，使我们能够精确地估计固有源扩展，从而估计总透镜放大率为$μ=10.9\pm 0.7$。我们测量的半光半径$R_{\rm eff}$的源在休息帧近紫外线和$V$波段，其特征在于来自恒星的未被遮挡的光，并找到$R_{\rm eff,*}= [2.0 \pm 0.1]$ kpc，在很好的协议与最近的研究亚毫米星系人口。该透镜模型也被用来估计的气体分布（$R_{\rm eff,gas}= [1.1\pm0.5]$）kpc的大小映射回源平面的CO（J=5-4）过渡线发射。透镜建模产生相对大的爱因斯坦半径$R_{\rm Ein}= 4\farcs10 \pm 0\farcs02$，对应于[ $483\pm 16] \,\kms$]的偏转器速度色散。这表明HERMES J105751.1+573027被红移为$\zl\sim 0.6$的{ \it星系群大小}暗物质晕透镜化。投影的暗物质贡献在很大程度上主导了爱因斯坦半径内的质量预算与$f_{\rm dm}(<R_{\rm Ein})\sim 80%$。在恒星质量为$M_{\rm *,G1}=[8.5\pm 1.6] \times 10^{11}\msun$的主偏转星系的有效半径范围内，这一比例减少到$f_{\rm dm}(<R_{\rm eff,G1}\simeq 4.5\kpc)\sim 47%$。在这个较小的尺度上，暗物质的比例与SLACS巡天在$z\sim0.2$已经发现的大质量透镜椭圆星系的结果一致。

英文摘要：

We present the results of a gravitational lensing analysis of the bright $\zs=2.957$ sub-millimeter galaxy (SMG), HERMES J105751.1+573027 found in {\it Herschel}/SPIRE Science Demonstration Phase data from the Herschel Multi-tiered Extragalactic Survey (HerMES) project. The high resolution imaging available in optical and Near-IR channels, along with CO emission obtained with the Plateau de Bure Interferometer, allow us to precisely estimate the intrinsic source extension and hence estimate the total lensing magnification to be $μ=10.9\pm 0.7$. We measure the half-light radius $R_{\rm eff}$ of the source in the rest-frame Near-UV and $V$ bands that characterize the unobscured light coming from stars and find $R_{\rm eff,*}= [2.0 \pm 0.1]$ kpc, in good agreement with recent studies on the Submillimeter Galaxy population. This lens model is also used to estimate the size of the gas distribution ($R_{\rm eff,gas}= [1.1\pm0.5]$) kpc by mapping back in the source plane the CO (J=5-4) transition line emission. The lens modeling yields a relatively large Einstein radius $R_{\rm Ein}= 4\farcs10 \pm 0\farcs02$, corresponding to a deflector velocity dispersion of [$483\pm 16] \,\kms$. This shows that HERMES J105751.1+573027 is lensed by a {\it galaxy group-size} dark matter halo at redshift $\zl\sim 0.6$. The projected dark matter contribution largely dominates the mass budget within the Einstein radius with $f_{\rm dm}(<R_{\rm Ein})\sim 80%$. This fraction reduces to $f_{\rm dm}(<R_{\rm eff,G1}\simeq 4.5\kpc)\sim 47%$ within the effective radius of the main deflecting galaxy of stellar mass $M_{\rm *,G1}=[8.5\pm 1.6] \times 10^{11}\msun$. At this smaller scale the dark matter fraction is consistent with results already found for massive lensing ellipticals at $z\sim0.2$ from the SLACS survey.

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