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arXiv 1603.02461astro-ph.GA
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ASTRODEEP前沿场目录:II -Abell-2744和MACS-J0416中的测光红移和静止框架性质

The ASTRODEEP Frontier Fields Catalogues: II - Photometric redshifts and rest-frame properties in Abell-2744 and MACS-J0416

M. Castellano, R. Amorín, E. Merlin, A. Fontana, R. J. McLure, E. Mármol-Queraltó, A. Mortlock, S. Parsa, J. S. Dunlop, D. Elbaz, I. Balestra, A. Boucaud, N. Bo… 展开作者

M. Castellano, R. Amorín, E. Merlin, A. Fontana, R. J. McLure, E. Mármol-Queraltó, A. Mortlock, S. Parsa, J. S. Dunlop, D. Elbaz, I. Balestra, A. Boucaud, N. Bourne, K. Boutsia, G. Brammer, V. A. Bruce, F. Buitrago, P. Capak, N. Cappelluti, L. Ciesla, A. Comastri, F. Cullen, S. Derriere, S. M. Faber, E. Giallongo, A. Grazian, C. Grillo, A. Mercurio, M. J. Michałowski, M. Nonino, D. Paris, L. Pentericci, S. Pilo, P. Rosati, P. Santini, C. Schreiber, X. Shu, T. Wang

摘要:

我们提出了第一个公开发布的光度红移,星系静止框架的属性和相关的放大率值的集群和平行点的前两个前沿领域,阿贝尔-2744和MACS-J 0416。我们利用一个多波长的目录,从HST到地面的K和斯皮策IRAC,这是专门设计的,使拥挤的集群区域的准确通量的检测和测量。多波段的信息被用来推导光度红移和物理特性的来源,无论是在H波段图像单独或从一堆的四个WFC 3波段检测。为了尽量减少系统学中位数光度红移组装从六个不同的方法photo-z估计。通过与现有的光谱样品进行比较,评估其可靠性。最先进的透镜模型用于通过考虑源位置和红移来逐个对象地导出放大率值。我们表明,测光红移达到一个显着的~3-5%的精度。在考虑放大率后,H带的计数在亮星等处与CANDELS场的计数一致,同时将现有的样本扩展到由于强引力透镜而本质上像H 160 ~32-33这样微弱的星系。前沿场允许探测星系恒星质量分布在0.5-1.5 dex以下,取决于放大倍数,相对于河外宽场,包括源在M星~ 10^7-10^8 M太阳,z>5。类似地,它们允许检测具有内在SFR> Idex的物体,该内在SFR低于CANDELS场中的内在SFR,在z~6-10处达到0.1-1兆太阳/年。[删节]

英文摘要:

We present the first public release of photometric redshifts, galaxy rest-frame properties and associated magnification values in the cluster and parallel pointings of the first two Frontier Fields, Abell-2744 and MACS-J0416. We exploit a multi-wavelength catalogue ranging from HST to ground-based K and Spitzer IRAC which is specifically designed to enable detection and measurement of accurate fluxes in crowded cluster regions. The multi-band information is used to derive photometric redshifts and physical properties of sources detected either in the H-band image alone or from a stack of four WFC3 bands. To minimize systematics median photometric redshifts are assembled from six different approaches to photo-z estimates. Their reliability is assessed through a comparison with available spectroscopic samples. State of the art lensing models are used to derive magnification values on an object-by-object basis by taking into account sources positions and redshifts. We show that photometric redshifts reach a remarkable ~3-5% accuracy. After accounting for magnification the H band number counts are found in agreement at bright magnitudes with number counts from the CANDELS fields, while extending the presently available samples to galaxies intrinsically as faint as H160~32-33 thanks to strong gravitational lensing. The Frontier Fields allow to probe the galaxy stellar mass distribution at 0.5-1.5 dex lower masses, depending on magnification, with respect to extragalactic wide fields, including sources at Mstar~ 10^7-10^8 Msun at z>5. Similarly, they allow the detection of objects with intrinsic SFRs>1dex lower than in the CANDELS fields reaching 0.1-1 Msun/yr at z~6-10. [abridged]

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