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
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]
Hubble Frontier Field Photometric Catalogues of Abell 370 and RXC J2248.7-4431: Multiwavelength photometry, photometric redshifts, and stellar properties
The ALMA Frontier Fields Survey III: 1.1 mm Emission Line Identifications in Abell 2744, MACSJ0416.1-2403, MACSJ1149.5+2223, Abell 370, and Abell S1063
迄今为止,大多数对星系亚毫米发射线的研究都是针对具有已知红移的源,其中线的频率受到很好的限制。最近的盲线扫描规避了光谱红移的要求,这可能代表了选择偏差。我们的目标是检测连续谱定向观测中存在的发射线。这些谱线的探测提供了光谱红移和星系的性质。我们进行搜索的发射线在ALMA观测的五个前沿领域集群和评估我们的检测的可靠性,通过关联线候选人与检测到的星系在深近红外成像。我们发现26个显着的发射线候选人,与观测到的线通量之间的0.2-4.6 Jy km s $^{-1}$和速度色散(FWHM)的25-600 km s $^{-1}$。这些候选者中有九个位于近红外光源附近,提高了它们的可靠性;在六种情况下,观察到的线频率和强度与预期一致,因为光度红移和星系对应物的属性。我们提出了红移的鉴定,放大率和分子气体的估计与确定线的星系。我们发现,这些候选人中的两个可能起源于星暴星系,其中之一是水母星系,而另外两个是一致的主序星星系的基础上,在其耗尽时间。这项工作突出的程度,偶然发射线可以发现在大型镶嵌连续观测时,深辅助数据。然而,高显著性线检测的低数量证实了这样的调查不如盲线扫描那样最佳。我们强调,蒙特卡罗模拟应用来评估线检测的意义,因为使用负噪声遭受随机性和招致更大的不确定性。
The ALMA Frontier Fields Survey. VI. Lensing-corrected 1.1mm number counts in Abell 2744, MACSJ0416.1-2403, MACSJ1149.5+2223, Abell 370 and Abell S1063
本文利用 ALMA 对五个哈勃前沿场星系团的观测,通过统计透镜校正和蒙特卡洛模拟,推导出低至 0.01 mJy 的 1.1mm 计数,证实了计数平坦化趋势并支持其对应高红移红外光度函数拐点的解释。
The ALMA Frontier Fields Survey - II. Multiwavelength Photometric analysis of 1.1mm continuum sources in Abell 2744, MACSJ0416.1-2403 and MACSJ1149.5+2223
Hubble Frontier Fields : A High-Precision Strong-Lensing Mass Model of the Massive Galaxy Cluster Abell 2744 using 180 Multiple Images
我们提出了一个高精度的星系团阿贝尔2744的质量模型,强引力透镜分析的基础上的\emph{Hubble Space Telescope Frontier Fields}(HFF)的成像数据,现在包括两个\emph{Advanced Camera for Surveys}和\emph{Wide-Field Camera 3}观测到的最终深度。利用可见光和近红外数据前所未有的深度,我们确定了34个新的多重成像星系,使总数达到61个,包括181个单独的透镜图像。在这个过程中,我们纠正以前的错误识别和位置的集群核心的北部的多个系统。使用\textsc{Lenstool}软件和新的多组图像,我们使用两个星系团规模的暗物质晕和星系团成员的星系团规模的晕来模拟星系团。我们的最佳拟合模型预测图像的位置与\emph{RMS}的误差为0.69 $\arcsec$,这构成了一个改进的几乎是一个因素的两个在以前的参数模型,这个集群。我们测量了200 kpc口径内的总投影质量($2.162\pm 0.005$)$\times 10^{14}M_{\odot}$,从而继最近的HFF测量MACSJ 0416.1 -2403之后,第二次达到1级精度。重要的是,质量模型的更高质量转化为导出的放大因子的4倍的总体改进。%的高红移透镜背景星系。与我们以前的HFF引力透镜分析一起,这项工作表明,HFF数据能够对大质量星系…
The velocity dispersion function of red galaxies in four Hubble Frontier Fields galaxy clusters
Università degli Studi di Ferrara(费拉拉大学);Università degli Studi di Milano(米兰大学);University of Portsmouth(朴茨茅斯大学);Ludwig-Maximilians-Universität München(慕尼黑大学);INAF – IASF Milano(意大利国家天体物理研究所米兰天文物理研究所);INAF – OAS, Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(意大利国家天体物理研究所博洛尼亚天文与空间科学研究所);Università Degli Studi di Salerno(萨莱诺大学);INAF – Osservatorio Astronomico di Capodimonte(意大利国家天体物理研究所卡波迪蒙特天文台)