Strong lensing analysis of Abell 2744 with MUSE and Hubble Frontier Fields images
G. Mahler, J. Richard, B. Clément, D. Lagattuta, K. Schmidt, V. Patrício, G. Soucail, R. Bacon, R. Pello, R. Bouwens, M. Maseda, J. Martinez, M. Carollo, H. Ina… 展开作者
G. Mahler, J. Richard, B. Clément, D. Lagattuta, K. Schmidt, V. Patrício, G. Soucail, R. Bacon, R. Pello, R. Bouwens, M. Maseda, J. Martinez, M. Carollo, H. Inami, F. Leclercq, L. Wisotzki
We present an analysis of MUSE observations obtained on the massive Frontier Fields cluster Abell 2744. This new dataset covers the entire multiply-imaged region around the cluster core. We measure spectroscopic redshifts for HST-selected continuum sources together with line emitters blindly detected in the datacube. The combined catalog consists of 514 spectroscopic redshifts (with 414 new identifications), including 156 cluster members and 326 magnified background sources. We use this redshift information to perform a strong-lensing analysis of all multiple images previously found in the deep Frontier Field images, and add three new MUSE-detected multiply-imaged systems with no obvious HST counterpart. The combined strong lensing constraints include a total of 60 systems producing 188 images altogether, out of which 29 systems and 83 images are spectroscopically confirmed, making Abell 2744 one of the most well-constrained clusters to date. A parametric mass model including two cluster-scale components in the core and several group-scale substructures at larger radii accurately reproduces all the spectroscopic multiple systems, reaching an rms of 0.67" in the image plane. Overall, the large number of spectroscopic redshifts gives us a robust model and we estimate the systematics on the mass density and magnification within the cluster core to be typically ~9%.
Ram pressure stripping has been proven to be effective in shaping galaxy properties in dense environments at low redshift. The availability of MUSE observations of a sample of distant (z$\sim 0.3-0.5$) clusters has allowed to search for galaxies subject to this phenomenon at significant lookback times. In this paper we describe how we discovered and characterized 13 ram-pressure stripped galaxies in the central regions of two intermediate redshift (z$\sim$0.3-0.4) clusters, A2744 and A370, using the MUSE spectrograph. Emission line properties as well as stellar features have been analyzed to i…
We analyzed the contribution of the intracluster light (ICL) to the total luminosity of two massive galaxy clusters observed by the Hubble Space Telescope within the Frontier Fields program, Abell 370 (z ~ 0.375) and Abell S1063 (z ~ 0.348), in order to correlate it with the dynamical stage of these systems.We applied an algorithm based on the Chebyshev-Fourier functions called CICLE, specially developed to disentangle the ICL from the light of galaxies and measure the ICL fraction. We measured the ICL fraction in three broadband optical filters, F435W, F606W, and F814W, without assuming any p…
We investigate the strong-lensing cluster Abell 370 (A370) using a wide Integral Field Unit (IFU) spectroscopic mosaic from the Multi-Unit Spectroscopic Explorer (MUSE). IFU spectroscopy provides significant insight into the structure and mass content of galaxy clusters, yet IFU-based cluster studies focus almost exclusively on the central Einstein-radius region. Covering over 14 arcmin$^2$, the new MUSE mosaic extends significantly beyond the A370 Einstein radius, providing, for the first time, a detailed look at the cluster outskirts. Combining these data with wide-field, multi-band Hubble S…
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 Hubble Frontier Fields (HFF) are a selection of well-studied galaxy clusters used to probe dense environments and distant gravitationally lensed galaxies. We explore the 21cm neutral hydrogen (HI) content of galaxies in three of the HFF clusters, Abell 2744 ($z = 0.308$), Abell S1063 ($z = 0.346$) and Abell 370 ($z = 0.375$), to investigate the evolution of gas in galaxies within intermediate redshift clusters. Using Early Science MeerKAT observations, we perform spectral-line stacking with HI cubes and make a 3$σ$ stacked detection for blue galaxies in Abell S1063 ($M_\mathrm{HI} = 1.22^{…
Ultra-diffuse and Ultra-compact Galaxies in the Frontier Fields Cluster Abell 2744
我们报道了哈勃前沿场计划在大质量星系团Abell 2744(z=0.308)中发现的大量超弥散星系团(UDG)。由于这个星系团的质量是Coma的5倍,我们的观测使我们能够将0.7 dex扩展到van der Burg等人2016年报告的UDG丰度和星系团质量之间关系的高质量端。使用与van der Burg et al. 2016相同的选择标准,A2744估计有2133 +/- 613个UDG,是Coma的10倍。正如Lee & Jang 2016所指出的,A2744包含许多未解析的致密天体,这些作者主要将其确定为球状星团。然而,这些天体的光度与超紧凑矮星系(UCD)更一致。UCD和UDG的丰度与集群质量成幂律关系,具有相似的指数,尽管UDG和UCD在集群内的径向分布非常不同。UCD的径向面密度分布向星团中心急剧上升,而UDG的面密度分布基本平坦。总之,这些观察结果暗示了一种情况,即A2744中的一些UCD可能曾经与下落的UDG有关。当UDG落入并溶解时,它们留下了未结合的超紧凑矮星的残余物。
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. 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 VLA Frontier Fields Survey: A 6GHz High-resolution Radio Survey of Abell2744
Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México(墨西哥国立自治大学无线电天文学与天体物理研究所);Observatorio Astronómico de Quito, Escuela Politécnica Nacional(基多天文台,国立理工学院);National Radio Astronomy Observatory(国家射电天文台);Centre for Extragalactic Astronomy, Department of Physics, Durham University(杜伦大学物理系河外天文中心);Astrophysics, Department of Physics, University of Oxford(牛津大学物理系天体物理学)
Context: A census of faint and tiny star forming complexes at high redshift is key to improving our understanding of reionizing sources, galaxy growth and the formation of globular clusters. Aims: We present the MUSE Deep Lensed Field (MDLF) program. Methods: We describe Deep MUSE observations of 17.1 hours integration on a single pointing over the Hubble Frontier Field galaxy cluster MACS~J0416. Results: We confirm spectroscopic redshifts for all 136 multiple images of 48 source galaxies at 0.9<z<6.2. Within those galaxies, we securely identify 182 multiple images of 66 galaxy components that…
We present results from \textit{Chandra} X-ray observations and 325 MHz Giant Metrewave Radio Telescope (GMRT) observations of the massive and X-ray luminous cluster of galaxies Abell S1063. We report the detection of large-scale \lq\lq excess brightness\rq\rq\ in the residual \textit{Chandra} X-ray surface brightness map, which extends at least 2.7 Mpc towards the north-east from the center of the cluster. We also present a high fidelity X-ray flux and temperature map using \textit{Chandra} archival data of 122 ksec, which shows the disturbed morphology in the cluster. The residual flux map s…
We study the dynamics of Abell 370 (A370), a highly massive Hubble Frontier Fields galaxy cluster, using self-consistent three-dimensional N-body/hydrodynamical simulations. Our simulations are constrained by X-ray, optical spectroscopic and gravitational lensing, and Sunyaev-Zel'dovich (SZ) effect observations. Analyzing archival Chandra observations of A370 and comparing the X-ray morphology to the latest gravitational lensing mass reconstruction, we find offsets of ~30 kpc and ~100 kpc between the two X-ray surface brightness peaks and their nearest mass surface density peaks, suggesting th…
The Grism Lens-Amplified Survey from Space (GLASS). IV. Mass reconstruction of the lensing cluster Abell 2744 from frontier field imaging and GLASS spectroscopy
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 ALMA Frontier Fields Survey - II. Multiwavelength Photometric analysis of 1.1mm continuum sources in Abell 2744, MACSJ0416.1-2403 and MACSJ1149.5+2223
We present a detailed weak-lensing and X-ray study of the Frontier Fields galaxy cluster Abell 370, one of the most massive known lenses on the sky, using wide-field BRz Subaru/Sprime-Cam and Chandra X-ray observations. By combining two-dimensional (2D) shear and azimuthally averaged magnification constraints derived from Subaru data, we perform a lensing mass reconstruction in a free-form manner, which allows us to determine both radial structure and 2D morphology of the cluster mass distribution. In a triaxial framework assuming a Navarro-Frenk-White density profile, we constrain the intrins…