scholarly journals Mass dependent Evolution of Field Early-Type Galaxies Since z=1

2009 ◽  
Vol 5 (S262) ◽  
pp. 335-336
Author(s):  
Alexander Fritz ◽  
Inger Jørgensen ◽  
Ricardo P. Schiavon
Keyword(s):  
High Redshift ◽  
Galaxy Cluster ◽  
Early Type ◽  
Data Set ◽  
Redshift Galaxy ◽  
Slope Change ◽  
Formation And Evolution ◽  
Distant Field ◽  
Mass Dependent ◽  
Homogeneous Data

AbstractWe present the Fundamental Plane (FP) of field early-type galaxies at 0.5 < z < 1.0. Our project is a continuation of our efforts to understand the formation and evolution of early-type galaxies in different environments. The target galaxies were selected from the comprehensive and homogeneous data set of the Gemini/HST Galaxy Cluster Project. The distant field early-type galaxies follow a steeper FP relation compared to the local FP. The change in the slope of the FP can be interpreted as a mass-dependent evolution. Similar results have been found for cluster early-type galaxies in high redshift galaxy clusters at 0.8 < z <1. Therefore, the slope change of the FP appears to be independent of the environment of the galaxies.

scholarly journals More connected, more active: galaxy clusters and groups at z ∼ 1 and the connection between their quiescent galaxy fractions and large-scale environments

2019 ◽  
Vol 490 (1) ◽  
pp. 135-155 ◽  
Author(s):  
Seong-Kook Lee ◽  
Myungshin Im ◽  
Minhee Hyun ◽  
Bomi Park ◽  
Jae-Woo Kim ◽  
...  
Keyword(s):  
Star Formation ◽  
Galaxy Clusters ◽  
Large Scale ◽  
High Redshift ◽  
Galaxy Cluster ◽  
Spectroscopic Observation ◽  
Star Forming ◽  
Large Scale Structures ◽  
Photometric Redshift ◽  
Redshift Galaxy

ABSTRACT High-redshift galaxy clusters, unlike local counterparts, show diverse star formation activities. However, it is still unclear what keeps some of the high-redshift clusters active in star formation. To address this issue, we performed a multiobject spectroscopic observation of 226 high-redshift (0.8 < z < 1.3) galaxies in galaxy cluster candidates and the areas surrounding them. Our spectroscopic observation reveals six to eight clusters/groups at z ∼ 0.9 and z ∼ 1.3. The redshift measurements demonstrate the reliability of our photometric redshift measurements, which in turn gives credibility for using photometric redshift members for the analysis of large-scale structures (LSSs). Our investigation of the large-scale environment (∼10 Mpc) surrounding each galaxy cluster reveals LSSs – structures up to ∼10 Mpc scale – around many of, but not all, the confirmed overdensities and the cluster candidates. We investigate the correlation between quiescent galaxy fraction of galaxy overdensities and their surrounding LSSs, with a larger sample of ∼20 overdensities including photometrically selected overdensities at 0.6 < z < 0.9. Interestingly, galaxy overdensities embedded within these extended LSSs show a lower fraction of quiescent galaxies ($\sim 20{{\ \rm per\ cent}}$) than isolated ones at similar redshifts (with a quiescent galaxy fraction of $\sim 50 {{\ \rm per\ cent}}$). Furthermore, we find a possible indication that clusters/groups with a high quiescent galaxy fraction are more centrally concentrated. Based on these results, we suggest that LSSs are the main reservoirs of gas and star-forming galaxies to keep galaxy clusters fresh and extended in size at z ∼ 1.

scholarly journals XMM-Newtonobservations of the relaxed, high-redshift galaxy cluster ClJ0046.3+8530 atz= 0.62

2004 ◽  
Vol 354 (1) ◽  
pp. 1-9 ◽  
Author(s):  
B. J. Maughan ◽  
L. R. Jones ◽  
D. Lumb ◽  
H. Ebeling ◽  
P. Gondoin
Keyword(s):  
High Redshift ◽  
Galaxy Cluster ◽  
Redshift Galaxy

scholarly journals Precise weak lensing constraints from deep high-resolution Ks images: VLT/HAWK-I analysis of the super-massive galaxy cluster RCS2 J 232727.7−020437 at z = 0.70

2018 ◽  
Vol 610 ◽  
pp. A85 ◽  
Author(s):  
Tim Schrabback ◽  
Mischa Schirmer ◽  
Remco F. J. van der Burg ◽  
Henk Hoekstra ◽  
Axel Buddendiek ◽  
...  
Keyword(s):  
Galaxy Clusters ◽  
High Redshift ◽  
Galaxy Cluster ◽  
Weak Lensing ◽  
Data Sets ◽  
Redshift Distribution ◽  
Model And Simulation ◽  
Single Orbit ◽  
Redshift Galaxy ◽  
Massive Galaxy

We demonstrate that deep good-seeing VLT/HAWK-I Ks images complemented with g + z-band photometry can yield a sensitivity for weak lensing studies of massive galaxy clusters at redshifts 0.7 ≲ z ≲ 1.1, which is almost identical to the sensitivity of HST/ACS mosaics of single-orbit depth. Key reasons for this good performance are the excellent image quality frequently achievable for Ks imaging from the ground, a highly effective photometric selection of background galaxies, and a galaxy ellipticity dispersion that is noticeably lower than for optically observed high-redshift galaxy samples. Incorporating results from the 3D-HST and UltraVISTA surveys we also obtained a more accurate calibration of the source redshift distribution than previously achieved for similar optical weak lensing data sets. Here we studied the extremely massive galaxy cluster RCS2 J232727.7−020437 (z = 0.699), combining deep VLT/HAWK-I Ks images (point spread function with a 0.′′35 full width at half maximum) with LBT/LBC photometry. The resulting weak lensing mass reconstruction suggests that the cluster consists of a single overdensity, which is detected with a peak significance of 10.1σ. We constrained the cluster mass to M200c/(1015 M⊙) = 2.06−0.26+0.28(stat.) ± 0.12(sys.) assuming a spherical Navarro, Frenk & White model and simulation-based priors on the concentration, making it one of the most massive galaxy clusters known in the z ≳ 0.7 Universe. We also cross-checked the HAWK-I measurements through an analysis of overlapping HST/ACS images, yielding fully consistent estimates of the lensing signal.

scholarly journals Constraints on the [C ii] luminosity of a proto-globular cluster at z ∼ 6 obtained with ALMA

2020 ◽  
Vol 500 (3) ◽  
pp. 3083-3094
Author(s):  
Francesco Calura ◽  
Eros Vanzella ◽  
Stefano Carniani ◽  
Roberto Gilli ◽  
Piero Rosati ◽  
...  
Keyword(s):  
Globular Cluster ◽  
High Redshift ◽  
Formation Rate ◽  
Galaxy Cluster ◽  
Careful Analysis ◽  
Data Set ◽  
Limit Values ◽  
Stellar Feedback ◽  
Neutral Gas ◽  
The Galaxy

ABSTRACT We report on ALMA observations of D1, a system at z ∼ 6.15 with stellar mass $M_{*} \sim 10^7 \, \mathrm{M}_{\odot }$ containing globular cluster (GC) precursors, strongly magnified by the galaxy cluster MACS J0416.1-2403. Since the discovery of GC progenitors at high redshift, ours is the first attempt to probe directly the physical properties of their neutral gas through infrared observations. A careful analysis of our data set, performed with a suitable procedure designed to identify faint narrow lines and which can test various possible values for the unknown linewidth value, allowed us to identify a 4σ tentative detection of [C ii] emission with intrinsic luminosity $L_{\rm [C\, \rm {\small II}]}=(2.9 \pm 1.4)~10^6 \, {\it L}_{\odot }$, one of the lowest values ever detected at high redshift. This study offers a first insight on previously uncharted regions of the $L_{\rm [C\, \rm {\small II}]}{-}{\rm SFR}$ relation. Despite large uncertainties affecting our measure of the star formation rate, if taken at face value our estimate lies more than ∼1 dex below the values observed in local and high redshift systems. Our weak detection indicates a deficiency of [C ii] emission, possibly ascribed to various explanations, such as a low-density gas and/or a strong radiation field caused by intense stellar feedback, and a low metal content. From the non-detection in the continuum, we derive constraints on the dust mass, with 3σ upper limit values as low as ∼ a few 104 M⊙, consistent with the values measured in local metal-poor galaxies.

scholarly journals Free-form Lens Model and Mass Estimation of the High-redshift Galaxy Cluster ACT-CL J0102-4915, “El Gordo”

2020 ◽  
Vol 904 (2) ◽  
pp. 106
Author(s):  
Jose M. Diego ◽  
S. M. Molnar ◽  
C. Cerny ◽  
T. Broadhurst ◽  
R. Windhorst ◽  
...  
Keyword(s):  
High Redshift ◽  
Galaxy Cluster ◽  
Free Form ◽  
Lens Model ◽  
Mass Estimation ◽  
Redshift Galaxy

scholarly journals Methods for identifying high‐redshift galaxy cluster candidates

2019 ◽  
Vol 340 (7) ◽  
pp. 618-621
Author(s):  
Sandor Pinter ◽  
Lajos G. Balázs ◽  
Zsolt Bagoly ◽  
Istvan Horvath ◽  
István I. Rácz ◽  
...  
Keyword(s):  
High Redshift ◽  
Galaxy Cluster ◽  
Redshift Galaxy

scholarly journals Deep XMM–Newton observations of the most distant SPT-SZ galaxy cluster

2020 ◽  
Vol 496 (2) ◽  
pp. 1554-1564 ◽  
Author(s):  
Adam B Mantz ◽  
Steven W Allen ◽  
R Glenn Morris ◽  
Rebecca E A Canning ◽  
Matthew Bayliss ◽  
...  
Keyword(s):  
High Redshift ◽  
Cluster Formation ◽  
Weighted Average ◽  
Galaxy Cluster ◽  
Data Set ◽  
Cluster Emission ◽  
Distant Cluster ◽  
Average Temperature ◽  
South Pole Telescope ◽  
Sunyaev Zel'dovich Effect

ABSTRACT We present results from a 577 ks XMM–Newton observation of SPT-CL J0459–4947, the most distant cluster detected in the South Pole Telescope 2500 square degree (SPT-SZ) survey, and currently the most distant cluster discovered through its Sunyaev–Zel’dovich effect. The data confirm the cluster’s high redshift, z = 1.71 ± 0.02, in agreement with earlier, less precise optical/IR photometric estimates. From the gas density profile, we estimate a characteristic mass of $M_{500}=(1.8\pm 0.2)\times 10^{14}\, {\rm M}_{\odot }$; cluster emission is detected above the background to a radius of $\sim \!2.2\, r_{500}$, or approximately the virial radius. The intracluster gas is characterized by an emission-weighted average temperature of 7.2 ± 0.3 keV and metallicity with respect to Solar of $Z/\, Z_{\odot }=0.37\pm 0.08$. For the first time at such high redshift, this deep data set provides a measurement of metallicity outside the cluster centre; at radii $r\gt 0.3\, r_{500}$, we find $Z/\, Z_{\odot }=0.33\pm 0.17$ in good agreement with precise measurements at similar radii in the most nearby clusters, supporting an early enrichment scenario in which the bulk of the cluster gas is enriched to a universal metallicity prior to cluster formation, with little to no evolution thereafter. The leverage provided by the high redshift of this cluster tightens by a factor of 2 constraints on evolving metallicity models, when combined with previous measurements at lower redshifts.

scholarly journals Shape, Color, and Distance in Weak Gravitational Flexion

2020 ◽  
Author(s):  
Joseph M Fabritius ◽  
Evan J Arena ◽  
David M Goldberg
Keyword(s):  
Gravitational Lensing ◽  
Rotational Symmetry ◽  
High Redshift ◽  
Morphological Type ◽  
Elliptical Galaxies ◽  
Early Type ◽  
Late Type ◽  
Color Measurements ◽  
Redshift Galaxy ◽  
Intrinsic Scatter

Abstract Canonically, elliptical galaxies might be expected to have a perfect rotational symmetry, making them ideal targets for flexion studies - however, this assumption hasn’t been tested. We have undertaken an analysis of low and high redshift galaxy catalogs of known morphological type with a new gravitational lensing code, Lenser. Using color measurements in the u − r bands and fit Sérsic index values, objects with characteristics consistent with early-type galaxies are found to have a lower intrinsic scatter in flexion signal than late-type galaxies. We find this measured flexion noise can be reduced by more than a factor of two at both low and high redshift.

scholarly journals LOFAR Discovery of a Radio Halo in the High-redshift Galaxy Cluster PSZ2 G099.86+58.45

2019 ◽  
Vol 881 (1) ◽  
pp. L18 ◽  
Author(s):  
R. Cassano ◽  
A. Botteon ◽  
G. Di Gennaro ◽  
G. Brunetti ◽  
M. Sereno ◽  
...  
Keyword(s):  
High Redshift ◽  
Galaxy Cluster ◽  
Radio Halo ◽  
Redshift Galaxy
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