The 2dF galaxy redshift survey: The blue galaxy fraction and implications for the Butcher-Oemler effect by De Propris, R, Colless, M, Peacock, J, Couch, W, Driver, S, Balogh, M, Baldry, I, Baugh, C, Bland-Hawthorn, J, Bridges, T, Cannon, R, Cole, S, Collins, C, Cross, N, Dalton, G, Efstathiou, G, Ellis, R, Frenk, C, Glazebrook, K, Hawkins, E, Jackson, C, Lahav, O, Lewis, I, Lumsden, S, Maddox, S

“…Changes in the blue fraction are due to variations in the relative proportions of red and blue galaxies but the star formation rate for these two galaxy groups remains unchanged. Our results are most consistent with a model where the star formation rate declines rapidly and the blue galaxies tend to be dwarfs and do not favour mechanisms where the Butcher-Oemler effect is caused by processes specific to the cluster environment.…”

A Census of Baryons and Dark Matter in an Isolated, Milky Way Sized Elliptical Galaxy by Humphrey, Philip J., Buote, David A., Canizares, Claude R., Fabian, Andrew C., Miller, Jon M.

“…Finally, we find a strong heavy metal abundance gradient in the interstellar medium, qualitatively similar to those observed in massive galaxy groups.…”
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THERMAL AND CHEMICAL EVOLUTIONS OF GALAXY CLUSTERS OBSERVED WITH SUZAKU by Kosuke Sato, Kyoko Matsushita, Yoshitaka Ishisaki, Noriko Y. Yamasaki, Takaya Ohashi

“…As for the metallicity, we studied the metal abundances from O to Fe up to ~0.5 times the virial radius of galaxy groups and clusters. Comparing the results with supernova nucleosynthesis models, the number ratio of type II to Ia supernovae is estimated to be ~3.5. …”
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Strong lensing considerations for the LSST observing strategy by Verma, A, Collett, T, Smith, G, on behalf of the Strong Lensing Science Collaboration, in collaboration with the DESC Strong Lensing Science Working Group

“…LSST will drive studies of strongly lensed galaxies, galaxy groups and galaxy clusters into the statistical age. …”

Searching for Strong Gravitational Lenses by Lemon, Cameron, Courbin, Frédéric, More, Anupreeta, Schechter, Paul, Cañameras, Raoul, Delchambre, Ludovic, Leung, Calvin, Shu, Yiping, Spiniello, Chiara, Hezaveh, Yashar, Klüter, Jonas, McMahon, Richard

“…Here we review strong lens searches, covering various sources (quasars, galaxies, supernovae, FRBs, GRBs, and GWs), lenses (early- and late-type galaxies, groups, and clusters), datasets (imaging, spectra, and lightcurves), and wavelengths. …”
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Two-body relaxation in modified Newtonian dynamics by Ciotti, L, Binney, J

“…Application of these results to dwarf galaxies and groups and clusters of galaxies reveals that in MOND luminosity segregation should be far advanced in groups and clusters of galaxies, two body relaxation should have substantially modified the density profiles of galaxy groups, while objects with masses in excess of ~10M_sun should have spiralled to the centres of dwarf galaxies.…”

Searching for the Sources of Excess Extragalactic Dispersion of FRBs by Sunil Simha, Khee-Gan Lee, J. Xavier Prochaska, Ilya S. Khrykin, Yuxin Huang, Nicolas Tejos, Lachlan Marnoch, Metin Ata, Lucas Bernales, Shivani Bhandari, Jeff Cooke, Adam T. Deller, Stuart D. Ryder, Jielai Zhang

“…By modeling the gas distribution around the foreground galaxy halos and galaxy groups of the sight lines, we estimate DM _halos , their contribution to the FRB DMs. …”
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Exploiting Machine Learning and Disequilibrium in Galaxy Clusters to Obtain a Mass Profile by Mark J. Henriksen, Prajwal Panda

“…Four distinct substructures with rms velocity typical of galaxy groups or low-mass subclusters, when compared to cosmological simulations of galaxy cluster formation, suggest that A2146 is in the early stages of formation. …”
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Two-body relaxation in modified Newtonian dynamics by Ciotti, L, Binney, J

“…Application of these results to dwarf galaxies and groups and clusters of galaxies reveals that in MOND luminosity segregation should be far advanced in groups and clusters of galaxies, two-body relaxation should have substantially modified the density profiles of galaxy groups, while objects with masses in excess of ∼10 M⊙ should have spiralled to the centres of dwarf galaxies.…”

Some Properties of Galaxy Structures by Flin Piotr, Biernacka Monika, Godłowski Włodzimierz, Panko Elena, Piwowarska Paulina

“…Finally, we analyzed the Binggeli effect and found that the orientation of galaxy groups in the Local Supercluster (LSC), is strongly correlated with the distribution of neighbouring groups in the scale up to about 20 Mpc. …”
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Early Structure Formation from Primordial Density Fluctuations with a Blue, Tilted Power Spectrum: High-redshift Galaxies by Shingo Hirano, Naoki Yoshida

“…Because of frequent mergers, the structure of galaxies and galaxy groups appears clumpy. The BTPS model reproduces the observed stellar mass density at z = 7–9, and thus eases the claimed tension between galaxy formation theory and recent JWST observations. …”
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CFHTLenS: The Environmental Dependence of Galaxy Halo Masses from Weak Lensing by Gillis, B, Hudson, M, Erben, T, Heymans, C, Hildebrandt, H, Hoekstra, H, Kitching, T, Mellier, Y, Miller, L, Waerbeke, L, Bonnett, C, Coupon, J, Fu, L, Hilbert, S, Rowe, B, Schrabback, T, Semboloni, E, Uitert, E, Velander, M

“…We use weak gravitational lensing to analyse the dark matter halos around satellite galaxies in galaxy groups in the CFHTLenS dataset. This dataset is derived from the CFHTLS-Wide survey, and encompasses 154 sq. deg of high-quality shape data. …”

The radio galaxy 3C 356 and clues to the trigger mechanisms for powerful radio sources by Simpson, C, Rawlings, S

“…We explain the high luminosity and temperature of the diffuse X-ray emission from this system as the result of shock-heating of intracluster gas by the merger of two galaxy groups. Taken together with the results on other well-studied powerful radio sources, we suggest that the key ingredient for triggering a powerful radio source, at least at epochs corresponding to z~1, is a galaxy--galaxy interaction which can be orchestrated by the merger of their parent subclusters. …”

The H I content of dark matter haloes at z ≈ 0 from ALFALFA by Obuljen, A, Alonso, D, Villaescusa-Navarro, F, Yoon, I, Jones, M

“…We combine information from the clustering of H I galaxies in the 100 per cent data release of the Arecibo Legacy Fast ALFA survey, and from the H I content of optically selected galaxy groups found in the Sloan Digital Sky Survey to constrain the relation between halo mass Mh and its average total H I mass content MH I. …”

Quantifying baryon effects on the matter power spectrum and the weak lensing shear correlation by Schneider, A, Teyssier, R, Stadel, J, Chisari, N, Brun, A, Amara, A, Refregier, A

“…We show that these parameters can be constrained with the observed gas fraction of galaxy groups and clusters from X-ray data. Based on these observations we predict a beyond percent effect on the power spectrum above k=0.2–1.0 h/Mpc with a maximum suppression of 15–25 percent around k~ 10 h/Mpc. …”

The Intracluster Light and Its Link with the Dynamical State of the Host Group/Cluster: The Role of the Halo Concentration by Emanuele Contini, Seyoung Jeon, Jinsu Rhee, San Han, Sukyoung K. Yi

“…We investigate the role of halo concentration in the formation of intracluster light (ICL) in galaxy groups and clusters, as predicted by a state-of-the-art semianalytic model of galaxy formation, coupled with a set of high-resolution dark-matter-only simulations. …”
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ODIN: Where Do Lyα Blobs Live? Contextualizing Blob Environments within Large-scale Structure by Vandana Ramakrishnan, Byeongha Moon, Sang Hyeok Im, Rameen Farooq, Kyoung-Soo Lee, Eric Gawiser, Yujin Yang, Changbom Park, Ho Seong Hwang, Francisco Valdes, Maria Celeste Artale, Robin Ciardullo, Arjun Dey, Caryl Gronwall, Lucia Guaita, Woong-Seob Jeong, Nelson Padilla, Akriti Singh, Ann Zabludoff

“…Using LAEs as tracers of the underlying matter distribution, we identify overdense structures as galaxy groups, protoclusters, and filaments of the cosmic web. …”
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The Connection between the Intracluster Light and its Host Halo: Formation Time and Contribution from Different Channels by Emanuele Contini, Jinsu Rhee, San Han, Seyoung Jeon, Sukyoung K. Yi

“…We extend the analysis presented by Contini et al. to higher redshifts, up to z = 2, by focusing on the relation between the intracluster light (ICL) fraction and the halo mass, its dependence on redshift, the role played by the halo concentration, and the formation time, in a large sample of simulated galaxy groups/clusters with $13\lesssim {\rm{log}}({M}_{{\rm{halo}}}/{M}_{\odot })\lesssim 15$ . …”
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Gas-rich, Field Ultra-diffuse Galaxies Host Few Gobular Clusters by Michael G. Jones, Ananthan Karunakaran, Paul Bennet, David J. Sand, Kristine Spekkens, Burçin Mutlu-Pakdil, Denija Crnojević, Steven Janowiecki, Lukas Leisman, Catherine E. Fielder

“…This rules out gas-rich, field UDGs as potential progenitors of the GC-rich UDGs that are typically found in galaxy clusters. However, some in galaxy groups may be directly accreted from the field. …”
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Cross-correlating Planck tSZ with RCSLenS weak lensing: Implications for cosmology and AGN feedback by Hojjati, A, Tröster, T, Harnois-Déraps, J, McCarthy, I, van Waerbeke, L, Choi, A, Erben, T, Heymans, C, Hildebrandt, H, Hinshaw, G, Ma, Y, Miller, L, Viola, M, Tanimura, H

“…We find that a model with considerable AGN feedback that removes large quantities of hot gas from galaxy groups and WMAP-7yr best-fit cosmological parameters provides the best match to the measurements. …”