Cosmology

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Caught in the rhythm II: Competitive alignments of satellites with their inner halo and central galaxy

(2017)

Authors:

Charlotte Welker, Chris Power, Christophe Pichon, Yohan Dubois, Julien Devriendt, Sandrine Codis

Cosmic CARNage I: on the calibration of galaxy formation models

(2017)

Authors:

Alexander Knebe, Frazer R Pearce, Violeta Gonzalez-Perez, Peter A Thomas, Andrew Benson, Rachel Asquith, Jeremy Blaizot, Richard Bower, Jorge Carretero, Francisco J Castander, Andrea Cattaneo, Sofia A Cora, Darren J Croton, Weiguang Cui, Daniel Cunnama, Julien E Devriendt, Pascal J Elahi, Andreea Font, Fabio Fontanot, Ignacio D Gargiulo, John Helly, Bruno Henriques, Jaehyun Lee, Gary A Mamon, Julian Onions, Nelson D Padilla, Chris Power, Arnau Pujol, Andrés N Ruiz, Chaichalit Srisawat, Adam RH Stevens, Edouard Tollet, Cristian A Vega-Martínez, Sukyoung K Yi

Interaction in the dark sector: a Bayesian analysis with latest observations

ArXiv 1712.05428 (2017)

Authors:

T Ferreira, C Pigozzo, S Carneiro, JS Alcaniz

The SAMI Galaxy Survey: global stellar populations on the size-mass plane

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 472:3 (2017) 2833-2855

Authors:

N Scott, S Brough, SM Croom, RL Davies, J van de Sande, JT Allen, J Bland-Hawthorn, JJ Bryant, L Cortese, F D'Eugenio, C Federrath, I Ferreras, M Goodwin, B Groves, I Konstantopoulos, JS Lawrence, AM Medling, AJ Moffett, MS Owers, S Richards, ASG Robotham, C Tonini, SK Yi

The KMOS Cluster Survey (KCS). III. Fundamental Plane of Cluster Galaxies at z ≃ 1.80 in JKCS 041

Astrophysical Journal 850:2 (2017)

Authors:

LJ Prichard, RL Davies, A Beifiori, JCC Chan, M Cappellari, RCW Houghton, JT Mendel, R Bender, A Galametz, RP Saglia, JP Stott, DJ Wilman, IJ Lewis, R Sharples, M Wegner

Abstract:

© 2017. The American Astronomical Society. All rights reserved. We present data for 16 galaxies in the overdensity JKCS 041 at z ≃ 1.80 as part of the K-band Multi-Object Spectrograph (KMOS) Cluster Survey (KCS). With 20 hr integrations, we have obtained deep absorption-line spectra from which we derived velocity dispersions for seven quiescent galaxies. We combined photometric parameters derived from Hubble Space Telescope images with the dispersions to construct a fundamental plane (FP) for quiescent galaxies in JKCS 041. From the zero-point evolution of the FP, we derived a formation redshift for the galaxies of z form = 3.0 ± 0.3, corresponding to a mean age of 1.4 ± 0.2 Gyr. We tested the effect of structural and velocity dispersion evolution on our FP zero-point and found a negligible contribution when using dynamical mass-normalized parameters (∼3%) but a significant contribution from stellar-mass-normalized parameters (∼42%). From the relative velocities of the galaxies, we probed the 3D structure of these 16 confirmed members of JKCS 041 and found that a group of galaxies in the southwest of the overdensity had systematically higher velocities. We derived ages for the galaxies in the different groups from the FP. We found that the eastextending group had typically older galaxies (2.1 +0.3 0.2 Gyr) than those in the southwest group (0.3 ± 0.2 Gyr). Although based on small numbers, the overdensity dynamics, morphology, and age results could indicate that JKCS 041 is in formation and may comprise two merging groups of galaxies. This result could link large-scale structure to ages of galaxies for the first time at this redshift.