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Probing Galaxy Evolution in Massive Clusters Using ACT and DES: Splashback as a Cosmic Clock

Susmita Adhikari Tae-Hyeon Shin Bhuvnesh Jain Matt Hilton Eric Baxter Chihway Chang Risa H. Wechsler Nick Battaglia J. Richard Bond Sebastian Bocquet Steve K. Choi Joseph Derose Mark Devlin Jo Dunkley August E. Evrard Simone Ferraro J. Colin Hill John P. Hughes Patricio A. Gallardo Martine Lokken Amanda Macinnis Mathew S. Madhavacheril Jeffrey Mcmahon Frederico Nati Laura B. Newburgh Michael D. Niemack Lyman A. Page Antonella Palmese Bruce Partridge Eduardo Rozo Eli Rykoff Maria Salatino Alessandro Schillaci Neelima Sehgal Cristóbal Sifón Chun-Hao To Ed Wollack Hao-Yi Wu Zhilei Xu Michel Aguena Sahar Allam Alexandra Amon James Annis Santiago Avila David Bacon Emmanuel Bertin 1 Sunayana Bhargava David Brooks David L. Burke Aurelio C. Rosell Matias Carrasco Kind Jorge Carretero Francisco Javier Castander Ami Choi Matteo Costanzi Luiz N. da Costa Juan De Vicente Shantanu Desai Thomas H. Diehl Peter Doel Spencer Everett Ismael Ferrero Agnès Ferté Brenna Flaugher Pablo Fosalba Josh Frieman Juan García-Bellido Enrique Gaztanaga Daniel Gruen Robert A. Gruendl Julia Gschwend Gaston Gutierrez Will G. Hartley Samuel R. Hinton Devon L. Hollowood Klaus Honscheid David J. James Tesla Jeltema Kyler Kuehn Nikolay Kuropatkin Ofer Lahav Marcos Lima Marcio A. G. Maia Jennifer L. Marshall Paul Martini Peter Melchior Felipe Menanteau Ramon Miquel Robert Morgan Ricardo L. C. Ogando Francisco Paz-Chinchón Andrés Plazas Malagón Eusebio Sanchez Basilio Santiago Vic Scarpine Santiago Serrano Ignacio Sevilla-Noarbe Mathew Smith Marcelle Soares-Santos Eric Suchyta Molly E. C. Swanson Tamas N. Varga Reese D. Wilkinson Yuanyuan Zhang Jason E. Austermann James A. Beall Daniel T. Becker Edward V. Denison Shannon M. Duff Gene C. Hilton Johannes Hubmayr Joel N. Ullom Jeff Van Lanen Leila R. Vale 
Abstract : We measure the projected number density profiles of galaxies and the splashback feature in clusters selected by the Sunyaev-Zel'dovich effect from the Advanced Atacama Cosmology Telescope (AdvACT) survey using galaxies observed by the Dark Energy Survey (DES). The splashback radius is consistent with CDM-only simulations and is located at ${2.4}_{-0.4}^{+0.3}\,\mathrm{Mpc}\,{h}^{-1}$ . We split the galaxies on color and find significant differences in their profile shapes. Red and green-valley galaxies show a splashback-like minimum in their slope profile consistent with theory, while the bluest galaxies show a weak feature at a smaller radius. We develop a mapping of galaxies to subhalos in simulations and assign colors based on infall time onto their hosts. We find that the shift in location of the steepest slope and different profile shapes can be mapped to the average time of infall of galaxies of different colors. The steepest slope traces a discontinuity in the phase space of dark matter halos. By relating spatial profiles to infall time, we can use splashback as a clock to understand galaxy quenching. We find that red galaxies have on average been in clusters over 3.2 Gyr, green galaxies about 2.2 Gyr, while blue galaxies have been accreted most recently and have not reached apocenter. Using the full radial profiles, we fit a simple quenching model and find that the onset of galaxy quenching occurs after a delay of about a gigayear and that galaxies quench rapidly thereafter with an exponential timescale of 0.6 Gyr.
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Submitted on : Tuesday, August 9, 2022 - 12:06:01 PM
Last modification on : Wednesday, August 10, 2022 - 3:46:27 AM

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Susmita Adhikari, Tae-Hyeon Shin, Bhuvnesh Jain, Matt Hilton, Eric Baxter, et al.. Probing Galaxy Evolution in Massive Clusters Using ACT and DES: Splashback as a Cosmic Clock. The Astrophysical Journal, 2021, 923, ⟨10.3847/1538-4357/ac0bbc⟩. ⟨insu-03748178⟩

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