Probing Galaxy Evolution in Massive Clusters Using ACT and DES: Splashback as a Cosmic Clock
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Published:2021-12-01
Issue:1
Volume:923
Page:37
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ISSN:0004-637X
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Container-title:The Astrophysical Journal
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language:
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Short-container-title:ApJ
Author:
Adhikari SusmitaORCID, Shin Tae-hyeon, Jain Bhuvnesh, Hilton MattORCID, Baxter EricORCID, Chang ChihwayORCID, Wechsler Risa H.ORCID, Battaglia Nick, Bond J. RichardORCID, Bocquet SebastianORCID, Choi Steve K.ORCID, DeRose JosephORCID, Devlin MarkORCID, Dunkley Jo, Evrard August E., Ferraro SimoneORCID, Hill J. Colin, Hughes John P.ORCID, Gallardo Patricio A., Lokken Martine, MacInnis Amanda, Madhavacheril Mathew S.ORCID, McMahon Jeffrey, Nati Frederico, Newburgh Laura B., Niemack Michael D., Page Lyman A.ORCID, Palmese AntonellaORCID, Partridge Bruce, Rozo Eduardo, Rykoff EliORCID, Salatino Maria, Schillaci Alessandro, Sehgal NeelimaORCID, Sifón CristóbalORCID, To Chun-Hao, Wollack EdORCID, Wu Hao-Yi, Xu ZhileiORCID, Aguena Michel, Allam Sahar, Amon Alexandra, Annis JamesORCID, Avila SantiagoORCID, Bacon David, Bertin EmmanuelORCID, Bhargava Sunayana, Brooks DavidORCID, Burke David L.ORCID, Rosell Aurelio C., Kind Matias Carrasco, Carretero JorgeORCID, Castander Francisco JavierORCID, Choi Ami, Costanzi MatteoORCID, da Costa Luiz N., Vicente Juan De, Desai ShantanuORCID, Diehl Thomas H., Doel Peter, Everett Spencer, Ferrero Ismael, Ferté Agnès, Flaugher Brenna, Fosalba PabloORCID, Frieman Josh, García-Bellido JuanORCID, Gaztanaga EnriqueORCID, Gruen DanielORCID, Gruendl Robert A.ORCID, Gschwend JuliaORCID, Gutierrez Gaston, Hartley Will G., Hinton Samuel R.ORCID, Hollowood Devon L.ORCID, Honscheid Klaus, James David J., Jeltema Tesla, Kuehn KylerORCID, Kuropatkin NikolayORCID, Lahav Ofer, Lima Marcos, Maia Marcio A. G., Marshall Jennifer L.ORCID, Martini Paul, Melchior PeterORCID, Menanteau FelipeORCID, Miquel RamonORCID, Morgan Robert, L. C. Ogando Ricardo, Paz-Chinchón Francisco, Malagón Andrés Plazas, Sanchez EusebioORCID, Santiago Basilio, Scarpine Vic, Serrano Santiago, Sevilla-Noarbe IgnacioORCID, Smith MathewORCID, Soares-Santos MarcelleORCID, Suchyta Eric, E. C. Swanson Molly, Varga Tamas N., Wilkinson Reese D., Zhang Yuanyuan, Austermann Jason E., Beall James A., Becker Daniel T., Denison Edward V., Duff Shannon M., Hilton Gene C., Hubmayr Johannes, Ullom Joel N., Lanen Jeff Van, Vale Leila R.
Abstract
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
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.
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
21 articles.
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