Backlighting extended gas halos around luminous red galaxies: kinematic Sunyaev-Zel'dovich effect from DESI Y1 x ACT
Backlighting extended gas halos around luminous red galaxies: kinematic Sunyaev-Zel'dovich effect from DESI Y1 x ACT
The gas density profile around galaxies, shaped by feedback and affecting the galaxy lensing signal, is imprinted on the cosmic microwave background (CMB) by the kinematic Sunyaev-Zel'dovich effect (kSZ). We precisely measure this effect ($S/N\approx 10$) via velocity stacking with $825,283$ spectroscopically confirmed luminous red galaxies (LRG) from the Dark Energy Spectroscopic Instrument (DESI) Y1 survey, which overlap with the Atacama Cosmology Telescope (ACT) Data Release 6 temperature maps over $\geq 4,000 \text{deg}^2$. We explore the kSZ dependence with various galaxy parameters. We find no significant trend with redshift, but clear trends with stellar mass and absolute magnitude in $g$, $r$, and $z$ bands. We highlight new challenges when comparing data and hydrodynamical simulations. Our simple and most conservative analysis suggests that the gas is more extended than the dark matter (99.5% confidence, i.e. PTE = 0.005). It also hints at a preference for galaxy formation models with more feedback (Illustris $z=0.5$, PTE = 0.37) rather than less (Illustris TNG $z=0.8$, PTE = 0.045), though with less statistical significance. In all cases, a free multiplicative amplitude was fit to the simulated profiles, and further modeling work is required to firm up these conclusions. We find consistency between kSZ profiles around spectroscopic and photometric LRG, with comparable statistical power, thus increasing our confidence in the photometric analysis. Additionally, we present the first kSZ measurement around DESI Y1 bright galaxy sample (BGS) and emission-line galaxies (ELG), whose features match qualitative expectations. Finally, we forecast $S/N \sim 50$ for future stacked kSZ measurements using data from ACT, DESI Y3, and Rubin Observatory. These measurements will serve as an input for galaxy formation models and baryonic uncertainties in galaxy lensing.
Bernardita Ried Guachalla、Emmanuel Schaan、Boryana Hadzhiyska、Simone Ferraro、Jessica N. Aguilar、Steven Ahlen、Nicholas Battaglia、Davide Bianchi、Richard Bond、David Brooks、Todd Claybaugh、William R. Coulton、Axel de la Macorra、Mark J. Devlin、Arjun Dey、Peter Doel、Jo Dunkley、Kevin Fanning、Jaime Forero-Romero、Enrique Gazta?aga、Satya Gontcho A Gontcho、Gaston Gutierrez、Julien Guy、J. Colin Hill、Klaus Honscheid、Stephanie Juneau、Theodore Kisner、Anthony Kremin、Andrew Lambert、Martin Landriau、Laurent Le Guillou、Niall MacCrann、Marc Manera、Aaron Meisner、Ramon Miquel、Kavilan Moodley、John Moustakas、Tony Mroczkowski、Adam D. Myers、Michael D. Niemack、Gustavo Niz、Nathalie Palanque-Delabrouille、Will Percival、Ignasi Pérez-Ràfols、Claire Poppett、Francisco Prada、Frank J. Qu、Graziano Rossi、Eusebio Sanchez、David Schlegel、Michael Schubnell、Hee-Jong Seo、Cristóbal Sifón、David N. Spergel、David Sprayberry、Gregory Tarlé、Mariana Vargas-Maga?a、Eve M. Vavagiakis、Benjamin A. Weaver、Edward J. Wollack、Pauline Zarrouk
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Bernardita Ried Guachalla,Emmanuel Schaan,Boryana Hadzhiyska,Simone Ferraro,Jessica N. Aguilar,Steven Ahlen,Nicholas Battaglia,Davide Bianchi,Richard Bond,David Brooks,Todd Claybaugh,William R. Coulton,Axel de la Macorra,Mark J. Devlin,Arjun Dey,Peter Doel,Jo Dunkley,Kevin Fanning,Jaime Forero-Romero,Enrique Gazta?aga,Satya Gontcho A Gontcho,Gaston Gutierrez,Julien Guy,J. Colin Hill,Klaus Honscheid,Stephanie Juneau,Theodore Kisner,Anthony Kremin,Andrew Lambert,Martin Landriau,Laurent Le Guillou,Niall MacCrann,Marc Manera,Aaron Meisner,Ramon Miquel,Kavilan Moodley,John Moustakas,Tony Mroczkowski,Adam D. Myers,Michael D. Niemack,Gustavo Niz,Nathalie Palanque-Delabrouille,Will Percival,Ignasi Pérez-Ràfols,Claire Poppett,Francisco Prada,Frank J. Qu,Graziano Rossi,Eusebio Sanchez,David Schlegel,Michael Schubnell,Hee-Jong Seo,Cristóbal Sifón,David N. Spergel,David Sprayberry,Gregory Tarlé,Mariana Vargas-Maga?a,Eve M. Vavagiakis,Benjamin A. Weaver,Edward J. Wollack,Pauline Zarrouk.Backlighting extended gas halos around luminous red galaxies: kinematic Sunyaev-Zel'dovich effect from DESI Y1 x ACT[EB/OL].(2025-03-25)[2025-04-26].https://arxiv.org/abs/2503.19870.点此复制
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