Backlighting extended gas halos around luminous red galaxies: kinematic Sunyaev-Zel'dovich effect from DESI Y1 x ACT
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arXiv
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| Natura: | Preprint |
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2025
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| author | Guachalla, Bernardita Ried Schaan, Emmanuel Hadzhiyska, Boryana Ferraro, Simone Aguilar, Jessica N. Ahlen, Steven Battaglia, Nicholas Bianchi, Davide Bond, Richard Brooks, David Claybaugh, Todd Coulton, William R. de la Macorra, Axel Devlin, Mark J. Dey, Arjun Doel, Peter Dunkley, Jo Fanning, Kevin Forero-Romero, Jaime Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien Hill, J. Colin Honscheid, Klaus Juneau, Stephanie Kisner, Theodore Kremin, Anthony Lambert, Andrew Landriau, Martin Guillou, Laurent Le MacCrann, Niall Manera, Marc Meisner, Aaron Miquel, Ramon Moodley, Kavilan Moustakas, John Mroczkowski, Tony Myers, Adam D. Niemack, Michael D. Niz, Gustavo Palanque-Delabrouille, Nathalie Percival, Will Pérez-Ràfols, Ignasi Poppett, Claire Prada, Francisco Qu, Frank J. Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Sifón, Cristóbal Spergel, David N. Sprayberry, David Tarlé, Gregory Vargas-Magaña, Mariana Vavagiakis, Eve M. Weaver, Benjamin A. Wollack, Edward J. Zarrouk, Pauline |
| author_facet | Guachalla, Bernardita Ried Schaan, Emmanuel Hadzhiyska, Boryana Ferraro, Simone Aguilar, Jessica N. Ahlen, Steven Battaglia, Nicholas Bianchi, Davide Bond, Richard Brooks, David Claybaugh, Todd Coulton, William R. de la Macorra, Axel Devlin, Mark J. Dey, Arjun Doel, Peter Dunkley, Jo Fanning, Kevin Forero-Romero, Jaime Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien Hill, J. Colin Honscheid, Klaus Juneau, Stephanie Kisner, Theodore Kremin, Anthony Lambert, Andrew Landriau, Martin Guillou, Laurent Le MacCrann, Niall Manera, Marc Meisner, Aaron Miquel, Ramon Moodley, Kavilan Moustakas, John Mroczkowski, Tony Myers, Adam D. Niemack, Michael D. Niz, Gustavo Palanque-Delabrouille, Nathalie Percival, Will Pérez-Ràfols, Ignasi Poppett, Claire Prada, Francisco Qu, Frank J. Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Sifón, Cristóbal Spergel, David N. Sprayberry, David Tarlé, Gregory Vargas-Magaña, Mariana Vavagiakis, Eve M. Weaver, Benjamin A. Wollack, Edward J. Zarrouk, Pauline |
| contents | 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 more than 800,000 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 deg$^2$. We explore the kSZ dependence with various galaxy parameters and find no significant trend with redshift, but clear trends with stellar mass and absolute magnitude in $g$, $r$, and $z$ bands. Our analysis suggests that the gas extends beyond the dark matter halo (99.5\% confidence, i.e. PTE = 0.005). We find a tentative preference for hydrodynamical simulation models with stronger feedback that drives gas further out (Illustris $z=0.5$, PTE = 0.37) over weaker-feedback cases (IllustrisTNG $z=0.8$, PTE = 0.045), though with limited 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_19870 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Backlighting extended gas halos around luminous red galaxies: kinematic Sunyaev-Zel'dovich effect from DESI Y1 x ACT Guachalla, Bernardita Ried Schaan, Emmanuel Hadzhiyska, Boryana Ferraro, Simone Aguilar, Jessica N. Ahlen, Steven Battaglia, Nicholas Bianchi, Davide Bond, Richard Brooks, David Claybaugh, Todd Coulton, William R. de la Macorra, Axel Devlin, Mark J. Dey, Arjun Doel, Peter Dunkley, Jo Fanning, Kevin Forero-Romero, Jaime Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien Hill, J. Colin Honscheid, Klaus Juneau, Stephanie Kisner, Theodore Kremin, Anthony Lambert, Andrew Landriau, Martin Guillou, Laurent Le MacCrann, Niall Manera, Marc Meisner, Aaron Miquel, Ramon Moodley, Kavilan Moustakas, John Mroczkowski, Tony Myers, Adam D. Niemack, Michael D. Niz, Gustavo Palanque-Delabrouille, Nathalie Percival, Will Pérez-Ràfols, Ignasi Poppett, Claire Prada, Francisco Qu, Frank J. Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Sifón, Cristóbal Spergel, David N. Sprayberry, David Tarlé, Gregory Vargas-Magaña, Mariana Vavagiakis, Eve M. Weaver, Benjamin A. Wollack, Edward J. Zarrouk, Pauline Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics 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 more than 800,000 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 deg$^2$. We explore the kSZ dependence with various galaxy parameters and find no significant trend with redshift, but clear trends with stellar mass and absolute magnitude in $g$, $r$, and $z$ bands. Our analysis suggests that the gas extends beyond the dark matter halo (99.5\% confidence, i.e. PTE = 0.005). We find a tentative preference for hydrodynamical simulation models with stronger feedback that drives gas further out (Illustris $z=0.5$, PTE = 0.37) over weaker-feedback cases (IllustrisTNG $z=0.8$, PTE = 0.045), though with limited 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. |
| title | Backlighting extended gas halos around luminous red galaxies: kinematic Sunyaev-Zel'dovich effect from DESI Y1 x ACT |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2503.19870 |