The Atacama Cosmology Telescope: DR6 Power Spectra, Likelihoods and $Λ$CDM Parameters
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| Format: | Preprint |
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2025
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| author | Louis, Thibaut La Posta, Adrien Atkins, Zachary Jense, Hidde T. Abril-Cabezas, Irene Addison, Graeme E. Ade, Peter A. R. Aiola, Simone Alford, Tommy Alonso, David Amiri, Mandana An, Rui Austermann, Jason E. Barbavara, Eleonora Battaglia, Nicholas Battistelli, Elia Stefano Beall, James A. Bean, Rachel Beheshti, Ali Beringue, Benjamin Bhandarkar, Tanay Biermann, Emily Bolliet, Boris Bond, J Richard Calabrese, Erminia Capalbo, Valentina Carrero, Felipe Chen, Shi-Fan Chesmore, Grace Cho, Hsiao-mei Choi, Steve K. Clark, Susan E. Cothard, Nicholas F. Coughlin, Kevin Coulton, William Crichton, Devin Crowley, Kevin T. Darwish, Omar Devlin, Mark J. Dicker, Simon Duell, Cody J. Duff, Shannon M. Duivenvoorden, Adriaan J. Dunkley, Jo Dunner, Rolando Villagra, Carmen Embil Fankhanel, Max Farren, Gerrit S. Ferraro, Simone Foster, Allen Freundt, Rodrigo Fuzia, Brittany Gallardo, Patricio A. Garrido, Xavier Gerbino, Martina Giardiello, Serena Gill, Ajay Givans, Jahmour Gluscevic, Vera Goldstein, Samuel Golec, Joseph E. Gong, Yulin Guan, Yilun Halpern, Mark Harrison, Ian Hasselfield, Matthew Healy, Erin Henderson, Shawn Hensley, Brandon Hervías-Caimapo, Carlos Hill, J. Colin Hilton, Gene C. Hilton, Matt Hincks, Adam D. Hložek, Renée Ho, Shuay-Pwu Patty Hood, John Hornecker, Erika Huber, Zachary B. Hubmayr, Johannes Huffenberger, Kevin M. Hughes, John P. Ikape, Margaret Irwin, Kent Isopi, Giovanni Joshi, Neha Keller, Ben Kim, Joshua Knowles, Kenda Koopman, Brian J. Kosowsky, Arthur Kramer, Darby Kusiak, Aleksandra Lague, Alex Lakey, Victoria Lee, Eunseong Li, Yaqiong Li, Zack Limon, Michele Lokken, Martine Lungu, Marius MacCrann, Niall MacInnis, Amanda Madhavacheril, Mathew S. Maldonado, Diego Maldonado, Felipe Mallaby-Kay, Maya Marques, Gabriela A. van Marrewijk, Joshiwa McCarthy, Fiona McMahon, Jeff Mehta, Yogesh Menanteau, Felipe Moodley, Kavilan Morris, Thomas W. Mroczkowski, Tony Naess, Sigurd Namikawa, Toshiya Nati, Federico Nerval, Simran K. Newburgh, Laura Nicola, Andrina Niemack, Michael D. Nolta, Michael R. Orlowski-Scherer, John Pagano, Luca Page, Lyman A. Pandey, Shivam Partridge, Bruce Sarmiento, Karen Perez Prince, Heather Puddu, Roberto Qu, Frank J. Ragavan, Damien C. Guachalla, Bernardita Ried Rogers, Keir K. Rojas, Felipe Sakuma, Tai Schaan, Emmanuel Schmitt, Benjamin L. Sehgal, Neelima Shaikh, Shabbir Sherwin, Blake D. Sierra, Carlos Sievers, Jon Sifón, Cristóbal Simon, Sara Sonka, Rita Spergel, David N. Staggs, Suzanne T. Storer, Emilie Surrao, Kristen Switzer, Eric R. Tampier, Niklas Thornton, Robert Trac, Hy Tucker, Carole Ullom, Joel Vale, Leila R. Van Engelen, Alexander Van Lanen, Jeff Vargas, Cristian Vavagiakis, Eve M. Wagoner, Kasey Wang, Yuhan Wenzl, Lukas Wollack, Edward J. Zheng, Kaiwen |
| author_facet | Louis, Thibaut La Posta, Adrien Atkins, Zachary Jense, Hidde T. Abril-Cabezas, Irene Addison, Graeme E. Ade, Peter A. R. Aiola, Simone Alford, Tommy Alonso, David Amiri, Mandana An, Rui Austermann, Jason E. Barbavara, Eleonora Battaglia, Nicholas Battistelli, Elia Stefano Beall, James A. Bean, Rachel Beheshti, Ali Beringue, Benjamin Bhandarkar, Tanay Biermann, Emily Bolliet, Boris Bond, J Richard Calabrese, Erminia Capalbo, Valentina Carrero, Felipe Chen, Shi-Fan Chesmore, Grace Cho, Hsiao-mei Choi, Steve K. Clark, Susan E. Cothard, Nicholas F. Coughlin, Kevin Coulton, William Crichton, Devin Crowley, Kevin T. Darwish, Omar Devlin, Mark J. Dicker, Simon Duell, Cody J. Duff, Shannon M. Duivenvoorden, Adriaan J. Dunkley, Jo Dunner, Rolando Villagra, Carmen Embil Fankhanel, Max Farren, Gerrit S. Ferraro, Simone Foster, Allen Freundt, Rodrigo Fuzia, Brittany Gallardo, Patricio A. Garrido, Xavier Gerbino, Martina Giardiello, Serena Gill, Ajay Givans, Jahmour Gluscevic, Vera Goldstein, Samuel Golec, Joseph E. Gong, Yulin Guan, Yilun Halpern, Mark Harrison, Ian Hasselfield, Matthew Healy, Erin Henderson, Shawn Hensley, Brandon Hervías-Caimapo, Carlos Hill, J. Colin Hilton, Gene C. Hilton, Matt Hincks, Adam D. Hložek, Renée Ho, Shuay-Pwu Patty Hood, John Hornecker, Erika Huber, Zachary B. Hubmayr, Johannes Huffenberger, Kevin M. Hughes, John P. Ikape, Margaret Irwin, Kent Isopi, Giovanni Joshi, Neha Keller, Ben Kim, Joshua Knowles, Kenda Koopman, Brian J. Kosowsky, Arthur Kramer, Darby Kusiak, Aleksandra Lague, Alex Lakey, Victoria Lee, Eunseong Li, Yaqiong Li, Zack Limon, Michele Lokken, Martine Lungu, Marius MacCrann, Niall MacInnis, Amanda Madhavacheril, Mathew S. Maldonado, Diego Maldonado, Felipe Mallaby-Kay, Maya Marques, Gabriela A. van Marrewijk, Joshiwa McCarthy, Fiona McMahon, Jeff Mehta, Yogesh Menanteau, Felipe Moodley, Kavilan Morris, Thomas W. Mroczkowski, Tony Naess, Sigurd Namikawa, Toshiya Nati, Federico Nerval, Simran K. Newburgh, Laura Nicola, Andrina Niemack, Michael D. Nolta, Michael R. Orlowski-Scherer, John Pagano, Luca Page, Lyman A. Pandey, Shivam Partridge, Bruce Sarmiento, Karen Perez Prince, Heather Puddu, Roberto Qu, Frank J. Ragavan, Damien C. Guachalla, Bernardita Ried Rogers, Keir K. Rojas, Felipe Sakuma, Tai Schaan, Emmanuel Schmitt, Benjamin L. Sehgal, Neelima Shaikh, Shabbir Sherwin, Blake D. Sierra, Carlos Sievers, Jon Sifón, Cristóbal Simon, Sara Sonka, Rita Spergel, David N. Staggs, Suzanne T. Storer, Emilie Surrao, Kristen Switzer, Eric R. Tampier, Niklas Thornton, Robert Trac, Hy Tucker, Carole Ullom, Joel Vale, Leila R. Van Engelen, Alexander Van Lanen, Jeff Vargas, Cristian Vavagiakis, Eve M. Wagoner, Kasey Wang, Yuhan Wenzl, Lukas Wollack, Edward J. Zheng, Kaiwen |
| contents | We present power spectra of the cosmic microwave background (CMB) anisotropy in temperature and polarization, measured from the Data Release 6 maps made from Atacama Cosmology Telescope (ACT) data. These cover 19,000 deg$^2$ of sky in bands centered at 98, 150 and 220 GHz, with white noise levels three times lower than Planck in polarization. We find that the ACT angular power spectra estimated over 10,000 deg$^2$, and measured to arcminute scales in TT, TE and EE, are well fit by the sum of CMB and foregrounds, where the CMB spectra are described by the $Λ$CDM model. Combining ACT with larger-scale Planck data, the joint P-ACT dataset provides tight limits on the ingredients, expansion rate, and initial conditions of the universe. We find similar constraining power, and consistent results, from either the Planck power spectra or from ACT combined with WMAP data, as well as from either temperature or polarization in the joint P-ACT dataset. When combined with CMB lensing from ACT and Planck, and baryon acoustic oscillation data from DESI DR1, we measure a baryon density of $Ω_b h^2=0.0226\pm0.0001$, a cold dark matter density of $Ω_c h^2=0.118\pm0.001$, a Hubble constant of $H_0=68.22\pm0.36$ km/s/Mpc, a spectral index of $n_s=0.974\pm0.003$, and an amplitude of density fluctuations of $σ_8=0.813\pm0.005$. Including the DESI DR2 data tightens the Hubble constant to $H_0=68.43\pm0.27$ km/s/Mpc; $Λ$CDM parameters agree between the P-ACT and DESI DR2 data at the $1.6σ$ level. We find no evidence for excess lensing in the power spectrum, and no departure from spatial flatness. The contribution from Sunyaev-Zel'dovich (SZ) anisotropy is detected at high significance; we find evidence for a tilt with suppressed small-scale power compared to our baseline SZ template spectrum, consistent with hydrodynamical simulations with feedback. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_14452 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Atacama Cosmology Telescope: DR6 Power Spectra, Likelihoods and $Λ$CDM Parameters Louis, Thibaut La Posta, Adrien Atkins, Zachary Jense, Hidde T. Abril-Cabezas, Irene Addison, Graeme E. Ade, Peter A. R. Aiola, Simone Alford, Tommy Alonso, David Amiri, Mandana An, Rui Austermann, Jason E. Barbavara, Eleonora Battaglia, Nicholas Battistelli, Elia Stefano Beall, James A. Bean, Rachel Beheshti, Ali Beringue, Benjamin Bhandarkar, Tanay Biermann, Emily Bolliet, Boris Bond, J Richard Calabrese, Erminia Capalbo, Valentina Carrero, Felipe Chen, Shi-Fan Chesmore, Grace Cho, Hsiao-mei Choi, Steve K. Clark, Susan E. Cothard, Nicholas F. Coughlin, Kevin Coulton, William Crichton, Devin Crowley, Kevin T. Darwish, Omar Devlin, Mark J. Dicker, Simon Duell, Cody J. Duff, Shannon M. Duivenvoorden, Adriaan J. Dunkley, Jo Dunner, Rolando Villagra, Carmen Embil Fankhanel, Max Farren, Gerrit S. Ferraro, Simone Foster, Allen Freundt, Rodrigo Fuzia, Brittany Gallardo, Patricio A. Garrido, Xavier Gerbino, Martina Giardiello, Serena Gill, Ajay Givans, Jahmour Gluscevic, Vera Goldstein, Samuel Golec, Joseph E. Gong, Yulin Guan, Yilun Halpern, Mark Harrison, Ian Hasselfield, Matthew Healy, Erin Henderson, Shawn Hensley, Brandon Hervías-Caimapo, Carlos Hill, J. Colin Hilton, Gene C. Hilton, Matt Hincks, Adam D. Hložek, Renée Ho, Shuay-Pwu Patty Hood, John Hornecker, Erika Huber, Zachary B. Hubmayr, Johannes Huffenberger, Kevin M. Hughes, John P. Ikape, Margaret Irwin, Kent Isopi, Giovanni Joshi, Neha Keller, Ben Kim, Joshua Knowles, Kenda Koopman, Brian J. Kosowsky, Arthur Kramer, Darby Kusiak, Aleksandra Lague, Alex Lakey, Victoria Lee, Eunseong Li, Yaqiong Li, Zack Limon, Michele Lokken, Martine Lungu, Marius MacCrann, Niall MacInnis, Amanda Madhavacheril, Mathew S. Maldonado, Diego Maldonado, Felipe Mallaby-Kay, Maya Marques, Gabriela A. van Marrewijk, Joshiwa McCarthy, Fiona McMahon, Jeff Mehta, Yogesh Menanteau, Felipe Moodley, Kavilan Morris, Thomas W. Mroczkowski, Tony Naess, Sigurd Namikawa, Toshiya Nati, Federico Nerval, Simran K. Newburgh, Laura Nicola, Andrina Niemack, Michael D. Nolta, Michael R. Orlowski-Scherer, John Pagano, Luca Page, Lyman A. Pandey, Shivam Partridge, Bruce Sarmiento, Karen Perez Prince, Heather Puddu, Roberto Qu, Frank J. Ragavan, Damien C. Guachalla, Bernardita Ried Rogers, Keir K. Rojas, Felipe Sakuma, Tai Schaan, Emmanuel Schmitt, Benjamin L. Sehgal, Neelima Shaikh, Shabbir Sherwin, Blake D. Sierra, Carlos Sievers, Jon Sifón, Cristóbal Simon, Sara Sonka, Rita Spergel, David N. Staggs, Suzanne T. Storer, Emilie Surrao, Kristen Switzer, Eric R. Tampier, Niklas Thornton, Robert Trac, Hy Tucker, Carole Ullom, Joel Vale, Leila R. Van Engelen, Alexander Van Lanen, Jeff Vargas, Cristian Vavagiakis, Eve M. Wagoner, Kasey Wang, Yuhan Wenzl, Lukas Wollack, Edward J. Zheng, Kaiwen Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology We present power spectra of the cosmic microwave background (CMB) anisotropy in temperature and polarization, measured from the Data Release 6 maps made from Atacama Cosmology Telescope (ACT) data. These cover 19,000 deg$^2$ of sky in bands centered at 98, 150 and 220 GHz, with white noise levels three times lower than Planck in polarization. We find that the ACT angular power spectra estimated over 10,000 deg$^2$, and measured to arcminute scales in TT, TE and EE, are well fit by the sum of CMB and foregrounds, where the CMB spectra are described by the $Λ$CDM model. Combining ACT with larger-scale Planck data, the joint P-ACT dataset provides tight limits on the ingredients, expansion rate, and initial conditions of the universe. We find similar constraining power, and consistent results, from either the Planck power spectra or from ACT combined with WMAP data, as well as from either temperature or polarization in the joint P-ACT dataset. When combined with CMB lensing from ACT and Planck, and baryon acoustic oscillation data from DESI DR1, we measure a baryon density of $Ω_b h^2=0.0226\pm0.0001$, a cold dark matter density of $Ω_c h^2=0.118\pm0.001$, a Hubble constant of $H_0=68.22\pm0.36$ km/s/Mpc, a spectral index of $n_s=0.974\pm0.003$, and an amplitude of density fluctuations of $σ_8=0.813\pm0.005$. Including the DESI DR2 data tightens the Hubble constant to $H_0=68.43\pm0.27$ km/s/Mpc; $Λ$CDM parameters agree between the P-ACT and DESI DR2 data at the $1.6σ$ level. We find no evidence for excess lensing in the power spectrum, and no departure from spatial flatness. The contribution from Sunyaev-Zel'dovich (SZ) anisotropy is detected at high significance; we find evidence for a tilt with suppressed small-scale power compared to our baseline SZ template spectrum, consistent with hydrodynamical simulations with feedback. |
| title | The Atacama Cosmology Telescope: DR6 Power Spectra, Likelihoods and $Λ$CDM Parameters |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2503.14452 |