The Atacama Cosmology Telescope: A CMB lensing mass map over 2100 square degrees of sky and its cross-correlation with BOSS-CMASS galaxies

Omar Darwish, Mathew S. Madhavacheril, Blake D. Sherwin, Simone Aiola, Nicholas Battaglia, James A. Beall, Daniel T. Becker, J. Richard Bond, Erminia Calabrese, Steve K. Choi, Mark J. Devlin, Jo Dunkley, Rolando Dünner, Simone Ferraro, Anna E. Fox, Patricio A. Gallardo, Yilun Guan, Mark Halpern, Dongwon Han, Matthew HasselfieldJ. Colin Hill, Gene C. Hilton, Matt Hilton, Adam D. Hincks, Shuay Pwu Patty Ho, J. Hubmayr, John P. Hughes, Brian J. Koopman, Arthur Kosowsky, J. Van Lanen, Thibaut Louis, Marius Lungu, Amanda MacInnis, Loïc Maurin, Jeffrey McMahon, Kavilan Moodley, Sigurd Naess, Toshiya Namikawa, Federico Nati, Laura Newburgh, John P. Nibarger, Michael D. Niemack, Lyman A. Page, Bruce Partridge, Frank J. Qu, Naomi Robertson, Alessandro Schillaci, Benjamin Schmitt, Neelima Sehgal, Cristóbal Sifón, David N. Spergel, Suzanne Staggs, Emilie Storer, Alexander Van Engelen, Edward J. Wollack

Research output: Contribution to journalArticlepeer-review

74 Scopus citations


We construct cosmic microwave background lensing mass maps using data from the 2014 and 2015 seasons of observations with the Atacama Cosmology Telescope (ACT). These maps cover 2100 square degrees of sky and overlap with a wide variety of optical surveys. The maps are signal dominated on large scales and have fidelity such that their correlation with the cosmic infrared background is clearly visible by eye. We also create lensing maps with thermal Sunyaev-Zel'dovich contamination removed using a novel cleaning procedure that only slightly degrades the lensing signal-to-noise ratio. The cross-spectrum between the cleaned lensing map and the BOSS CMASS galaxy sample is detected at 10σ significance, with an amplitude of A = 1.02 ± 0.10 relative to the Planck best-fitting Lambda cold dark matter cosmological model with fiducial linear galaxy bias. Our measurement lays the foundation for lensing cross-correlation science with current ACT data and beyond.

Original languageEnglish (US)
Pages (from-to)2250-2263
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Jan 1 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • cosmic background radiation
  • cosmology: observations
  • gravitational lensing: weak
  • large-scale structure of Universe


Dive into the research topics of 'The Atacama Cosmology Telescope: A CMB lensing mass map over 2100 square degrees of sky and its cross-correlation with BOSS-CMASS galaxies'. Together they form a unique fingerprint.

Cite this