XIIIth School of Cosmology
November 12 - 18, 2017IESC, Cargèse
The CMB from A to Z
promises and challenges of the CMB as a cosmological probe

Extragalactic surveys with CMB experiments

Gianfranco De ZOTTI
Osservatorio Astronomico di Padova


  1. Relevant source populations
  2. Strongly lensed high-z galaxies
  3. Proto-clusters of galaxies
  4. Source polarization


I will discuss the potential of next generation Cosmic Microwave Background (CMB) experiments for studies of extragalactic sources, starting from what we learned from the Planck mission. The substantially better angular resolution foreseen for projects like CORE, PICO, CMB-S4 translates into substantially fainter detection limits. This will not only boost by large factors the number of detections but will also make possible entirely new science such as: the detection of thousands of high-z extreme strongly gravitationally lensed galaxies; the direct detection of large samples of galaxy proto-clusters up to z~4; the study of the evolution of the star-formation in virialized groups and clusters of galaxies; the study of the polarization properties of large samples of radio sources and, for the first time, of dusty galaxies at mm and sub-mm wavelengths.


  • Articles
    • De Zotti, G., et al. 2015. Extragalactic sources in Cosmic Microwave Background maps. JCAP 6, 018.
    •  De Zotti, G., et al. 2016. Exploring Cosmic Origins with CORE: Extragalactic sources in Cosmic Microwave Background maps.  arXiv:1609.07263.
    • Negrello, M., et al. 2017. The Herschel-ATLAS: a sample of 500 micron-selected lensed galaxies over 600 sq. deg.. MNRAS 465, 3558.
    • Negrello, M., et al. 2017. On the statistics of proto-cluster candidates detected in the Planck all-sky survey. MNRAS 470, 2253.
    • Planck Collaboration 2016. Planck 2015 results. XXVI. The Second Planck Catalogue of Compact Sources. A&A 594, A26
    • Planck Collaboration 2016. Planck intermediate results. XXXIX. The Planck list of high-redshift source candidates. A&A 596, A100.