Browsing by Subject "Observational cosmology"

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  • Absolute calibration of diffuse radio surveys at 45 and 150 MHz 

    Monsalve, Raúl A.; Rogers, Alan E. E.; Bowman, Judd D.; Mahesh, Nivedita; Murray, Steven G.; Mozdzen, Thomas J.; Johnson, Leroy; Barrett, John; Samson, Titu; Lewis, David (2021-02)
    We use measurements from the Experiment to Detect the Global EoR Signature (EDGES) to determine scale and zero-level corrections to the diffuse radio surveys by Guzmán et al. at 45 MHz and by Landecker & Wielebinski at 150 ...

  • Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q band 

    Petroff, Matthew A.; Eimer, Joseph R.; Harrington, Kathleen; Ali, Aamir; Appel, John W.; Bennett, Charles L.; Brewer, Michael K.; Bustos Placencia, Ricardo; Chan, Manwei; Chuss, David T.; Cleary, Joseph; Denes Couto, Jullianna; Dahal, Sumit; Dünner, Rolando; Essinger-Hileman, Thomas; Fluxá Rojas, Pedro; Gothe, Dominik; Iuliano, Jeffrey; Marriage, Tobias A.; Miller, Nathan J.; Núñez, Carolina; Padilla, Ivan L.; Parker, Lucas; Reeves, Rodrigo; Rostem, Karwan; Nunes Valle, Deniz Augusto; Watts, Duncan J.; Weiland, Janet L.; Wollack, Edward J.; Xu, Zhilei (2020-02-01)
    The Earth’s magnetic field induces Zeeman splitting of the magnetic dipole transitions of molecular oxygen in the atmosphere, which produces polarized emission in the millimeter-wave regime. This polarized emission ...

  • Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A Measurement of Circular Polarization at 40 GHz 

    Padilla, Ivan L.; Eimer, Joseph R.; Li, Yunyang; Addison, Graeme E.; Ali, Aamir; Appel, John W.; Bennett, Charles L.; Bustos Placencia, Ricardo; Brewer, Michael K.; Chan, Manwei; Chuss, David T.; Cleary, Joseph; Couto, Jullianna Denes; Dahal, Sumit; Denis, Kevin; Dünner, Rolando; Essinger-Hileman, Thomas; Fluxá, Pedro; Gothe, Dominik; Haridas, Saianeesh K.; Harrington, Kathleen; Iuliano, Jeffrey; Karakla, John; Marriage, Tobias A.; Miller, Nathan J.; Núñez, Carolina; Parker, Lucas; Petroff, Matthew A.; Reeves, Rodrigo; Rostem, Karwan; Stevens, Robert W.; Nunes Valle, Deniz Augusto; Watts, Duncan J.; Weiland, Janet L.; Wollack, Edward J.; Xu, Zhilei (2020-02-01)
    We report measurements of circular polarization from the first two years of observation with the 40 GHz polarimeter of the Cosmology Large Angular Scale Surveyor (CLASS). CLASS is conducting a multi-frequency survey ...