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Appel, John W.; Xu 徐, Zhilei 智磊; Padilla, Ivan L.; Harrington, Kathleen; Marquez, Bastián Pradenas; Ali, Aamir; Bennett, Charles L.; Brewer, Michael K.; Bustos, Ricardo; Chan, Manwei; Chuss, David T.; Cleary, Joseph; Couto, Jullianna; Dahal, Sumit; Denis, Kevin; Dünner, Rolando; Eimer, Joseph R.; Essinger-Hileman, Thomas; Fluxa, Pedro; Gothe, Dominik; Hilton, Gene C.; Hubmayr, Johannes; Iuliano, Jeffrey; Karakla, John; [...]

On-sky Performance of the CLASS Q-band Telescope

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  • Media type: E-Article
  • Title: On-sky Performance of the CLASS Q-band Telescope
  • Contributor: Appel, John W.; Xu 徐, Zhilei 智磊; Padilla, Ivan L.; Harrington, Kathleen; Marquez, Bastián Pradenas; Ali, Aamir; Bennett, Charles L.; Brewer, Michael K.; Bustos, Ricardo; Chan, Manwei; Chuss, David T.; Cleary, Joseph; Couto, Jullianna; Dahal, Sumit; Denis, Kevin; Dünner, Rolando; Eimer, Joseph R.; Essinger-Hileman, Thomas; Fluxa, Pedro; Gothe, Dominik; Hilton, Gene C.; Hubmayr, Johannes; Iuliano, Jeffrey; Karakla, John; [...]
  • imprint: American Astronomical Society, 2019
  • Published in: The Astrophysical Journal
  • Language: Not determined
  • DOI: 10.3847/1538-4357/ab1652
  • ISSN: 0004-637X; 1538-4357
  • Keywords: Space and Planetary Science ; Astronomy and Astrophysics
  • Origination:
  • Footnote:
  • Description: <jats:title>Abstract</jats:title> <jats:p>The Cosmology Large Angular Scale Surveyor (CLASS) is mapping the polarization of the cosmic microwave background (CMB) at large angular scales (2 &lt; <jats:italic>ℓ</jats:italic> ≲ 200) in search of a primordial gravitational wave B-mode signal down to a tensor-to-scalar ratio of <jats:italic>r</jats:italic> ≈ 0.01. The same data set will provide a near sample-variance-limited measurement of the optical depth to reionization. Between 2016 June and 2018 March, CLASS completed the largest ground-based <jats:italic>Q</jats:italic>-band CMB survey to date, covering over 31,000 square-degrees (75% of the sky), with an instantaneous array noise-equivalent temperature sensitivity of <jats:inline-formula> <jats:tex-math> <?CDATA $32\,\mu {{\rm{K}}}_{\mathrm{cmb}}\sqrt{{\rm{s}}}$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1652ieqn1.gif" xlink:type="simple" /> </jats:inline-formula>. We demonstrate that the detector optical loading (1.6 pW) and noise-equivalent power (19 <jats:inline-formula> <jats:tex-math> <?CDATA $\mathrm{aW}\sqrt{{\rm{s}}}$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1652ieqn2.gif" xlink:type="simple" /> </jats:inline-formula>) match the expected noise model dominated by photon bunching noise. We derive a 13.1 ± 0.3 K pW<jats:sup>−1</jats:sup> calibration to antenna temperature based on Moon observations, which translates to an optical efficiency of 0.48 ± 0.02 and a 27 K system noise temperature. Finally, we report a Tau A flux density of 308 ± 11 Jy at 38.4 ± 0.2 GHz, consistent with the <jats:italic>Wilkinson Microwave Anisotropy Probe</jats:italic> Tau A time-dependent spectral flux density model.</jats:p>
  • Access State: Open Access