1. Results from the Atacama B-mode Search (ABS) Experiment
- Author
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Sara M. Simon, Norman Jarosik, Matthew Hasselfield, Steve K. Choi, S. P. Ho, K. W. Yoon, Gene C. Hilton, Gonzalo A. Palma, Kent D. Irwin, Michael R. Nolta, J. W. Appel, Hsiao-Mei Cho, Michael D. Niemack, Carl D. Reintsema, Jonathan Sievers, Akito Kusaka, Lucas Parker, Joseph W. Fowler, Suzanne T. Staggs, Luis E. Campusano, G. W. Nixon, Thomas Essinger-Hileman, James A. Beall, Kevin T. Crowley, Katerina Visnjic, Patricio A. Gallardo, Lyman A. Page, and Srinivasan Raghunathan
- Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,media_common.quotation_subject ,Cosmic microwave background ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,7. Clean energy ,01 natural sciences ,Electromagnetic radiation ,symbols.namesake ,0103 physical sciences ,Atacama B-Mode Search ,Planck ,010306 general physics ,010303 astronomy & astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,media_common ,Cosmic dust ,Physics ,Astrophysics::Instrumentation and Methods for Astrophysics ,Astronomy and Astrophysics ,Polarization (waves) ,13. Climate action ,Sky ,symbols ,Astrophysics - Instrumentation and Methods for Astrophysics ,Right ascension ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
The Atacama B-mode Search (ABS) is an experiment designed to measure cosmic microwave background (CMB) polarization at large angular scales ($\ell>40$). It operated from the ACT site at 5190~m elevation in northern Chile at 145 GHz with a net sensitivity (NEQ) of 41 $��$K$\sqrt{\rm s}$. It employed an ambient-temperature sapphire half-wave plate rotating at 2.55 Hz to modulate the incident polarization signal and reduce systematic effects. We report here on the analysis of data from a 2400 deg$^2$ patch of sky centered at declination $-42^\circ$ and right ascension $25^\circ$. We perform a blind analysis. After unblinding, we find agreement with the Planck TE and EE measurements on the same region of sky. We marginally detect polarized dust emission and give an upper limit on the tensor-to-scalar ratio of $r, 38 pages, 11 figures
- Published
- 2018
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