TY - JOUR
T1 - Detectability of Galactic Faraday Rotation in multiwavelength CMB observations
T2 - A cross-correlation analysis of CMB and radio maps
AU - Kolopanis, Matthew
AU - Mauskopf, Philip
AU - Bowman, Judd
N1 - Funding Information:
This research has been supported by Arizona State University. We would like to thank Soma De, Tanmay Vachaspati, Daniel C. Jacobs, Adam Beardsley and Samuel Gordon for their insightful conversations. Some of the results in this paper have been derived using the HEALPIX (Górski et al. 2005) package. This research made use of
Publisher Copyright:
© 2018 The Author(s).
PY - 2018/2/1
Y1 - 2018/2/1
N2 - We introduce a new cross-correlation method to detect and verify the astrophysical origin of Faraday Rotation (FR) inmultiwavelength surveys. FR is well studied in radio astronomy from radio point sources but the λ2 suppression of FR makes detecting and accounting for this effect difficult at millimeter and sub-millimeter wavelengths. Therefore, statistical methods are used to attempt to detect FR in the cosmic microwave background (CMB). Most estimators of the FR power spectrum rely on single-frequency data. In contrast, we investigate the correlation of polarized CMB maps with FR measure maps from radio point sources. We show a factor of ~30 increase in sensitivity over single-frequency estimators and predict detections exceeding 10σ significance for a CMB-S4-like experiment. Improvements in observations of FR from current and future radio polarization surveyswill greatly increase the usefulness of thismethod.
AB - We introduce a new cross-correlation method to detect and verify the astrophysical origin of Faraday Rotation (FR) inmultiwavelength surveys. FR is well studied in radio astronomy from radio point sources but the λ2 suppression of FR makes detecting and accounting for this effect difficult at millimeter and sub-millimeter wavelengths. Therefore, statistical methods are used to attempt to detect FR in the cosmic microwave background (CMB). Most estimators of the FR power spectrum rely on single-frequency data. In contrast, we investigate the correlation of polarized CMB maps with FR measure maps from radio point sources. We show a factor of ~30 increase in sensitivity over single-frequency estimators and predict detections exceeding 10σ significance for a CMB-S4-like experiment. Improvements in observations of FR from current and future radio polarization surveyswill greatly increase the usefulness of thismethod.
KW - Cosmic background radiation
KW - Cosmology: miscellaneous
KW - Methods: data analysis
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U2 - 10.1093/mnras/stx2632
DO - 10.1093/mnras/stx2632
M3 - Article
AN - SCOPUS:85046135912
SN - 0035-8711
VL - 473
SP - 4795
EP - 4804
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -