Analysis of Polarized Dust Emission Using Data from the First Flight of SPIDER

Journal Article · 03 January 2025 · The Astrophysical Journal

DOI: https://doi.org/10.3847/1538-4357/ad900c · OSTI ID:2533567

Ade, P. R.; Amiri, M.; Benton, S. J. ; Bergman, A. S.; Bihary, R.; Bock, J. J.; Bond, J. R. ; Bonetti, J. A.; Bryan, S. A.; Chiang, H. C.; Contaldi, C. R. ; Doré, O.; Duivenvoorden, A. J. ; Eriksen, H. K.; Filippini, J. P. ; Fraisse, A. A.; Freese, K.; Galloway, M.; Gambrel, A. E.; Gandilo, N. N. ; Ganga, K.; Gourapura, S. ; Gualtieri, R. ; Gudmundsson, J. E. ; Halpern, M.; Hartley, J. ; Hasselfield, M.; Hilton, G.; Holmes, W.; Hristov, V. V.; Huang, Z. ; Irwin, K. D. ; Jones, W. C. ; Karakci, A.; Kuo, C. L.; Kermish, Z. D.; Leung, J. S.-Y. ; Li, S. ; Mak, D. Y.; Mason, P. V.; Megerian, K.; Moncelsi, L.; Morford, T. A.; Nagy, J. M. ; Netterfield, C. B.; Nolta, M.; O’Brient, R.; Osherson, B.; Padilla, I. L. ; Racine, B.; Rahlin, A. S. ; Reintsema, C.; Ruhl, J. E. ; Runyan, M. C.; Ruud, T. M. ; Shariff, J. A.; Shaw, E. C. ; Shiu, C. ; Soler, J. D.; Song, X.; Trangsrud, A.; Tucker, C.; Tucker, R. S.; Turner, A. D.; van der List, J. F.; Weber, A. C.; Wehus, I. K. ; Wiebe, D. V.; Young, E. Y.

Using data from the first flight of Spider and from the Planck High Frequency Instrument, we probe the properties of polarized emission from interstellar dust in the Spider observing region. Component-separation algorithms operating in both the spatial and harmonic domains are applied to probe their consistency and to quantify modeling errors associated with their assumptions. Analyses of diffuse Galactic dust emission spanning the full Spider region demonstrate (i) a spectral energy distribution that is broadly consistent with a modified-blackbody (MBB) model with a spectral index of β_d = 1.45 ± 0.05 (1.47 ± 0.06) for E (B)-mode polarization, slightly lower than that reported by Planck for the full sky; (ii) an angular power spectrum broadly consistent with a power law; and (iii) no significant detection of line-of-sight polarization decorrelation. Tests of several modeling uncertainties find only a modest impact (~10% in σ_r) on Spider's sensitivity to the cosmological tensor-to-scalar ratio. The size of the Spider region further allows for a statistically meaningful analysis of the variation in foreground properties within it. Assuming a fixed dust temperature T_d = 19.6 K, an analysis of two independent subregions of that field results in inferred values of β_d = 1.52 ± 0.06 and β_d = 1.09 ± 0.09, which are inconsistent at the 3.9σ level. Furthermore, a joint analysis of Spider and Planck 217 and 353 GHz data within one subregion is inconsistent with a simple MBB at more than 3σ, assuming a common morphology of polarized dust emission over the full range of frequencies. This evidence of variation may inform the component-separation approaches of future cosmic microwave background polarization experiments.

• Research Organization: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Contributing Organization: SPIDER Collaboration
• Grant/Contract Number: AC02-76SF00515; SC0007859
• OSTI ID: 2533567
• Journal Information: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 978; ISSN 0004-637X
• Publisher: IOP PublishingCopyright Statement
• Country of Publication: United States
• Language: English