Constraints on the high-ℓ power spectrum of millimeter-wave anisotropies from APEX-SZ

dc.creatorDANIEL FERRUSCA RODRIGUEZ
dc.date2009-08-22
dc.date.accessioned2023-07-25T16:23:29Z
dc.date.available2023-07-25T16:23:29Z
dc.identifierhttp://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1348
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7806544
dc.descriptionWe present measurements of the angular power spectrum of millimeter wave anisotropies with the APEX-SZ instrument. APEX-SZ has mapped 0.8 square degrees of sky at a frequency of 150 GHz with an angular resolution of 1´. These new measurements significantly improve the constraints on anisotropy power at 150 GHz over the range of angular multipoles 3000 < ℓ < 10; 000, limiting the total astronomical signal in a at band power to be less than 105 µK² at 95% CL. We expect both submillimeter-bright, dusty galaxies and to a lesser extent secondary CMB anisotropies from the Sunyaev-Zel'dovich effect (SZE) to significantly contribute to the observed power. Subtracting the SZE power spectrum expected for σ₈ = 0:8 and masking bright sources, the best fit value for the remaining power is Cℓ = 1.1⁺⁰·⁹₋₀.₈ x10⁻⁵µK² (1.7⁺¹·⁴₋₁.₃ Jy² sr⁻¹). This agrees well with model predctions for power due to submillimeter-bright, dusty galaxies. Comparing this power to the power detected by BLAST at 600 GHz, we find the frequency dependence of the source uxes to be Sv ∝ v²·⁶⁺⁰·⁴ ₋₀.₂ if both experiments measure the same population of sources. Simultaneously fitting for the amplitude of the SZE power spectrum and a Poisson distributed point source population, we place an upper limit on the matter uctuation amplitude of σ₈ < 1.18 at 95% confidence.
dc.formatapplication/pdf
dc.languageeng
dc.publisherThe Astrophysical Journal
dc.relationcitation:Reichardt, C. L., et al., (2009). Constraints on the high-ℓ power spectrum of millimeter-wave anisotropies from APEX-SZ, The Astrophysical Journal, Vol.701(2):1-9
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0
dc.subjectinfo:eu-repo/classification/Inspec/Cosmic microwave background
dc.subjectinfo:eu-repo/classification/Inspec/Cosmology:observations
dc.subjectinfo:eu-repo/classification/Inspec/Cosmology: cosmological parameters
dc.subjectinfo:eu-repo/classification/Inspec/Infrared: galaxies
dc.subjectinfo:eu-repo/classification/cti/1
dc.subjectinfo:eu-repo/classification/cti/21
dc.subjectinfo:eu-repo/classification/cti/21
dc.titleConstraints on the high-ℓ power spectrum of millimeter-wave anisotropies from APEX-SZ
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/acceptedVersion
dc.audiencestudents
dc.audienceresearchers
dc.audiencegeneralPublic


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