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http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1348| Constraints on the high-ℓ power spectrum of millimeter-wave anisotropies from APEX-SZ | |
| DANIEL FERRUSCA RODRIGUEZ | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| Cosmic microwave background Cosmology:observations Cosmology: cosmological parameters Infrared: galaxies | |
| We 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. | |
| The Astrophysical Journal | |
| 22-08-2009 | |
| Artículo | |
| Inglés | |
| Estudiantes Investigadores Público en general | |
| 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 | |
| ASTRONOMÍA Y ASTROFÍSICA | |
| Versión aceptada | |
| acceptedVersion - Versión aceptada | |
| Aparece en las colecciones: | Artículos de Astrofísica |
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