2009/02/11 by A. Rassat, Anais Rassat, Rassat, Anais · 1 citation
Engineering · Physics and Astronomy · #Advanced Optical Sensing Technologies #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Optical Systems and Laser Technology #astro-ph.CO
paper · pdf · doi:10.48550/arxiv.0902.1759
6 pages. Submitted to Physical Review D
arxiv created 2009/02/11 · openalex publication_date 2009/02/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We show that linear redshift distortions in the galaxy distribution can affect the ISW galaxy-temperature signal, when the galaxy selection function is derived from a redshift survey. We find this effect adds power to the ISW signal at all redshifts and is larger at higher redshifts. Omission of this effect leads to an overestimation of the dark energy density ΩΛ as well as an underestimation of statistical errors. We find a new expression for the ISW Limber equation which includes redshift distortions, though we find that Limber equations for the ISW calculation are ill-suited for tomographic calculations when the redshift bin width is small. The inclusion of redshift distortions provides a new cosmological handle in the ISW spectrum, which can help constrain dark energy parameters, curvature and alternative cosmologies. Code is available on request and will soon be added as a module to the iCosmo platform (http://www.icosmo.org)