2018/01/21 by Chen Song, Chen, Song · 1 citation
Engineering · Physics and Astronomy · #Adaptive optics and wavefront sensing #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #GNSS positioning and interference #Radio Astronomy Observations and Technology
paper · pdf · doi:10.48550/arxiv.1801.06829
openalex publication_date 2018/01/21 · openalex created_date 2018/02/02 · openalex updated_date 2026/07/28
In this paper, I investigated the Doppler magnification effect in the flux-limited galaxy number counts with finite redshift bin width. In contradiction with our intuition, the number counts correction formula for different redshift bin are different. For the redshift window as delta function and constant function, the correction formulas have been derived analytically in this paper. These two windows correspond to two extreme cases(i.e. extremely narrow bin and extremely broad bin). An simulation have been implemented to test these formulas. The simulation results indicate the perturbation changes smoothly from one extreme case to another while extending the redshift bin width from half bin width 0.05 to 0.4. As a result, Doppler magnification caused number counts perturbation of finite redshift bin width can NOT be compute via redshift integration of the perturbation formula derived with delta function redshift window. It is only a good approximation when the bin width is small. These results are important for galaxy redshift survey kinematic dipole estimation, and meaningful for the relativistic galaxy number counts angular power spectrum estimation, such as CLASSgal and CAMB source.