2016/02/09 by Alvise Raccanelli, Raccanelli, Alvise, Daniele Bertacca +7 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Scientific Research and Discoveries
paper · pdf · doi:10.48550/arxiv.1602.03186
openalex publication_date 2016/02/09 · openalex created_date 2022/10/04 · openalex updated_date 2026/07/28
We study the parity-odd part (that we shall call Doppler term) of the linear\ngalaxy two-point correlation function that arises from wide-angle, velocity,\nDoppler lensing and cosmic acceleration effects. As it is important at low\nredshift and at large angular separations, the Doppler term is usually\nneglected in the current generation of galaxy surveys. For future wide-angle\ngalaxy surveys such as Euclid, SPHEREx and SKA, however, we show that the\nDoppler term must be included. The effect of these terms is dominated by the\nmagnification due to relativistic aberration effects and the slope of the\ngalaxy redshift distribution and it generally mimics the effect of the local\ntype primordial non-Gaussianity with the effective nonlinearity parameter\nf rm NL rm eff of a few, we show that this would affect forecasts on\nmeasurements of f rm NL at low-redshift. Our results show that a survey at\nlow redshift with large number density over a wide area of the sky could detect\nthe Doppler term with a signal-to-noise ratio of \∼ 1-20, depending on\nsurvey specifications.\n