The Completed SDSS-IV Extended Baryon Oscillation Spectroscopic Survey : Baryon Acoustic Oscillations with Lyα Forests Article - 2020

Helion Du Mas Des Bourboux, James Rich, Andreu Font-Ribera, Victoria de Sainte Agathe, James Farr, Thomas Etourneau, Jean-Marc Le Goff, Andrei Cuceu, Christophe Balland, Julian E. Bautista, Michael Blomqvist, Jonathan Brinkmann, Joel R. Brownstein, Solene Chabanier, Edmond Chaussidon, Kyle Dawson, Alma X. Gonzalez-Morales, Julien Guy, Brad W. Lyke, Axel de la Macorra, Eva-Maria Mueller, Adam D. Myers, Christian Nitschelm, Andrea Munoz Gutierrez, Nathalie Palanque-Delabrouille, James Parker, Will J. Percival, Ignasi Perez-Rafols, Patrick Petitjean, Matthew M. Pieri, Corentin Ravoux, Graziano Rossi, Donald P. Schneider, Hee-Jong Seo, Anze Slosar, Julianna Stermer, M. Vivek, Christophe Yeche, Samantha Youles

Helion Du Mas Des Bourboux, James Rich, Andreu Font-Ribera, Victoria de Sainte Agathe, James Farr, Thomas Etourneau, Jean-Marc Le Goff, Andrei Cuceu, Christophe Balland, Julian E. Bautista, Michael Blomqvist, Jonathan Brinkmann, Joel R. Brownstein, Solene Chabanier, Edmond Chaussidon, Kyle Dawson, Alma X. Gonzalez-Morales, Julien Guy, Brad W. Lyke, Axel de la Macorra, Eva-Maria Mueller, Adam D. Myers, Christian Nitschelm, Andrea Munoz Gutierrez, Nathalie Palanque-Delabrouille, James Parker, Will J. Percival, Ignasi Perez-Rafols, Patrick Petitjean, Matthew M. Pieri, Corentin Ravoux, Graziano Rossi, Donald P. Schneider, Hee-Jong Seo, Anze Slosar, Julianna Stermer, M. Vivek, Christophe Yeche, Samantha Youles, « The Completed SDSS-IV Extended Baryon Oscillation Spectroscopic Survey : Baryon Acoustic Oscillations with Lyα Forests  », Astrophys.J., 2020, p. 153

Abstract

We present a measurement of baryonic acoustic oscillations (BAOs) from Lyα absorption and quasars at an effective redshift using the complete extended Baryonic Oscillation Spectroscopic Survey (eBOSS). The 16th and final eBOSS data release (SDSS DR16) contains all data from eBOSS and its predecessor, the Baryonic Oscillation Spectroscopic Survey (BOSS), providing 210,005 quasars with z q > 2.10 that are used to measure Lyα absorption. We measure the BAO scale both in the autocorrelation of Lyα absorption and in its cross-correlation with 341,468 quasars with redshift z q > 1.77. Apart from the statistical gain from new quasars and deeper observations, the main improvements over previous work come from more accurate modeling of physical and instrumental correlations and the use of new sets of mock data. Combining the BAO measurement from the auto- and cross-correlation yields the constraints of the two ratios and , where the error bars are statistical. These results are within 1.5σ of the prediction of the flat-ΛCDM cosmology of Planck (2016). The analysis code, picca, the catalog of the flux transmission field measurements, and the Δχ 2 surfaces are publicly available.

Voir la notice complète sur HAL

Actualités