Structure and evolution of cosmic voids within DESI DR1
Year: 2026
Type: article
Abstract: Ongoing Stage IV galaxy surveys such as DESI or Euclid offer an unprecedented amount of information to study the large-scale structure of the Universe by mapping tens of millions of galaxies. Within the context of cosmic voids, existing and future catalogues will improve our understanding of the void structure and evolution as well as the cosmological model constraints derived from their statistics. With the recent DESI Data Release 1, our aim is to obtain a new void catalogue that allows us to study the properties of cosmic voids at different redshifts, hence providing insight into not only their structure but also their evolution. We selected the DESI BGS and LRG samples for this study. Before the void-finding process, the data went through a preprocessing pipeline tackling redshift-space distortions and reconstructing the mildly non-linear velocity field. After that, the new void finder was applied to the preprocessed data, obtaining two void catalogues in different redshift bins (0.1<z<0.3 and 0.4<z<0.8), both within a 1400^3 , AVISM cMpc ^3 cube. We successfully recovered and clean voids with sizes up to sim70 , N_ = 1114 BGS N_ = 216 LRG cMpc . The void size function, 3D shape variables, density profiles, and linear bias were obtained and analysed. Both the resulting size function and the density profiles are in agreement with previous theoretical studies. The expected mass depletion in void evolution is shown by the evolution of density profiles. A constant linear bias inside r<R_e was obtained, with mean values of 1.31 ± 0.02 and 2.14 ± 0.04 for BGS and LRG voids, respectively. Both void catalogues are publicly released.
Source: Astronomy and Astrophysics
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
Awards: G4023665547, G6609259540, G7101460693
OpenAlex ID: W7221813285