English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Artículo de publicación ISIWe report the finding of two large-scale structures of galaxies in a 40 x 35 arcmin(2) field embedded in a 25 deg(2) area where two 100 h(-1) Mpc-scale structures of quasars and Mg II absorbers at z similar or equal to 0.8 and z similar or equal to 1.2 have been previously detected. Using deep optical (V- and I-band) imaging, we are able to select high-redshift (0.5 less than or similar to z less than or similar to 1.3) early-type galaxies as those redder than the cluster red sequence at z = 0.5 and having I < 23.5. Through comparison with a 35 x 35 arcmin(2) control field, we find a 30% excess of these red galaxies, corresponding to 563 galaxies across the field. The colour distribution of the excess galaxies shows a coherent peak at 2.7 < V - I < 3.1 and the magnitude distribution is well described by a Schechter function, showing unambiguously that the galaxy excess is primarily due to a population of early-type galaxies at z = 0.83 &PLUSMN; 0.08. In follow-up NIR imaging of the four best cluster candidates, we identify three clusters at z = 0.8 &PLUSMN; 0.1, each having well defined red sequences of &SIM;20 galaxies at I - K-s &SIME; 3.4, forming a structure 20 h(-1) Mpc across. The fourth candidate, corresponding to a previously identified cluster at z = 1.2 &PLUSMN; 0.1, is confirmed with 28 K-s < 20.5 galaxies having VIJK(s) colours consistent with passively-evolving galaxies at z similar or equal to 1.2 located within 1 arcmin of the cluster centre. In all four NIR fields we find numerous galaxies with the VIM, colours of passively-evolving galaxies both at z similar or equal to 0.8 and z similar or equal to 1.2, including regions well away from the clusters. The results of this study support the presence of two sheet-like large-scale galaxy structures extending across the 20-30 h(-1) Mpc scales explored by the optical data, one "sheet" at z similar or equal to 0.8 with three associated clusters, and a second "sheet" at z similar or equal to 1.2 with one embedded cluster. Our results confirm that, at least inside the probed region, the two known 100 h(-1) Mpc-scale structures at z similar to 1 of quasars and Mg II absorbers also mark out volumes with an enhanced density of galaxies. The finding of two galaxy structures at z similar or equal to 1 on scales of 20-30 h(-1) Mpc within much larger superstructures of quasars and Mg it absorbers, firstly establishes the presence of galaxy sheet-like structures at z similar to 1, and secondly, suggests that they may extend up to 100 h(-1) Mpc-scales

astronomy and astrophysics

Detection of 20–30 h$\mathsf{^{-1}}$ Mpc-scale galaxy structures embedded in 100 h$\mathsf{^{-1}}$ Mpc-scale structures of quasars and MgII absorbers at $\textit{z}\simeq\mathsf{0.8}$ and $\textit{z} \simeq\mathsf{1.2}$