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

We present a spectroscopic sample of  z ≈ 0.5 luminous red galaxies (LRGs) that are located within physical projected distances  of a quasi‐stellar object (QSO) sightline. Of the 37 LRGs in our sample, eight have associated Mg  ii  absorbers with rest‐frame equivalent width   W  r (2796)&gt;0.3  Å and velocity separation  km s −1  and 29 do not have associated Mg  ii  absorbers to a 2σ limit of   W  r (2796)=0.3  Å. We perform a stellar population synthesis analysis using stacked spectra of the Mg  ii  absorbing and non‐absorbing LRG subsamples. We find that LRGs with or without associated Mg  ii  absorbers share similar star formation histories and are best described by old stellar population models (≳1 Gyr). Younger stellar populations (≲1 Gyr) fail to reproduce their spectra. These findings are consistent with the lack of [O  ii ] emission features in the LRG spectra. The primarily old stellar populations in the LRGs indicate that starburst‐driven outflows are unlikely to explain the observed Mg  ii  absorbers at large distances from the LRGs. In addition, the spectroscopic LRG sample allows us to derive a sensitive constraint for the cool gas covering fraction of 〈κ〉= 14 ± 6 per cent in the LRG haloes for absorbers of   W  r (2796)&gt;0.3  Å. Finally, we speculate on the origin of the observed Mg  ii  absorbers around the LRGs.

The star formation history of luminous red galaxies hosting Mg ii absorbers ★