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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We use the latest version of the metal line absorption catalogue of Zhu &M\'enard (2013) to study the clustering of MgII absorbers around massivegalaxies (~10^11.5 M_sun), quasars and radio-loud AGN with redshifts between0.4 and 0.75. Clustering is evaluated in two dimensions, by binning absorbersboth in projected radius and in velocity separation. Excess MgII is detectedaround massive galaxies out to R_p=20 Mpc. At projected radii less than 800kpc, the excess extends out to velocity separations of 10,000 km/s. The extentof the high velocity tail within this radius is independent of the mean stellarage of the galaxy and whether or not it harbours an active galactic nucleus. Weinterpret our results using the publicly available Illustris and Millenniumsimulations. Models where the MgII absorbers trace the dark matter particle orsubhalo distributions do not fit the data. They overpredict the clustering onsmall scales and do not reproduce the excess high velocity separation MgIIabsorbers seen within the virial radius of the halo. The Illustris simulationswhich include thermal, but not mechanical feedback from AGN, also do notprovide an adequate fit to the properties of the cool halo gas within thevirial radius. We propose that the large velocity separation MgII absorberstrace gas that has been pushed out of the dark matter halos, possibly bymultiple episodes of AGN-driven mechanical feedback acting over longtimescales.

Clustering of MgII absorption line systems around massive galaxies: an important constraint on feedback processes in galaxy formation