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

The extent of the effect of active galactic nuclei (AGN) on their hostgalaxies at high-redshift is not apparent and studying this effect in thedistant universe is a difficult process as the mechanisms of tracing AGNactivity can often be inaccurately associated with intense star formation andvice versa. Our aim is to better understand the processes governing theinterstellar medium (ISM) of the quasar BRI0952-0952 at z = 4.432, specificallywith regard to the individual heating processes at work and to place the quasarin an evolutionary context. We analyzed ALMA archival bands 3, 4, and 6 dataand combined the results with high-resolution band-7 ALMA observations of thequasar. We detect [C I] (2-1), [C II], CO(5-4), CO(7-6), CO(12-11), OH, H2O,and we report a tentative detection of OH+. We update the lensing model fromKade et al. (2023) and use the radiative transfer code MOLPOP-CEP to constrainthe properties of the CO, [CI], and [CII] emission and suggest differentpossible scenarios for heating mechanisms within the quasar. Modeling from theCO SLED suggests that there are extreme heating mechanisms operating within thequasar in the form of star formation or AGN activity; however, with the currentdata it remains unclear which of the two is the preferred mechanism. Theupdated lensing model suggests a velocity gradient across the [C II] line,suggestive of on-going kinematical processes within the quasar. We find thatthe H2O emission in BRI0952 is likely correlated with star-forming regions ofthe ISM. We use the molecular gas mass from [C I] to calculate a depletion timefor the quasar. We conclude that BRI 0952-0952 is a quasar with a significantAGN contribution while also showing signs of extreme starburst activity,indicating that the quasar could be in a transitional phase between astarburst-dominated stage and an AGN-dominated stage.

Probing the interstellar medium of the quasar BRI0952-0115, an analysis of [CII], [CI], CO, OH, and H2O