Kiana Kade (Chalmers University of Technology): Understanding the environment and ISM of massive galaxies at high-z through emission line studies - the case of BRI0952-0115 and AzTEC-3

Thursday 16 Nov 2023, 14:00 → 15:00 Europe/Stockholm

90103Å

Title: Understanding the environment and ISM of massive galaxies at high-z through emission line studies - the case of BRI0952-0115 and AzTEC-3 
Speaker: Kiana Kade
Affiliation: Chalmers University of Technology
Time: Thursday 16 November 2023, 1400 to 1500
Location: 90103Å

 

Abstract: The process of massive galaxy evolution at high redshift is poorly understood, including the co-evolution of central supermassive black hole and stellar mass, and the effects of the black hole on the host galaxy. Similarly, the effect of  mergers and feedback, as well as the galaxy’s environment is still unknown at high redshift. 

In this talk I will present the case of two extreme galaxies at high redshift (AzTEC-3 at z=5.3 and BRI0952-0115 at z=4.432) using deep, high-resolution ALMA band 7 observations. We find complex broad emission line profiles in the [CII] line structure of both sources, indicating the presence of outflows. Within a radius of approximately 19 kpc, we detect companion sources in [CII] emission surrounding both galaxies, with one showing a possible fueling mechanism in the form of a 'gas bridge' structure. In addition, by combining band 7 data and ancillary ALMA archival data, we detect multiple emission lines including [CI], CO, H2O, OH, and OH+ in the quasar BRI0952-0115, allowing for an in-depth study of excitation mechanisms within the ISM and an investigation of the interplay between the AGN and star formation. I will present radiative transfer modelling results using MOLPOP-CEP and discuss our results as well as the limitations of the data. I will also compare our results to recent studies of AGN host galaxies at z~3-5 and discuss the potential for furthering our understanding of high-z galaxy ISM and environment.