Detection of massive molecular and dust reservoirs around z~2 extremely red quasars: CGM enrichment by quasar-driven outflows

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• Jan Scholtz (University of Cambridge)
• Wednesday 27 April 2022, 13:45-14:15
• The Hoyle Lecture Theatre + Zoom .

If you have a question about this talk, please contact Hannah Uebler.

Large scale outflows are believed to be an important mechanism in the evolution of galaxies, as they can both suppress and enhance star formation as well as eject gas from their host galaxies and mix the pristine gas from the intergalactic medium and processed material from the galaxy in the circum-galactic medium (CGM). We can study the impact of these large-scale outflows either by tracing the current outflows (by studying broad emission line profiles), or by studying the impact of past outflows on the gas surrounding the galaxy. In this work, we examined the CO(7-6), [CI](2-1), H2O (806 GHz) and dust continuum ALMA observations of 15 extremely red quasars (eRQSOs) at z=2.3. By investigating the radial surface brightness profiles of both the individual sources and the stacked emission, we detect extended cold gas and dust emission on scales of ca. 14 kpc in CO(7-6), [CI](2-1), and dust continuum. We have further confirmed our results by investigating the visibilities of individual targets and the stacked visibilities. In this talk, I will compare the measured sizes and dust and cold gas masses of our detected halos with those from previous studies of cold gas halos around star-forming galaxies across redshifts 2-4 and discuss the impact of large scale outflows on the CGM around extremely powerful quasars.

This talk is part of the Institute of Astronomy Seminars series.

This talk is included in these lists:

• Cambridge Astronomy Talks
• Combined External Astrophysics Talks DAMTP
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• Cosmology, Astrophysics and General Relativity
• Institute of Astronomy Seminars
• Institute of Astronomy Talk Lists
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• The Hoyle Lecture Theatre + Zoom

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