Stimulated Feedback In Galaxies and Clusters

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• Brian McNamara (University of Waterloo, Canada)
• Thursday 21 April 2016, 16:00-17:00
• Sackler Lecture Theatre, IoA (tea at 3:30 pm).

If you have a question about this talk, please contact Simon Hodgkin.

Galaxy clusters are immersed in hot atmospheres shining X-rays. At their centres reside the largest galaxies in the universe. A significant fraction of central galaxies harbour molecular gas reservoirs exceeding 10^9 solar masses that are fuelling star formation at rates of tens of solar masses per year. New observations obtained with the Atacama Large Millimeter Array have revealed a diversity of molecular gas dynamics and morphologies including, inflow and outflow, and star formation occurring in filaments rather than in molecular disks. Molecular cloud ensemble velocities often lie far below the stellar velocity dispersions, approaching terminal rather than free-fall speeds. Observation indicates that molecular clouds are lifted by, and/or form, quickly in the wakes of buoyantly-rising radio bubbles. This mechanism may lead to circulating flows of hot and cold gas that sustains feedback in massive galaxies.

This talk is part of the Institute of Astronomy Colloquia 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 Colloquia
• Institute of Astronomy Talk Lists
• Kavli Institute for Cosmology Talk Lists
• Priscilla
• Sackler Lecture Theatre, IoA (tea at 3:30 pm)

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