Sep 17, 2020

Professor Emeritus Jay Gallagher, UW Madison Astronomy Dept

"9/17/2020 - Astronomy Colloquium - ” Evolutionary Rhythms in the Dark Hearts of Galaxies”."

The central regions of giant disk galaxies, within radii of ~0.5 kpc, display a huge variety of conditions ranging from extreme starbursts to dead, red spheroids. Many such regions contain concentrations of dense gas and are examples of central molecular zones (CMZs).  In this talk I will review my group's studies of the properties of CMZs in normal spirals and interacting galaxies. Our studies include explorations of ionized gas properties and kinematics from optical spectra taken with SALT and WIYN as well infrared-millimeter wavelength investigations of gas content and star formation that are designed to overcome the effects of dust obscuration.  We find profound effects of dust obscuration in many CMZs. Dust obscures star formation from optical view in many normal spirals, while the most extreme cases the dust is optically thick to wavelengths of ~1 mm, thereby completely hiding the central engines of some galaxies across much of the electromagnetic spectrum. The second half of my talk will focus on properties of extreme galaxies with compact obscured nuclei (CONs) that are being explored through multi-wavelength observations and ALMA molecular line maps obtained by the international collaboration led by S. Aalto (Chalmers University)

Topic: Colloquium - Jay Gallagher
Time: Sep 17, 2020 03:00 PM Central Time (US and Canada)

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Event Details

Sep 17, 2020



Tea at 3:30 pm Talk begins at 3:45 pm.See abstract for Zoom information

Speaker Host:
Richard Townsend, Astronomy Chair

UW-Madison Astronomy Home