Sep 28, 2017

Adam Schaefer, UW-Madison- Astronomy Dept

"Resolving the signatures of environment quenching with SAMI"

The environments in which galaxies exist are known to influence their structure and evolution. In particular, galaxies in rich environments tend to have lower rates of star formation than their more isolated counterparts. This phenomenon is called environment quenching. In this talk I will present data from the Sydney-Australian Astronomical Observatory Multi-object Integral Field Spectrograph (SAMI) galaxy survey to shed light on the mechanisms that shut down star formation in galaxy groups.

Our data show that the environment quenching of galaxies takes place in groups more massive than ~3x10^12 solar masses, and that this quenching appears to act from the outside-in. Measurements of the stellar population age gradients imply a timescale of at least ~1 Gyr for the complete cessation of star formation by this process. We suggest weak ram pressure from the intragroup medium may explain the observed distribution of star formation in quenching galaxies. In less dense environments the distribution of star formation is consistent with the starvation of the supply of new gas into galaxies.

Event Details

Sep 28, 2017


4421 Sterling Hall

Coffee served at 3:30pm; talk starts at 3:45pm

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