Apr 20, 2017 4:00 pm - Nielsen Hall 170 - Colloquium
Katherine Alatalo - Carnegie Observatories
Shining light on the hidden pathways of galaxy transformation

The morphological and color bimodalities displayed by modern-day galaxies suggest that a galaxy must have rapidly transformed from one class to the other. In the modern universe, this transition is one-way, which makes it essential to gain a census of initial conditions capable of catalyzing this metamorphosis. Classical searches that capture transitioning galaxies via signatures of intermediate-aged stars and lack of nebular ionized gas emission exclude the very gas physics that are often fundamental to understanding the galaxy's transition. I will present the Shocked POststarburst Galaxy Survey (SPOGS), a novel method for finding previously-missed transitioning galaxies using their ionized gas line ratios. I will discuss early results suggesting my SPOGS criterion pinpoints objects at an earlier phase of transformation, when more signs of transition triggers still exist.  Our exquisite case study, NGC1266, demonstrates the success of this method. These new observations shed light on the fundamental role gas plays in the ultimate quenching and transformation of a galaxy.



Postcards from the Universe

Jul 19, 2018 7:00 pm

Sam Noble Museum of Natural History - Dr. Nate Kaib
The Solar System's Adolescent Years

Postcards from the Universe

Aug 16, 2018 7:00 pm

Sam Noble Museum of Natural History - Dr. John Wisniewski
The Search for Habitable Planets


Aug 23, 2018 4:00 pm

Nielsen Hall 170 - No Colloquium
1st week of Classes