A giant Mahalo Nui Loa to Ph.D. candidate Alexandre Bouquin of the Universidad Complutense de Madrid. As an alumni from the 2004 graduating class, he was kind enough to talk about his current research and meet with students interested in graduate school. Thank you Professor Takamiya for the student food (pizza's).


Alexandre Bouquin




Please join us for a UHH Alumni talk on December 9th, 12-1pm in the STB-210, conference room.    Hope to see everyone then!  Rumor has it there will be pizzas for our students courtesy of Dr. Takamiya!  Please be sure to come and see how your alumni are doing in graduate school!


December 9, 2013 at 12:00 pm, ST-210 conference room
Talk by Alexandre Bouquin PhD student at Universidad Complutense de Madrid, former UHH astronomy student will be giving a talk entitled:  "Environmental and morphological type segregation on the evolution of galaxies out of the blue sequence"

Abstract: We have obtained GALEX UV radial surface brightness and color profiles, as well as integrated magnitudes for +1500 galaxies covering ∼70% of the S4G/DAGAL volume-limited sample of nearby galaxies (d<40Mpc), and combined these with Spitzer/IRAC-3.6um photometry. The analysis of the (FUV-NUV) vs (NUV-3.6um) color-color diagram reveals both a so-called "blue sequence", where Irr through Sb”s are located, and a "red cloud", where E/S0 reside. This is opposite to the morphology seen in optical CMDs and it mostly due to the degeneracies between SFH of disk galaxies and dust extinction (which strongly correlates the FUV-NUV and NUV- 3.6 colors) and could only be seen thanks to the statistics and wide range of galaxy masses and types provided by S4G/DAGAL. We find many early-type spirals evolving off (or into) this "blue sequence" towards (or from) the "red cloud" that we interpret as a sign of strangulation (or re- birth) of the star formation in these galaxies. Such processes lead to distinct FUV-NUV colors, as this color is very sensitive to recent changes in the star formation activity, compared to other colors (optical ones or even NUV-3.6). Special attention is paid to the dependence of this evolution with the morphological type and environment since these (more than simply the stellar mass) seem to determine which galaxies are currently evolving off the blue sequence.
Alexandre will be available to talk to all UHH students about his research and graduate life after Hilo.

Please contact Marianne Takamiya (mytakamiya@gmail.com)if you are interested in meeting Alexandre. We will have pizza for those attending the talk.