[Crib-list] SPEAKER: Kaley Virginia Brauer (MIT) -- Friday, Oct. 1, 2021 -- 12:00 Noon - 1:00 PM

[Shirley Entzminger]

 		    COMPUTATIONAL RESEARCH in BOSTON and BEYOND SEMINAR
                                             (CRIBB)


ZOOM MEETING info:

 	https://mit.zoom.us/j/96155042770

 	Meeting ID: 961 5504 2770

-------------------------------------------------

DATE:	Friday, October 1, 2021

TIME:	12:00 Noon to 1:00 PM


TItLE:	Galactic Archaeology:
 	Investigating Galactic Evolution through Ancient Stars & Galaxies



SPEAKER:  KALEY VIRGINIA BRAUER (MIT)


ABSTRACT:

Just like traditional archaeologists who study the history of humanity 
through ancient artifacts, galactic archaeologists study the history of 
our galaxy through ancient stars and dwarf galaxies that still survive 
today. This talk will briefly cover several galactic archaeology projects 
and describe how we are able to use simulations to interpret observations 
of ancient stars and galaxies.

The motions and chemical composition of the stars currently present in the 
extended outskirts (the stellar halo) of a galaxy preserve a record of the 
galaxy’s formation history. While most of the stars in the center and disk 
of a galaxy formed in situ, many of the stars in the stellar halo 
originated in the many small galaxies that the central host galaxy 
accreted over billions of years. Currently, though, we lack ways to 
identify which halo stars originated in which dwarf galaxies or even 
reliably identify which stars were accreted. By utilizing the Caterpillar 
simulation suite, a suite of 32 Milky Way-mass galaxies forming, we find 
that stars with strong enrichment of certain chemical elements (e.g., 
r-process elements) may have preferentially formed in the smallest dwarf 
galaxies that merged into the Milky Way. We also quantify how well 
astronomers can kinematically identify stars that accreted together from 
these dwarf galaxies. Looking forward, we will expand on this work with 
several more detailed simulations of dwarf galaxies and how r-process 
elements mix into interstellar gas.

================================================

Massachusetts Institute of Technology
Cambridge, MA  02139


For information about the CRIBB Seminar, please visit:

 	https://math.mit.edu/sites/crib/


Seminar will be virtual.  ZOOM Info is at the top of this page, on the attached
poster and on the CRIBB website:


Please contact me if you have any questions.

===

Shirley A. Entzminger
Administrative Assistant II
Department of Mathematics
Massachusetts Institute of Technology
77 Massachusetts Avenue
Building 2, Room 350A
Cambridge, MA 02139
PHONE: 	(617) 253-4994
E-mail:	daisymae at math.mit.edu
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