Calendar

Aug
30
Fri
Astro-ph Discussion
Aug 30 @ 11:30 am – 12:00 pm
Astro-ph Discussion @ AY119
Sep
4
Wed
Astro-ph Discussion
Sep 4 @ 1:30 pm – 2:00 pm
Astro-ph Discussion @ AY119
Sep
6
Fri
Astro-ph Discussion
Sep 6 @ 11:30 am – 12:00 pm
Astro-ph Discussion @ AY119
Observatory Open House
Sep 6 @ 8:00 pm – 9:30 pm
Observatory Open House @ BX102, Tombaugh Observatory

Host: Jason Jackiewicz. Assisted by David Decolibus, Sarah Kovac, Kelly Sanderson

Public talk at 8:00pm in Biology Annex 102 (NW corner of Williams and Stewart), followed by observing at the Tombaugh Observatory.

Sep
11
Wed
Astro-ph Discussion
Sep 11 @ 1:30 pm – 2:00 pm
Astro-ph Discussion @ AY119
Sep
12
Thu
Colloquium Thesis Proposal: Rachel Marra
Sep 12 @ 1:30 pm – 2:30 pm
Colloquium Thesis Proposal: Rachel Marra @ Jett Hall 210

An Observer’s Examination of the Circumgalactic Medium using Cosmological Simulations

Rachel Marra, NMSU

A significant aspect to understanding galaxy evolution is having an understanding of the intricacies involving the inflow and outflow of baryons onto a galaxy. Gas needs to accrete onto the galaxy in order for star formation to occur, while stellar winds, supernovae, and radiation pressure result in the outflow of gas from the galaxy. The diffuse region around the galaxy that has gas from interstellar medium (ISM) inflows and intergalactic medium (IGM) outflows interacting is the circumgalactic medium (CGM). Studying the CGM will help us learn about the baryon cycle and give us a better understanding of galactic evolution.

The primary method to studying the CGM is through absorption, as the density is too low to detect emission. Studying these absorption features allows us to learn about the physical properties of the gas giving rise to the absorption. Other than through observations, cosmological simulations play a large role in how we learn about the CGM of galaxies. Using MOCKSPEC, the Quasar Absorption Line Analysis Pipeline, to create mock quasar sightlines through the VELA simulation suite of galaxies, we use the absorption features seen in the sightlines to study the CGM in the simulations. While there are many ions that are used to study the CGM, we focus on OVI.

We intend to study how effective our methods are for studying the CGM with both observations and simulations. The covering fraction of OVI for a sample of observed galaxies will be compared with the covering fraction that is found from a selection of LOS that probe simulated, Milky-Way type galaxies. This tells us if the simulations can reproduce the observations, and if they do not, we can gain insights as to why the simulations do not match observed data. We will also investigate if the metallicity calculated from an observed absorption feature reflects the actual metallicity of the probed gas by using mock sightlines through simulations. Additionally, we will do a comparison of different methodologies used to study the CGM in simulations, to determine if using mock quasar sightlines is a more realistic and accurate method to compare to observed data.

Sep
13
Fri
Astro-ph Discussion
Sep 13 @ 11:30 am – 12:00 pm
Astro-ph Discussion @ AY119
Sep
18
Wed
Astro-ph Discussion
Sep 18 @ 1:30 pm – 2:00 pm
Astro-ph Discussion @ AY119
Sep
20
Fri
Astro-ph Discussion
Sep 20 @ 11:30 am – 12:00 pm
Astro-ph Discussion @ AY119
Sep
25
Wed
Astro-ph Discussion
Sep 25 @ 1:30 pm – 2:00 pm
Astro-ph Discussion @ AY119