Calendar

May
5
Fri
Colloquium PhD Defense: Jacob Vander Vliet
May 5 @ 3:15 pm – 4:15 pm
Colloquium PhD Defense: Jacob Vander Vliet @ Domenici Hall 106

Observing the Baryon Cycle in Hydrodynamic Cosmological Simulations

Jacob Vander Vliet, NMSU

An understanding of galaxy evolution requires an understanding of the flow of baryons in and out of a galaxy. The accretion of baryons is required for galaxies to form stars, while stars eject baryons out of the galaxy through stellar feedback mechanisms such as supernovae, stellar winds, and radiation pressure. The interplay between outflowing and infalling material form the circumgalactic medium (CGM). Hydrodynamic simulations provide understanding in the connection between stellar feedback and the distribution and kinematics of baryons in the CGM. To compare simulations and observations properly the simulated CGM must be observed in the same manner as the real CGM. I have developed the Mockspec code to generate synthetic quasar absorption line observations of the CGM in cosmological hydrodynamic simulations. Mockspec generates synthetic spectra based on the phase, metallicity, and kinematics of CGM gas and mimics instrumental effects. Mockspec includes automatic analysis of the spectra and identifies the gas responsible for the absorption. Mockspec was applied to simulations of dwarf galaxies at low redshift to examine the observable effect different feedback models have on the CGM. While the different feedback models had strong effects on the galaxy, they all produced a similar CGM that failed match observations. Mockspec was applied to the VELA simulation suite of high redshift, high mass galaxies to examine the variance of the CGM across different galaxies in different environments. The observable CGM showed little variation between the different galaxies and almost no evolution from z=4 to z=1. The VELAs were not able to generate a CGM to match the observations. The properties of cells responsible for the absorption were compared to the derived properties from Voigt Profile decomposition. VP modeling was found to accurately describe the HI and MgII absorbing gas but failed for high ionization species such as CIV and OVI, which do not arise in the assumed coherent structures.  The technique of mock QAL is useful for testing the accuracy of the simulated CGM and for verifying observational techniques, but not for differentiating between feedback prescriptions in dwarf galaxies.

 

Tombaugh Observatory Open House
May 5 @ 9:00 pm – 10:00 pm
Tombaugh Observatory Open House

Open to the public.

Faculty member: Jon Holtzman

Graduate students: Laurel Farris, Drew Chojnowski

 

http://whatsouttonight.com/Resources/2016SepSkyWOT.pdf

May
10
Wed
Astro-ph Discussion
May 10 @ 2:30 pm – 3:00 pm
May
11
Thu
PDS Atmospheres Node meeting
May 11 @ 9:00 am – 10:00 am
Galaxy Group
May 11 @ 12:00 pm – 12:30 pm
May
15
Mon
Pizza Lunch: Jodi Berdis
May 15 @ 12:30 pm – 1:30 pm
Pizza Lunch: Jodi Berdis @ AY 119

598 Talk

Aug
18
Fri
Colloquium: OPEN (Host: TBD)
Aug 18 @ 3:15 pm – 4:15 pm
Colloquium: OPEN (Host: TBD) @ BX102

Colloquium Title

Colloquium Speaker Name, Affiliation

Abstract text

Laurel – Thesis proposal
Aug 18 @ 3:15 pm – 4:15 pm
Aug
25
Fri
Colloquium: OPEN (Host: TBD)
Aug 25 @ 3:15 pm – 4:15 pm
Colloquium: OPEN (Host: TBD) @ BX102

Colloquium Title

Colloquium Speaker Name, Affiliation

Abstract text

Sep
1
Fri
Colloquium: OPEN (Host: TBD)
Sep 1 @ 3:15 pm – 4:15 pm
Colloquium: OPEN (Host: TBD) @ BX102

Colloquium Title

Colloquium Speaker Name, Affiliation

Abstract text