Explorer of the Cosmos
Hi! I’m a postdoctoral research associate in the ND-CGM group at the University of Notre Dame. I am interested in understanding the baryonic matter surrounding galaxies, and use distant background quasars to probe this diffuse component around galaxies. I obtained my Ph.D. in Astronomy & Astrophysics from Penn State, where I worked with Prof. Jane Charlton on Ultraviolet/Optical spectroscopic studies of quasar absorption lines.
This video presents an absorption line study by Sameer et al. (2022) of the physical and chemical properties of the Leo HI Ring and the Leo I Group as traced by 11 quasar sightlines. Using HST/COS G130/G160 archival observations as constraints, we couple cloud-by-cloud, multiphase, Bayesian ionization modeling with galaxy property information to determine the plausible origin of the absorbing gas along these sightlines. We find that the metallicities associated with the Leo Ring are generally high, with values between solar and several times solar. The inferred high metallicities are consistent with an origin of the ring as tidal debris from a major galaxy.
This work was also highlighted at the Galactic Atmospheres forum
This video presents an absorption line study by Sameer et al. (2021). We present a new method aimed at improving the efficiency of component by component ionization modelling of intervening quasar absorption-line systems. We carry out cloud-by-cloud, multiphase modelling making use of CLOUDY and Bayesian methods to extract physical properties from an ensemble of absorption profiles. Here, as a demonstration of method, we focus on four weak, low-ionization absorbers at low redshift, because they are multiphase but relatively simple to constrain. This improved methodology will help to establish direct connections between the diverse properties derived from characterizing the absorbers and the multiple physical processes at play in the circumgalactic medium.
My CV is available here, and my full publication list is available here.
Invited Talk Feb 20, 2024
Astro Seminar University of Washington, WA
ND Astro Seminar Oct 31, 2023
Astrophysics Seminar University of Notre Dame, IN
Contributed Talk Feb 21, 2023
Structure of the Circumgalactic Medium Arizona State University, AZ
ND Astro Seminar Nov 22, 2022
Astrophysics Seminar University of Notre Dame, IN
Dissertation Talk June 16, 2022
AAS 240 Meeting Pasadena Convention Center, CA
Dissertation Defense June 10, 2022
Department Talk Penn State
Invited Talk January 27, 2022
Carnegie Tea Talk Carnegie Science Observatories
Contributed Talk November 5, 2021
STARs Lab Meeting Online, Arizona State University
Contributed Talk October 15, 2021
Milky Way Halo Research Group Meeting Online, STScI
Contributed Talk September 21, 2021
Lunch Talk Online, Penn State
Invited Talk August 19, 2021
Baltimore Winds Workshop Johns Hopkins University
Contributed Talk April 5, 2021
Galread Extragalactic Discussion Group Online, Princeton University
Contributed Talk March 25, 2021
High Energy Astro Group Seminar Online, MIT
Tutorial contributor & presenter Jan 20, 2021
Fundamentals of Gaseous Halos Workshop Online, UCSB
Invited Talk Oct 29, 2020
Data Science Consortium Online, University of Michigan
Department Colloquium June 19, 2020
Astronomy & Astrophysics Department Online, New Mexico State University
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|---|---|---|
| Item One | Ante turpis integer aliquet porttitor. | 29.99 |
| Item Two | Vis ac commodo adipiscing arcu aliquet. | 19.99 |
| Item Three | Morbi faucibus arcu accumsan lorem. | 29.99 |
| Item Four | Vitae integer tempus condimentum. | 19.99 |
| Item Five | Ante turpis integer aliquet porttitor. | 29.99 |
| 100.00 | ||
| Name | Description | Price |
|---|---|---|
| Item One | Ante turpis integer aliquet porttitor. | 29.99 |
| Item Two | Vis ac commodo adipiscing arcu aliquet. | 19.99 |
| Item Three | Morbi faucibus arcu accumsan lorem. | 29.99 |
| Item Four | Vitae integer tempus condimentum. | 19.99 |
| Item Five | Ante turpis integer aliquet porttitor. | 29.99 |
| 100.00 | ||