Dr. Nikole M. Nielsen

Research


Baryon Cycle

My research focuses on studying the baryon cycle, or the flow of gas into and out of galaxies. Cosmological simulations have shown it is vital for regulating galaxy evolution and building up the mass in galaxies. To do this, I examine the properties and motions of gas in the circumgalactic medium (CGM), a massive and diffuse reservoir of gas surrounding galaxies.

By comparing the CGM to the host galaxy properties (color, redshift, orientation, etc.), I determine whether the gas is likely accreting from the intergalactic medium or the CGM (recycled accretion), outflowing from star formation in the galaxy, or being tidally stripped from merging satellite galaxies. This constrains the role that the baryon cycle plays in galaxy evolution and to test predictions from the simulations.

My research generally aims to:
– Determine the spatial, geometric, and kinematic distribution of the CGM.
– Use gas kinematics, metallicities, and geometry to quantify gas flow rates.
– Determine how changes in galaxy star formation rate change gas flow rates and the CGM.
– Connect the ISM to the CGM for a comprehensive view of how galaxies obtain and process their gas.

I study the CGM via two methods:
Direct emission mapping takes an image of the CGM in various emission lines around a single galaxy. This has only recently become possible with new instruments like the Keck Cosmic Web Imager (KCWI) and MUSE. These images can spatially resolve the gas out to several tens of kiloparsecs from nearby galaxies and obtain information about the distribution and ionization conditions of the more dense gas in the CGM.
Quasar absorption lines use light from a background quasar to pierce the CGM of a foreground galaxy with instruments like HIRES on Keck or UVES on the VLT. The absorption signatures are sensitive to very diffuse gas and provide detailed gas properties such as the ionization balance, chemical content, density, temperature, and kinematics. Combining many galaxy–quasar pairs is required to statistically characterize the CGM. Up until recently, this was my primary method for studying the CGM.

CGM Emission

DUVET Outflows

Direct Emission Mapping:

I am a leading member of DUVET, whose aim is to test star formation theories, map multiphase outflows, and trace the transfer of gas between the interstellar medium (ISM) and the CGM with KCWI. We target low redshift galaxies that are analogs of z = 1–3 star-forming galaxies and link outflow properties to local star formation rates, star formation efficiencies, gas mass surface densities, and pressures. The outflows we measure in these galaxies will be key to understanding the outflows we measure in the CGM at Cosmic Noon.

So far we have measured outflows across the entire disk of the pilot DUVET galaxy, similar to the artist's illustration above left. We also traced the full baryon cycle in a single galaxy, Mrk 1486, using direct metallicity measurements, with metal-poor accretion along the major axis and metal-rich outflows along the minor axis. This was highlighted in the press release "Research reveals how star-making pollutes the cosmos". Most recently we used a new method to characterize the shape and flow rate of the large-scale outflow being driven from this galaxy out to nearly 10 kpc. These methods for tracing the gas flows around both face-on and edge-on starbursting galaxies are currently being applied to the rest of the DUVET sample.

IRAS08 CGM in emission

I am leading the more extended CGM "bonus science" for DUVET, where we have imaged the gas around our pilot DUVET target out to 30 kpc with sub-kiloparsec spatial resolution. We found emission everywhere we observed in three emission lines: [OII], Hβ, and [OIII]. Most excitingly, we revealed the transition between the gas in the disk and the gas in the CGM in both the surface brightness and ionization conditions. Future observations will determine if this transition is a common feature of galaxies or a special case for our first DUVET galaxy!



MAGIICAT

Quasar Absorption Lines:

I compiled the MgII Absorber–Galaxy Catalog, or MAGIICAT, which contains both MgII doublet absorption and galaxy data for 182 isolated absorber–galaxy pairs and 29 group environments. We have a series of papers which describe MAGIICAT and look at basic properties of the cool CGM.

I am building a new sample at Cosmic Noon (z = 2–3) to study gas flows when galaxies are most actively building their mass. We are using the integral field spectrograph KCWI to identify galaxies at this epoch and HIRES/UVES to analyze their CGM properties in as much detail as at lower redshifts. We have published 2 papers with this program so far, where in the first paper we modeled outflows along the minor axis of an isolated galaxy. AAS Nova highlighted this work in "Seeing Star Formation at Cosmic Noon". Our second paper highlighted a highly complex absorption system associated with a compact group of galaxies. The galaxies give rise to metal-rich high velocity outflows and tidal streams. We also found evidence for a significant amount of metal-poor accretion onto the galaxies from the intergalactic medium (IGM).

I am also a leading member of the Multiphase Galaxy Halos Survey, which studies low redshift (z < 1) absorber–galaxy pairs with OVI absorption. These data come from a Large program on the Hubble Space Telescope with the Cosmic Origins Spectrograph. Most recently, we examined how the CGM metallicity varies with location about galaxies. We expected to find pristine (low metallicity) gas accreting along galaxy disks and enriched (high metallicity) gas outflowing perpendicular to galaxies. Our work showed the picture is much more complicated.

Curriculum vitae


Education

New Mexico State University, Las Cruces, NM, USA
 Ph.D., Astronomy
  Dissertation: Tracing Galaxy Evolution Through Spatial and
  Kinematic Probes of the MgII Circumgalactic Medium

  Advisor: Christopher W. Churchill
May 2015
 M.S., Astronomy December 2013
Michigan State University, East Lansing, MI, USA
 B.S., Astrophysics
  Advisor: Timothy C. Beers
  Honors College
May 2009

Professional Development


Assistant Professor Starting August 2024
 Homer L. Dodge Department of Physics & Astronomy
 University of Oklahoma, Norman, OK, USA
ASTRO 3D Fellow (Level B) 2021–2024
Postdoctoral Research Associate 2015–2021
 Centre for Astrophysics and Supercomputing
 Swinburne University of Technology, Melbourne, VIC, Australia

Awards, Fellowships, and Grants


Swinburne/CAS Director's Outstanding Achievement Award 2022
Best Discovery by a Postdoc/Fellow at the ASTRO 3D Science Meeting 2022
Highly Commended for Swinburne Vice-Chancellor's Research
 Excellence Award (Early Career)
2019
Highly Commended for Swinburne Vice-Chancellor's Research
 Excellence Award (Early Career)
2017
NMSU Alumni Association Outstanding Graduate Award for
 the Graduate School, Ph.D.
2015
NMSU Astronomy Zia Award for Outstanding Research 2013
ASTRO 3D Fellowship 2021–2024
ASTRO 3D Covid-19 Extension Grant 2020–2021
NSF East Asia and Pacific Summer Institutes Fellowship at
 Swinburne University of Technology in Melbourne, Australia
2012
NMSU Graduate Research Enhancement Grant, Office of the
 Vice President for Research
2012–2015
New Mexico Space Grant Graduate Research Fellowship 2012
New Mexico Space Grant Graduate Research Fellowship 2010
IAU Travel Grant to IAUS321 2016
NMSU College of Arts and Sciences Graduate Travel Award 2014

Observing


220 HST orbits; 34.5 Keck, 2 Magellan, & 30+ APO 3.5m nights; 72.1 hrs VLT; 9.8 hrs ALMA
Awarded Time as PI: HST (WFC3), Keck (MOSFIRE, ESI, NIRC2-LGS), VLT (MUSE)
Awarded Time as Co-I: HST (COS, WFC3), Keck (KCWI, ESI, NIRC2-LGS, NIRES, LRIS),
 Magellan (MagE), VLT (MUSE, UVES), ALMA, APO 3.5m

Academic Service


Critical Design Review Panel for NASA Pioneers Astrophysics Project 2023
External Reviewer for HST's CGM and IGM Panel – – –
Grant proposal referee for FONDEYCT, Chile – –
Scientific referee for ApJ, ApJ Letters, A&A, MNRAS 2014–Present
Swinburne/CAS Time Allocation Committee for AAT 2022–2024
Swinburne/CAS Vacation Studentship Organizer 2021–2024
Swinburne/CAS Equity & Diversity Committee 2019–2024
Swinburne Time Allocation Committee for Keck, 3 semesters 2018–2019
Swinburne/CAS Weekly Scientific Colloquium Series Organizer 2016–2018
 – Aimed toward a gender-balanced schedule
 – 40% of 2017 speakers were women, up from avg 25% for 2012-2016
Science Organizing Committees
 ASTRO 3D 2020 Science Meeting 2020
 3rd Swinburne–Caltech Workshop: Galaxies and their Halos 2017
 Astronomical Society of Australia 2017 Annual Scientific Meeting 2017
NMSU Astronomy Department Graduate Awards Committee
 Graduate Student Representative
2014–2015
NMSU Astronomy Graduate Student Organization 2009–2015
 President, Faculty–Student Liaison 2011–2012
 Vice President, Department Outreach Coordinator 2010–2011

Professional Memberships


Member of ARC Centre of Excellence ASTRO 3D 2019–Present
Astronomical Society of Australia 2018–Present
American Astronomical Society 2012–2015
Sigma Pi Sigma Physics Honor Society 2009
Society of Physics Students 2005–2009
 President 2008–2009
 Secretary 2007–2008

Publications — ADS Compilation


Refereed Publications


48. DUVET: sub-kiloparsec resolved star formation driven outflows in a sample of local starbursting disk galaxies
Reichardt Chu, B., Fisher, D. B., Chisholm, J., Berg, D., Bolatto, A., Cameron, A. J., Fielding, D. B., Herrera-Camus, R., Kacprzak, G. G., Li, M., McLeod, A. F., McPherson, D. K., Nielsen, N. M., Rickards Vaught, R. J., Ridolfo, S. G., & Sandstrom, K. M. 2024, MNRAS, submitted
47. The Evolution of MgII Absorbers from z=7 to z=0
Churchill, C. W., Abbas, A., Kacprzak, G. G., & Nielsen, N. M. 2024, ApJ, submitted
46. Signatures of Gas Flows - II: Connecting the kinematics of the multiphase circumgalactic medium to galaxy rotation
Nateghi, H., Kacprzak, G. G., Nielsen, N. M., Sameer, Murphy, M. T., Churchill, C. W., & Charlton, J. C. 2024, MNRAS, submitted
45. Signatures of gas flows - I: Connecting the kinematics of HI circumgalactic medium to galaxy rotation
Nateghi, H., Kacprzak, G. G., Nielsen, N. M., Murphy, M. T., Churchill, C. W., Muzahid, S., Sameer, & Charlton, J. C. 2024, MNRAS, submitted
44. The Cool Circumgalactic Medium around a Quiescent Galaxy from Gravitational Lensing
Barone, T. M., Kacprzak, G. G., Nightingale, J. W., Nielsen, N. M., Glazebrook, K., Tran, K.-V. H., Jones, T., Nateghi, H., Vasan G. C., K., Sahu, N., Nanayakkara, T., Skobe, H., van de Sande, J., Lopez, S., & Lewis, G. F. 2024, Nature Communications, submitted
43. Revealing the disk–circumgalactic medium transition with emission mapping
Nielsen, N. M., Fisher, D. B., Kacprzak, G. G., Chisholm, J., Martin, D. C., Reichardt Chu, B., Sandstrom, K. M., & Rickards Vaught, R. J. 2024, Nature Astronomy, submitted
42. Unveiling the Complex Circumgalactic Medium: A Comparative Study of Merging and Non-Interacting Galaxy Groups
Fernández-Figueroa, A., Kacprzak, G. G., Nielsen, N. M., Barone, T. M., Nateghi, H., Sameer, Fisher, D. B., & Reichardt Chu, B. 2024, MNRAS, accepted
41. DUVET: Resolved direct metallicity measurements in the outflow of starburst galaxy NGC 1569
Hamel-Bravo, M. J., Fisher, D. B., Berg, D., Björgvinsson, B., Bolatto, A., Cameron, A. J., Chisholm, J., Fielding, D. B., Herrera-Camus, R., Kacprzak, G. G., Li, M., Mazzilli Ciraulo, B., McLeod, A. F., McPherson, D. K., Nielsen, N. M., Reichardt Chu, B., Rickards Vaught, R. J., & Sandstrom, K. M. 2024, MNRAS, 530, 3855
40. Cloud-by-cloud Multiphase Investigation of the Circumgalactic Medium of Low-redshift Galaxies
Sameer, Charlton, J. C., Wakker, B. P., Kacprzak, G. G., Nielsen, N. M., Churchill, C. W., Richter, P., Muzahid, S., Ho, S. H., Nateghi, H., Rosenwasser, B., Narayanan, A., & Ganguly, R. 2024, MNRAS, 530, 3827
39. Examining quasar absorption-line analysis methods: the tension between simulations and observational assumptions key to modelling clouds
Marra, R., Churchill, C. W., Kacprzak, G. G., Nielsen, N. M., Trujillo-Gomez, S., & Lewis, E. 2024, MNRAS, 527, 10522
38. DUVET Survey: Mapping Outflows in the Metal-Poor Starburst Mrk 1486
McPherson, D. K., Fisher, D. B., Nielsen, N. M., Kacprzak, G. G., Reichardt Chu, B., Cameron, A. J., Bolatto, A. D., Chisholm, J., Fielding, D. B., Berg, D., Herrera-Camus, R., Li, M., Rickards Vaught, R. J., & Sandstrom, K. 2023, MNRAS, 525, 6170
37. DUVET: Spatially Resolved Observations of Star Formation Regulation via Galactic Outflows in a Starbursting Disk Galaxy
Reichardt Chu, B., Fisher, D. B., Bolatto, A. D., Chisholm, J., Fielding, D., Berg, D., Cameron, A. J., Glazebrook, K., Herrera-Camus, R., Kacprzak, G. G., Lenkić, L., Li, M., McPherson, D. K., Nielsen, N. M., Obreschkow, D., Rickards Vaught, R. J., & Sandstrom, K. 2022, ApJ, 941, 163
36. A Complex Multiphase DLA Associated with a Compact Group at z=2.431 Traces Accretion, Outflows, and Tidal Streams
Nielsen, N. M., Kacprzak, G. G., Sameer, Murphy, M. T., Nateghi, H., Charlton, J. C., & Churchill, C. W. 2022, MNRAS, 514, 6074
35. The DUVET Survey: Resolved Maps of Star Formation Outflows in a Compact, Starbursting Galaxy
Reichardt Chu, B., Fisher, D. B., Nielsen, N. M., Chisholm, J., Girard, M., Kacprzak, G. G., Bolatto, A., Herrera-Camus, R., Sandstrom, K., Li, M., Rickards Vaught, R., & McPherson, D. K. 2022, MNRAS, 511, 5782
34. Extreme Variation in Star Formation Efficiency across a Compact, Starbursting Disk Galaxy
Fisher, D. B., Bolatto, A. D., Glazebrook, K., Obreschkow, D., Abraham, R. G., Kacprzak, G. G., & Nielsen, N. M. 2022, ApJ, 928, 169
33. Probing the physicochemical properties of the Leo Ring and the Leo I group
Sameer, Charlton, J. C., Kacprzak, G. G., Narayanan, A., Sankar, S., Richter, P., Wakker, B. P., Nielsen, N. M., & Churchill, C. W. 2022, MNRAS, 510, 5796
32. Evolution of CIV Absorbers. II. Where does CIV live?
Hasan, F., Churchill, C. W., Stemock, B., Nielsen, N. M., Kacprzak, G. G., Croom, M., & Murphy, M. T. 2022, ApJ, 924, 12
31. Using cosmological simulations and synthetic absorption spectra to assess the accuracy of observationally derived CGM metallicities
Marra, R., Churchill, C. W., Doughty, C., Kacprzak, G. G., Charlton, J. C., Sameer, Nielsen, N. M., Ceverino, D., & Trujillo-Gomez, S. 2021, MNRAS, 508, 4938
30. The DUVET Survey: Direct Te-based Metallicity Mapping of Metal-enriched Outflows and Metal-poor Inflows in Markarian 1486
Cameron, A. J., Fisher, D. B., McPherson, D., Kacprzak, G. G., Berg, D. A., Bolatto, A., Chisholm, J., Herrera-Camus, R., Nielsen, N. M., Reichardt Chu, B., Rickards Vaught, R. J., Sandstrom, K, & Trenti, M. 2021, ApJL, 918, L16
29. Spatial Distribution of OVI Covering Fractions in the Simulated Circumgalactic Medium
Marra, R., Churchill, C. W., Kacprzak, G. G., Vander Vliet, R. P., Ceverino, D., Lewis, E., Nielsen, N. M., Muzahid, S., & Charlton, J. C. 2021, ApJ, 907, 8
28. Cloud-by-cloud, multiphase, Bayesian modeling: Application to four weak, low ionization absorbers
Sameer, Charlton, J. C., Norris, J. M., Gebhardt, M., Churchill, C. W., Kacprzak, G. G., Muzahid, S., Narayanan, A., Nielsen, N. M., Richter, P., & Wakker, B. 2021, MNRAS, 501, 2112
27. Disentangling the multi-phase circumgalactic medium shared between a dwarf and a massive star-forming galaxy at z~0.4
Nateghi, H., Kacprzak, G. G., Nielsen, N. M., Muzahid, S., Churchill, C. W., Pointon, S. K., & Charlton, J. C. 2021, MNRAS, 500, 3987
26. Evidence for galaxy quenching in the green valley caused by a lack of a circumgalactic medium
Kacprzak, G. G., Nielsen, N. M., Nateghi, H., Churchill, C. W., Pointon, S. K., Nanayakkara, T., Muzahid, S., & Charlton, J. C. 2021, MNRAS, 500, 2289
25. The CGM at Cosmic Noon with KCWI: Outflows from a Star-forming Galaxy at z=2.071
Nielsen, N. M., Kacprzak, G. G., Pointon, S. K., Murphy, M. T., Churchill, C. W., & Davé, R. 2020, ApJ, 904, 164
24. Evolution of CIV Absorbers. I. The Cosmic Incidence
Hasan, F., Churchill, C. W., Stemock, B., Mathes, N. L., Nielsen, N. M., Finlator, K., Doughty, C., Croom, M., Kacprzak, G. G., & Murphy, M. T. 2020, ApJ, 904, 44
23. MgII Absorbers in High-Resolution Quasar Spectra. I. Voigt Profile Models
Churchill, C. W., Evans, J. L., Stemock, B., Nielsen, N. M., Kacprzak, G. G., & Murphy, M. T. 2020, ApJ, 904, 28
22. Low-mass Group Environments Have No Substantial Impact on the Circumgalactic Medium Metallicity
Pointon, S. K., Kacprzak, G. G., Nielsen, N. M., Murphy, M. T., Muzahid, S., Churchill, C. W., & Charlton, J. C. 2020, AJ, 159, 216
21. The Relationship between Galaxy ISM and Circumgalactic Gas Metallicities
Kacprzak, G. G., Pointon, S. K., Nielsen, N. M., Churchill, C. W., Muzahid, S., & Charlton, J. C. 2019, ApJ, 886, 91
20. Kinematics of the OVI Circumgalactic Medium: Halo Mass Dependence and Outflow Signatures
Ng, M., Nielsen, N. M., Kacprzak, G. G., Pointon, S. K., Muzahid, S., Churchill, C. W., & Charlton, J. C. 2019, ApJ, 886, 66
19. Relationship between the Metallicity of the Circumgalactic Medium and Galaxy Orientation
Pointon, S. K., Kacprzak, G. G., Nielsen, N. M., Muzahid, S., Murphy, M. T., Churchill, C. W., & Charlton, J. C. 2019, ApJ, 883, 78
18. Io's Volcanic Activity from Time Domain Adaptive Optics Observations: 2013-2018
de Kleer, K., de Pater, I., Molter, E. M., Banks, E., Davies, A. G., Alvarez, C., Campbell, R., Aycock, J., Pelletier, J., Stickel, T., Kacprzak, G. G., Nielsen, N. M., Stern, D., & Tollefson, J. 2019, AJ, 158, 29
17. The Relation between Galaxy ISM and Circumgalactic OVI Gas Kinematics Derived from Observations and ΛCDM Simulations
Kacprzak, G. G., Vander Vliet, R. P., Nielsen, N. M., Muzahid, S., Pointon, S. K., Churchill, C. W., Ceverino, D., Arraki, K. S., Klypin, A., Charlton, J. C., & Lewis, E. 2019, ApJ, 870, 137
16. MAGIICAT VI. The MgII Intragroup Medium is Kinematically Complex
Nielsen, N. M., Kacprzak, G. G., Pointon, S. K., Churchill, C. W., & Murphy, M. T. 2018, ApJ, 869, 153
15. The Impact of the Group Environment on the OVI Circumgalactic Medium
Pointon, S. K., Nielsen, N. M., Kacprzak, G. G., Muzahid, S., Churchill, C. W., & Charlton, J. C. 2017, ApJ, 844, 23
14. The Highly Ionized Circumgalactic Medium is Kinematically Uniform Around Galaxies
Nielsen, N. M., Kacprzak, G. G., Muzahid, S., Churchill, C. W., Murphy, M. T., & Charlton, J. C. 2017, ApJ, 834, 148
13. MAGIICAT IV. Kinematics of the Circumgalactic Medium and Evidence for Quiescent Evolution Around Red Galaxies
Nielsen, N. M., Churchill, C. W., Kacprzak, G. G., Murphy, M. T., & Evans, J. L. 2016, ApJ, 818, 171
12. The Azimuthal Dependence of Outflows and Accretion Detected Using OVI Absorption
Kacprzak, G. G., Muzahid, S., Churchill, C. W., Nielsen, N. M., & Charlton, J. C. 2015, ApJ, 815, 22
11. MAGIICAT V. Orientation of Outflows and Accretion Determine the Kinematics and Column Densities of the Circumgalactic Medium
Nielsen, N. M., Churchill, C. W., Kacprzak, G. G., Murphy, M. T., & Evans, J. L. 2015, ApJ, 812, 83
10. An Extreme Metallicity, Large-Scale Outflow from a Star-Forming Galaxy at z~0.4
Muzahid, S., Kacprzak, G. G., Churchill, C. W., Charlton, J. C., Nielsen, N. M., Mathes, N. L., & Trujillo-Gomez, S. 2015, ApJ, 811, 132
9. Halo Mass Dependence of HI and OVI Absorption: Evidence for Differential Kinematics
Mathes, N. L., Churchill, C. W., Kacprzak, G. G., Nielsen, N. M., Trujillo-Gomez, S., Charlton, J., & Muzahid, S. 2014, ApJ, 792, 128
8. MAGIICAT III. Interpreting Self-Similarity of the Circumgalactic Medium with Virial Mass Using MgII Absorption
Churchill, C. W., Trujillo-Gomez, S., Nielsen, N. M., & Kacprzak, G. G. 2013, ApJ, 779, 87
7. The Smooth MgII Gas Distribution Through the Interstellar/Extra-planar/Halo Interface
Kacprzak, G. G., Cooke, J., Churchill, C. W., Ryan-Weber, E. V., & Nielsen, N. M. 2013, ApJ, 777, L11
6. MAGIICAT I. The MgII Absorber-Galaxy Catalog
Nielsen, N. M., Churchill, C. W., Kacprzak, G. G., & Murphy, M. T. 2013, ApJ, 776, 114
5. MAGIICAT II. General Characteristics of the MgII Absorbing Circumgalactic Medium
Nielsen, N. M., Churchill, C. W., & Kacprzak, G. G. 2013, ApJ, 776, 115
4. The Redshift Distribution of Intervening Weak MgII Quasar Absorbers and a Curious Dependence on Quasar Luminosity
Evans, J. L., Churchill, C. W., Murphy, M. T., Nielsen, N. M., & Klimek, E. S. 2013, ApJ, 768, 3
3. The Self-Similarity of the Circumgalactic Medium with Galaxy Virial Mass: Implications for Cold-Mode Accretion
Churchill, C. W., Nielsen, N. M., Kacprzak, G. G., & Trujillo-Gomez, S. 2013, ApJ, 763, L42
2. Tracing Outflows and Accretion: A Bimodal Azimuthal Dependence of MgII Absorption
Kacprzak, G. G., Churchill, C. W., & Nielsen, N. M. 2012, ApJ, 760, L7
1. Quenched Accretion of a Large Scale Metal-Poor Filament due to Virial Shocking in the Halo of a Massive z=0.7 Galaxy
Churchill, C. W., Kacprzak, G. G., Steidel, C. C., Spitler, L. R., Holtzman, J. A., Nielsen, N. M., & Trujillo-Gomez, S. 2012, ApJ, 760, 68

Conference Proceedings


3. Gas Kinematics in the Multiphase Circumgalactic Medium
Nielsen, N. M., Kacprzak, G. G., Churchill, C. W., Murphy, M. T., Muzahid, S., Charlton, J. C., & Evans, J. L. 2017, in IAU Symposium 321, Formation and Evolution of Galaxy Outskirts, ed. A. Gil de Paz, J. H. Knapen, & J. C. Lee, 345
2. HST Observations Reveal the Curious Geometry of Circumgalactic Gas
Kacprzak, G. G., Muzahid, S., Churchill, C. W., Nielsen, N. M., & Charlton, J. C. 2017, in IAU Symposium 321, Formation and Evolution of Galaxy Outskirts, ed. A. Gil de Paz, J. H. Knapen, & J. C. Lee, 342
1. HST Observations Reveal the Curious Geometry of Circumgalactic Gas
Kacprzak, G. G., Muzahid, S., Churchill, C. W., Nielsen, N. M., & Charlton, J. C. 2016, in The Interplay between Local and Global Processes in Galaxies, ed. S. F. Sanchez, C. Morisset, & G. Delgado-Inglada, 26

Conferences and Colloquia


Conferences


– CGM-Chile 2024: Resolving the Circumgalactic Medium and its
 Impact on Galaxy Evolution
Nov 2024 Invited Talk
– 2024 Wolfe Symposium in Astrophysics Mar 2024 Invited Talk
– CGM@ND Workshop in Kylemore, Ireland Sep 2023 Invited Talk
– New Views on Feedback & the Baryon Cycle in Galaxies in
 Healesville, Australia
Jul 2023 Talk
– ASTRO 3D 2023 Science Meeting in Perth, Australia (video) May 2023 Talk
– Oases in the Cosmic Desert: Understanding the Structure of the
 CGM in Tempe, Arizona, USA
Feb 2023 Talk
– What matter(s) around galaxies 2022 in The Alps, Italy Sep 2022 Invited Talk
– Astronomical Society of Australia Annual Scientific Meeting in
 Hobart, Australia
Jun 2022 Talk
– ASTRO 3D 2022 Science Meeting in Melbourne, Australia Jun 2022 Talk
– Keck Science Meeting (zoom - video) Sep 2021 Talk
– ASTRO 3D 2021 Science Meeting (zoom) Sep 2021 Sprint Talk
– KITP Program Fundamentals of Gaseous Halos (zoom) Jan 2021 Talk
Spatially Resolved CGM Emission in a Nearby Starbursting
  Galaxy with DUVET
Outflows from a Star-forming Galaxy at z=2.071 with KCWI
– CGM@ND Workshop in Dublin and Kylemore, Ireland Postponed Invited Talk
– Multiphase Gas in Galaxy Groups Workshop in Charlottesville,
 Virginia, USA
Cancelled Invited Talk
– CGM Berlin 2019 in Berlin, Germany Oct 2019 Invited Talk
– 2nd KIAA Forum on Gas in Galaxies in Beijing, China Sep 2019 Invited Talk
– Astronomical Society of Australia Annual Scientific Meeting in
 Brisbane, Australia
Jul 2019 Talk
– Australia–ESO Joint Conference: Linking Galaxies from the
 Epoch of Initial Star Formation to Today in Sydney, Australia
Feb 2019 Talk
– Intergalactic Interconnections in Marseille, France Jul 2018 Talk
– Astronomical Society of Australia Annual Scientific Meeting in
 Melbourne, Australia
Jun 2018 Poster
– Keck Science Meeting 2017 in Santa Cruz, CA Sep 2017 Talk
– The 3rd Swinburne-Caltech Workshop: Galaxies and their Halos
 in Pasadena, CA
Sep 2017 Talk
– The Circle of Life: Connecting the Intergalactic, Circumgalactic,
 and Interstellar Media in Kruger Park, South Africa
Aug 2017 Talk
– What Matter(s) Around Galaxies in Durham, UK Jun 2017 Talk
– ITSO Science Symposium 2017 in Canberra, Australia May 2017 Talk
– Crossing the Rubicon in Santarcangelo di Romagna, Italy Sep 2016 Talk
– IAUS 321 Formation and Evolution of Galaxy Outskirts in
 Toledo, Spain
Mar 2016 Talk
– 225th American Astronomical Society Meeting in Seattle, WA Jan 2015 Talk
– Santa Cruz Galaxy Workshop in Santa Cruz, CA Aug 2014 Talk
– Intergalactic Matters in Heidelberg, Germany Jun 2014 Talk
– The Near-Field Deep-Field Connection in Irvine, CA Feb 2014 Poster
– The Physical Link Between Galaxies and their Halos in Garching,
 Germany
Jun 2013 Poster
– Leiden Summer CGM–Galaxy Interface Workshop in Leiden,
 Netherlands
Jun 2013 Talk
– The 28th New Mexico Symposium in Socorro, NM Nov 2012 Talk
– STScI May Symposium: Gas Flows in Galaxies in Baltimore, MD May 2012 Poster
– 219th American Astronomical Society Meeting in Austin, TX Jan 2012 Poster

Colloquia & Seminars


University of Missouri Physics & Astronomy Colloquium Apr 2024 Invited Talk
University of South Carolina Physics & Astronomy Colloquium Mar 2024 Invited Talk
University of Oklahoma Physics & Astronomy Colloquium Mar 2024 Invited Talk
University of Iowa Physics & Astronomy Colloquium Feb 2024 Invited Talk
NASA Diffuse Gas in Cosmic Ecosystems SIG Seminar (video) Jan 2024 Invited Talk
UNSW AstroSeminar May 2023 Invited Talk
ASTRO 3D Zoom Colloquium Series Dec 2022 Invited Talk
Sydney Institute for Astronomy Seminar, University of Sydney Aug 2022 Invited Talk
Swinburne University of Technology Colloquium Jul 2022 Invited Talk
ICRAR/UWA Seminar Apr 2022 Invited Talk
University of Melbourne Astrophysics Seminar Apr 2021 Invited Talk
OUTAP Colloquium at Osaka University Nov 2020 Invited Talk
Cosmology-Galaxy-IGM Seminar at UC Santa Cruz Oct 2020 Invited Talk
NMSU Astronomy Department Colloquium Sep 2020 Invited Talk
Sydney Institute for Astronomy Seminar, University of Sydney Cancelled Invited Talk
ICRAR/UWA Seminar in Perth, Australia Cancelled Invited Talk
ASTRO 3D Zoom Colloquium Series Oct 2019 Invited Talk
Swinburne Research Conference ECR Panel May 2018 Invited Panel
Swinburne Director's Lunch Talk Feb 2018 Invited Talk
Swinburne ASTRO 3D Lunch Talk Jun 2017 Invited Talk
University of Melbourne Astrophysics Seminar May 2017 Invited Talk