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Breaking Diagnostic Degeneracies in the Era of Spatially Resolved Galaxies

Johnston, Victor David
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1702487048459299

Abstract Details

, Doctor of Philosophy, University of Toledo, Physics.
Current methods of identifying the ionizing source of nebular emission in galaxies are well defined for the era of single-fiber spectroscopy, but still struggle to differenti- ate the complex and overlapping ionization sources in some galaxies. With the advent of integral field spectroscopy, the limits of these previous classification schemes are more apparent. We propose a new method for distinguishing the ionizing source in resolved galaxy spectra by use of a multidimensional diagnostic diagram that com- pares emission-line ratios with velocity dispersion on a spaxel-by-spaxel basis within a galaxy. This new method is tested using the Sydney-Australian-Astronomical- Observatory Multi-object Integral-Field Spectrograph Galaxy Survey (SAMI) Data Release 3 (DR3), which contains 3068 galaxies at z < 0.12. Using the results of our new classification method, we also investigate the prevalence of outflows and their spatial correlation to both shock and AGN excitation. We find that globally, out- flows are most associated with non-star-forming ionization and are strongest in cases of AGN dominated ionization, while the trend is less noticeable for individual galax- ies. Finally, we investigate a population of 251 low-mass spiral galaxies with high emission line ratios and no other signatures of either shock or AGN excitation. These galaxies have kinematics and WISE colors that suggest they are dominated by simple star formation.
Anne Medling (Committee Chair)
Jillian Bornak (Committee Member)
Eli Visbal (Committee Member)
J.D. Smith (Committee Member)
Brent Groves (Committee Member)
110 p.
Astronomy; Astrophysics; Physics

Recommended Citations

Citations

  • Johnston, V. D. (2023). Breaking Diagnostic Degeneracies in the Era of Spatially Resolved Galaxies [Doctoral dissertation, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1702487048459299

    APA Style (7th edition)

  • Johnston, Victor. Breaking Diagnostic Degeneracies in the Era of Spatially Resolved Galaxies. 2023. University of Toledo, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1702487048459299.

    MLA Style (8th edition)

  • Johnston, Victor. "Breaking Diagnostic Degeneracies in the Era of Spatially Resolved Galaxies." Doctoral dissertation, University of Toledo, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1702487048459299

    Chicago Manual of Style (17th edition)

toledo1702487048459299
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© 2023, some rights reserved.Creative Commons License Breaking Diagnostic Degeneracies in the Era of Spatially Resolved Galaxies by Victor David Johnston is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Toledo and OhioLINK.