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Clumpy vs. Extended Lyman Alpha Emitters at High Redshift

Navarre, Alexander
http://orcid.org/0000-0001-7548-0473
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1712911236877456

Abstract Details

2024, PhD, University of Cincinnati, Arts and Sciences: Physics.
I present six strongly gravitationally lensed Lyα Emitters (LAEs) at z ~ 4-5 with HST narrowband imaging isolating Lyα. Through complex radiative transfer, Lyα encodes information about the spatial distribution and kinematics of the neutral hydrogen upon which it scatters. This information can help explain how star-forming galaxies contributed to Reionization. The primary goal of this work is to investigate the galaxy properties and Lyα morphologies of this sample. Many previous studies of high-redshift LAEs have been limited in Lyα spatial resolution. In this work I take advantage of high-resolution Lyα imaging boosted by lensing magnification, allowing for probing of sub-galactic scales that are otherwise inaccessible at these redshifts. I use broadband imaging from HST (rest-frame UV) and Spitzer (rest-frame optical) in SED fitting; providing estimates on the stellar masses ( ~ 108 - 109 M⊙), stellar population ages (t50 < 40 Myr), and amounts of dust (A V ~ 0.1 - 0.6, statistically consistent with zero). I employ non-parametric star-formation histories to probe the young stellar-populations which create Lyα. I also examine the offsets between the Lyα and stellar continuum, finding small upper limits of offsets (<0.1") consistent with studies of low-redshift LAEs, indicating our galaxies are not interacting or merging. I find a bimodality in the sample's Lyα morphologies: clumpy and extended. Comparing these morphologies to the inferred galaxy properties, I find a suggestive trend: our LAEs with clumpy Lyα are generally younger than the LAEs with extended Lyα, suggesting a possible correlation with age. Finally, I present preliminary results from new, state of the art forward modeling code for one object in the sample. I find that intrinsic clump sizes between Lyα and the stellar continuum are statistically equivalent, possibly indicating the presence of ionized channels in the ISM.
Matthew Bayliss, Ph.D. (Committee Chair)
Hans-Peter Wagner, Ph.D. (Committee Member)
L. C. R. Wijewardhana, Ph.D. (Committee Member)
Colin Bischoff, Ph.D. (Committee Member)
69 p.
Astrophysics
Lyman Alpha; Reionization; Gravitational Lensing; SED; High Redshift; Morphology

Recommended Citations

Citations

  • Navarre, A. (2024). Clumpy vs. Extended Lyman Alpha Emitters at High Redshift [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1712911236877456

    APA Style (7th edition)

  • Navarre, Alexander. Clumpy vs. Extended Lyman Alpha Emitters at High Redshift. 2024. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1712911236877456.

    MLA Style (8th edition)

  • Navarre, Alexander. "Clumpy vs. Extended Lyman Alpha Emitters at High Redshift." Doctoral dissertation, University of Cincinnati, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1712911236877456

    Chicago Manual of Style (17th edition)

ucin1712911236877456
41
© 2024, some rights reserved.Creative Commons License Clumpy vs. Extended Lyman Alpha Emitters at High Redshift by Alexander Navarre is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.