Modelling Local Galaxy HI Disks With WALLABY Pilot Phase 2
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Authors
Halloran, Rebecca
Date
Type
thesis
Language
eng
Keyword
HI , WALLABY , Size-mass relation , Size-velocity relation , Kinematic models
Alternative Title
Abstract
Neutral atomic hydrogen, HI, is a readily available observable tracer of atomic gas in the universe. The model reliability for HI detections in recovering the rotation curve from kinematic models has been previously studied, but this has not been done for the surface density profiles. This thesis investigates the reliable recovery of the surface density profiles and HI radius, R$_{HI}$ from the Pilot Phase 2 of the Widefield ASKAP L-band Legacy All-sky surveY (WALLABY) detections from the Australian SKA Pathfinder (ASKAP) telescope. The surface density profiles and R$_{HI}$ were measured using a nested tilted ring modelling method on mock WALLABY observations to determine the regime in which these characteristics are reliably recovered. The kinematic modeling previously completed for the WALLABY Public Data Release 1 (PDR1) was then completed for WALLABY Pilot Phase 2 data (Phase 2). The results from the kinematic modeling were compared to quantify the modeling results (attempted models, successful models, failed models). The results from the kinematic models for the Phase 2 data are used to construct scaling relations: HI size-mass, and the HI size-velocity. The derived HI size-mass relation follows a tight correlation as expected from previous investigations. The HI size-velocity relation constructed is among the first ever for an untargetted HI survey, and demonstrates the potential of WALLABY to constrain the structure of populations of HI disks.
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Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada
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Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owne
Proquest PhD and Master's Theses International Dissemination Agreement
Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owne