HI Vertical Structure of Nearby Edge-on Galaxies from CHANG-ES
Yun Zheng, Jing Wang, Judith Irwin, Q. Daniel Wang, Jiangtao Li,, Jayanne English, Qingchuan Ma, Ran Wang, Ke Wang, Marita Krause, Toky H., Randriamampandry, Rainer Beck
TL;DR
This paper investigates the vertical structure of HI gas disks in edge-on galaxies from the CHANG-ES survey, developing a photometric method to accurately measure disk scale-heights and validate it against theoretical models.
Contribution
It introduces a new photometric approach to derive HI disk scale-heights in edge-on galaxies, accounting for systematic broadening effects.
Findings
Corrected HI scale-heights align with quasi-equilibrium models.
Method is effective for statistical analysis of galaxy samples.
Provides a practical tool for future large-scale studies.
Abstract
We study the vertical distribution of the highly inclined galaxies from the Continuum Halos in Nearby Galaxies - an EVLA Survey (CHANG-ES). We explore the feasibility of photometrically deriving the HI disk scale-heights from the moment-0 images of the relatively edge-on galaxies with inclination >80 deg, by quantifying the systematic broadening effects and thus deriving correction equations for direct measurements. The corrected HI disk scale-heights of the relatively edge-on galaxies from the CHANG-ES sample show trends consistent with the quasi-equilibrium model of the vertical structure of gas disks. The procedure provide a convenient way to derive the scale-heights and can easily be applied to statistical samples in the future.
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