Using EAGLE simulations to study the effect of observational constraints on the determination of HI asymmetries in galaxies

Using EAGLE simulations to study the effect of observational constraints on the determination of HI asymmetries in galaxies

We investigate the effect of observational constraints such as signal-to-noise, resolution and column density level on the HI morphological asymmetry (\(\mathrm{A}_\mathrm{mod}\)) and the effect of noise on the HI global profile (\(\mathrm{A}_\mathrm{flux}\)) asymmetry indices. Using mock galaxies f...

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Veröffentlicht in:arXiv.org 2022-05
Hauptverfasser: Bilimogga, P V, Oman, K A, Verheijen, M A W, J M van der Hulst
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Asymmetry
Density
Galaxies
Morphology
Noise
Physics - Astrophysics of Galaxies
Robustness
Signal to noise ratio
Stars & galaxies
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Oman, K A
Verheijen, M A W
J M van der Hulst
description We investigate the effect of observational constraints such as signal-to-noise, resolution and column density level on the HI morphological asymmetry (\(\mathrm{A}_\mathrm{mod}\)) and the effect of noise on the HI global profile (\(\mathrm{A}_\mathrm{flux}\)) asymmetry indices. Using mock galaxies from the EAGLE simulations we find an optimal combination of the observational constraints that are required for robust measurement of the \(\mathrm{A}_\mathrm{mod}\) value of a galaxy: a column density threshold of \(5\times10^{19}cm^{-2}\) or lower at a minimal signal-to-noise of 3 and a galaxy resolved with at least 11 beams. We also use mock galaxies to investigate the effect of noise on the \(\mathrm{A}_\mathrm{flux}\) values and conclude that a global profile with signal-to-noise ratio greater than 5.5 is required to achieve a robust measurement of asymmetry. We investigate the relation between \(\mathrm{A}_\mathrm{mod}\) and \(\mathrm{A}_\mathrm{flux}\) indices and find them to be uncorrelated which implies that \(\mathrm{A}_\mathrm{flux}\) values cannot be used to predict morphological asymmetries in galaxies.
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subjects Asymmetry
Density
Galaxies
Morphology
Noise
Physics - Astrophysics of Galaxies
Robustness
Signal to noise ratio
Stars & galaxies
title Using EAGLE simulations to study the effect of observational constraints on the determination of HI asymmetries in galaxies
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