Angular momentum regulates HI gas content and HI central hole size in the discs of spirals

Chandrashekar Murugeshan, Virginia Kilborn, Danail Obreschkow, Karl Glazebrook, Katharina Lutz, Robert Džuďzar, Helga Dénes

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The neutral atomic hydrogen (H I) content of spiral galaxies has been observed to vary with environment,with moreHI-deficient spirals residing in high-density environments. This can be attributed to environmental effects such as ram pressure stripping and tidal interactions, which remove HI from the discs of galaxies. However, some spirals in low-density environments have also been observed to have relatively low HI mass fractions. The low densities of the intergalactic medium and lack of nearby galaxies in such environments make ram pressure stripping and tidal interactions unlikely candidates of gas removal. What then could be making these spirals HI deficient? Obreschkow et al. introduced a parameter-free model for the neutral atomic gas fraction (fatm), in a symmetric equilibrium disc as a function of the global atomic stability parameter (q), which depends on specific angular momentum. In order to examine if this model accounts for HI-deficient galaxies in low-density environments, we have used the MH I-MR scaling relation to select six HI-deficient spiral galaxies and observed them with the Australia Telescope Compact Array. By measuring their fatm and q values we find that the galaxies owe their observed HI deficiencies to low specific angular momenta. Additionally, we also find that the central HI hole sizes of our sample galaxies are related to their q values, following the prediction of Obreschkow et al. This result brings to light the importance of angular momentum in understanding the physics of the interstellar medium in the discs of galaxies and consequently their evolution.

Original languageEnglish
Pages (from-to)2398-2412
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume483
Issue number2
DOIs
Publication statusPublished - 1 Jan 2019

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angular momentum
galaxies
gases
gas
ram
spiral galaxies
stripping
intergalactic media
environmental effect
monatomic gases
neutral gases
physics
hydrogen
interactions
telescopes
scaling
prediction
predictions
parameter

Cite this

Murugeshan, Chandrashekar ; Kilborn, Virginia ; Obreschkow, Danail ; Glazebrook, Karl ; Lutz, Katharina ; Džuďzar, Robert ; Dénes, Helga. / Angular momentum regulates HI gas content and HI central hole size in the discs of spirals. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 483, No. 2. pp. 2398-2412.
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Angular momentum regulates HI gas content and HI central hole size in the discs of spirals. / Murugeshan, Chandrashekar; Kilborn, Virginia; Obreschkow, Danail; Glazebrook, Karl; Lutz, Katharina; Džuďzar, Robert; Dénes, Helga.

In: Monthly Notices of the Royal Astronomical Society, Vol. 483, No. 2, 01.01.2019, p. 2398-2412.

Research output: Contribution to journalArticle

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T1 - Angular momentum regulates HI gas content and HI central hole size in the discs of spirals

AU - Murugeshan, Chandrashekar

AU - Kilborn, Virginia

AU - Obreschkow, Danail

AU - Glazebrook, Karl

AU - Lutz, Katharina

AU - Džuďzar, Robert

AU - Dénes, Helga

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N2 - The neutral atomic hydrogen (H I) content of spiral galaxies has been observed to vary with environment,with moreHI-deficient spirals residing in high-density environments. This can be attributed to environmental effects such as ram pressure stripping and tidal interactions, which remove HI from the discs of galaxies. However, some spirals in low-density environments have also been observed to have relatively low HI mass fractions. The low densities of the intergalactic medium and lack of nearby galaxies in such environments make ram pressure stripping and tidal interactions unlikely candidates of gas removal. What then could be making these spirals HI deficient? Obreschkow et al. introduced a parameter-free model for the neutral atomic gas fraction (fatm), in a symmetric equilibrium disc as a function of the global atomic stability parameter (q), which depends on specific angular momentum. In order to examine if this model accounts for HI-deficient galaxies in low-density environments, we have used the MH I-MR scaling relation to select six HI-deficient spiral galaxies and observed them with the Australia Telescope Compact Array. By measuring their fatm and q values we find that the galaxies owe their observed HI deficiencies to low specific angular momenta. Additionally, we also find that the central HI hole sizes of our sample galaxies are related to their q values, following the prediction of Obreschkow et al. This result brings to light the importance of angular momentum in understanding the physics of the interstellar medium in the discs of galaxies and consequently their evolution.

AB - The neutral atomic hydrogen (H I) content of spiral galaxies has been observed to vary with environment,with moreHI-deficient spirals residing in high-density environments. This can be attributed to environmental effects such as ram pressure stripping and tidal interactions, which remove HI from the discs of galaxies. However, some spirals in low-density environments have also been observed to have relatively low HI mass fractions. The low densities of the intergalactic medium and lack of nearby galaxies in such environments make ram pressure stripping and tidal interactions unlikely candidates of gas removal. What then could be making these spirals HI deficient? Obreschkow et al. introduced a parameter-free model for the neutral atomic gas fraction (fatm), in a symmetric equilibrium disc as a function of the global atomic stability parameter (q), which depends on specific angular momentum. In order to examine if this model accounts for HI-deficient galaxies in low-density environments, we have used the MH I-MR scaling relation to select six HI-deficient spiral galaxies and observed them with the Australia Telescope Compact Array. By measuring their fatm and q values we find that the galaxies owe their observed HI deficiencies to low specific angular momenta. Additionally, we also find that the central HI hole sizes of our sample galaxies are related to their q values, following the prediction of Obreschkow et al. This result brings to light the importance of angular momentum in understanding the physics of the interstellar medium in the discs of galaxies and consequently their evolution.

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KW - Galaxies: fundamental parameters

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KW - Galaxies: kinematics and dynamics

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