Angular momentum regulates H i gas content and H i central hole size in the discs of spirals
| العنوان: | Angular momentum regulates H |
|---|---|
| المؤلفون: | Virginia A. Kilborn, Karl Glazebrook, K. A. Lutz, C. Murugeshan, H. Dénes, Danail Obreschkow, Robert Džudžar |
| المساهمون: | Observatoire astronomique de Strasbourg (ObAS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) |
| المصدر: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2019, 483 (2), pp.2398-2412. ⟨10.1093/mnras/sty3265⟩ |
| بيانات النشر: | Oxford University Press (OUP), 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Angular momentum, Hydrogen, kinematics and dynamics, FOS: Physical sciences, chemistry.chemical_element, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Specific relative angular momentum, galaxies, 0103 physical sciences, 010303 astronomy & astrophysics, Scaling, Astrophysics::Galaxy Astrophysics, Physics, Spiral galaxy, fundamental parameters -galaxies, 010308 nuclear & particles physics, Astronomy and Astrophysics, ISMgalaxies, Astrophysics - Astrophysics of Galaxies, Galaxy, Ram pressure, evolution -galaxies, Interstellar medium, chemistry, [SDU]Sciences of the Universe [physics], Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA) |
| الوصف: | The neutral atomic hydrogen (HI) content of spiral galaxies has been observed to vary with environment, with more HI-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 ($f_{atm}$), 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 $M_{HI} ~-$ M$_{R}$ scaling relation to select six HI-deficient spiral galaxies and observed them with the ATCA. By measuring their $f_{atm}$ 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. Comment: 17 pages, 11 figures, accepted for publication in MNRAS |
| تدمد: | 1365-2966 0035-8711 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::604b427f50f15e00199892df9f589466 https://doi.org/10.1093/mnras/sty3265 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....604b427f50f15e00199892df9f589466 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13652966 00358711 |
|---|