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The specific angular momentum of disc galaxies and its connection with galaxy morphology, bar structure, and disc gravitational instability
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- Romeo, Alessandro, 1961 (author)
- Chalmers University of Technology
-
- Agertz, Oscar (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Astrofysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science,Astrophysics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- Renaud, Florent (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Astrofysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science,Astrophysics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
- (creator_code:org_t)
- 2022-10-26
- 2023
- English.
- In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 518:1, s. 1002-1021
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- The specific angular momenta (j equivalent to J/M) of stars (j(star)), gas (j(gas)), baryons as a whole (j(b)) and dark matter haloes (j(h)) contain clues of vital importance about how galaxies form and evolve. Using one of the largest samples of disc galaxies (S0-BCD) with high-quality rotation curves and near-infrared surface photometry, we perform a detailed comparative analysis of j that stretches across a variety of galaxy properties. Our analysis imposes tight constraints on the 'retained' fractions of specific angular momentum (j(star)/j(h), j(Hi)/j(h), and j(b)/j(h)), as well as on their systematic trends with mass fraction and galaxy morphology, thus on how well specific angular momentum is conserved in the process of disc galaxy formation and evolution. In particular, one of the most innovative results of our analysis is the finding that galaxies with larger baryon fractions have also retained larger fractions of their specific angular momentum. Furthermore, our analysis demonstrates how challenging it is to characterize barred galaxies from a gravitational instability point of view. This is true not only for the popular Efstathiou, Lake & Negroponte bar instability criterion, which fails to separate barred from non-barred galaxies in about 55 percent of the cases, but also for the mass-weighted Toomre parameter of atomic gas, < Q(HI)>, which succeeds in separating barred from non-barred galaxies, but only in a statistical sense.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: haloes
- galaxies: ISM
- instabilities
- galaxies: kinematics and dynamics
- galaxies: fundamental parameters
- galaxies: stellar content
- galaxies: fundamental parameters
- galaxies: haloes
- galaxies: ISM
- galaxies: kinematics and dynamics
- galaxies: stellar content
- instabilities
Publication and Content Type
- art (subject category)
- ref (subject category)
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