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The baryonic specific angular momentum of disc galaxies | | Pavel E. Mancera Piña
; Lorenzo Posti
; Filippo Fraternali
; Elizabeth A. K. Adams
; Tom Oosterloo
; | | Date: |
14 Sep 2020 | | Abstract: | (Abridged) Specific angular momentum is one of the key parameters controlling
the evolution of galaxies, and it is closely related with the coupling between
dark and visible matter. In this work we aim to derive the baryonic specific
angular momentum of disc galaxies and study its relation with the dark matter
specific angular momentum. Using a combination of high-quality HI rotation
curves and HI/near-IR surface densities, we homogeneously measure the stellar
($j_{
m *}$) and gas ($j_{
m gas}$) specific angular momentum for a large
sample of nearby disc galaxies. This allows us to determine the baryonic
specific angular momentum ($j_{
m bar}$) with high accuracy and across a very
wide range in mass. We confirm that the $j_{ast}-M_ast$ relation is an
unbroken power-law from $7 lesssim$ log($M_ast$/$M_odot) lesssim 11.5$,
with slope $0.54 pm 0.02$. Concerning the gas component, we find that the
$j_{
m gas}-M_{
m gas}$ relation is also an unbroken power-law from $6
lesssim$ log($M_{
m gas}$/$M_odot) lesssim 11$ with a steeper slope of
$1.01 pm 0.04$. Regarding the baryonic relation, our data supports a
correlation characterized by single power-law with slope $0.58 pm 0.02$. Our
analysis shows that our most massive spirals and smallest dwarfs lie along the
same $j_{
m bar}-M_{
m bar}$. While the relations are tight and unbroken, we
find internal correlations inside them: at fixed $M_ast$, galaxies with larger
$j_ast$ have larger disc scale lengths, and at fixed $M_{
m bar}$, gas-poor
galaxies have lower $j_{
m bar}$ than expected. We estimate the retained
fraction of baryonic specific angular momentum, finding it constant across all
our mass range, with a value of 0.7, indicating that the baryonic specific
angular momentum of present-day disc galaxies is comparable to the initial
specific angular momentum of their dark matter haloes. | | Source: | arXiv, 2009.06645 | | Services: | Forum | Review | PDF | Favorites | |
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