Stellar angular momentum distribution linked to galaxy morphology

We study the spatially-resolved stellar specific angular momentum \(j_*\) in a high-quality sample of 24 CALIFA galaxies covering a broad range of visual morphology, accounting for stellar velocity and velocity dispersion. The shape of the spaxel-wise probability density function of normalised \(s=j...

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Bibliographic Details
Published in:arXiv.org 2020-04
Main Authors: Sweet, Sarah M, Glazebrook, Karl, Obreschkow, Danail, Fisher, Deanne B, Burkert, Andreas, Lagos, Claudia D P, Espejo Salcedo, Juan M
Format: Article
Language:English
Subjects:
Angular momentum
Baryons
Dark matter
Galactic evolution
Galaxy distribution
Kinematics
Morphology
Normal distribution
Photometry
Probability density functions
Star & galaxy formation
Stars & galaxies
Statistical analysis
Stellar mass
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Summary:We study the spatially-resolved stellar specific angular momentum \(j_*\) in a high-quality sample of 24 CALIFA galaxies covering a broad range of visual morphology, accounting for stellar velocity and velocity dispersion. The shape of the spaxel-wise probability density function of normalised \(s=j_*/j_{*mean}\), PDF(\(s\)), deviates significantly from the near-universal initial distribution expected of baryons in a dark matter halo and can be explained by the expected baryonic effects in galaxy formation that remove and redistribute angular momentum. Further we find that the observed shape of the PDF(\(s\)) correlates significantly with photometric morphology, where late-type galaxies have PDF(\(s\)) that is similar to a normal distribution, whereas early types have a strongly-skewed PDF(\(s\)) resulting from an excess of low-angular momentum material. Galaxies that are known to host pseudobulges (bulge Sersic index \(n_b
ISSN:2331-8422
DOI:10.48550/arxiv.2004.08182