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Title: DO BARYONS ALTER THE HALOS OF LOW SURFACE BRIGHTNESS GALAXIES?

Abstract

High-quality observations of dark-matter-dominated low surface brightness (LSB) galaxies indicate that, in contrast to the triaxial, centrally concentrated cuspy halos formed in collisionless simulations of halo assembly, these galaxies reside in round, roughly constant density cored halos. In order to reconcile these data with galaxy formation in the context of {Lambda}CDM, processes that alter the shape and density structure of the inner halo are required. We compile observational properties of LSB galaxies to evaluate the plausibility that a previously higher baryonic mass content and feedback from star formation can modify the dark matter halos of these galaxies. We also compare the properties of bulgeless disk galaxies formed in recent simulations to the LSB galaxy sample. We find that observational constraints on LSB galaxy star formation histories, structure, and kinematics make it difficult for baryonic physics to sphericalize and decrease the central density of the dark matter halos of LSB galaxies.

Authors:
;  [1]
  1. Department of Physics, Royal Military College of Canada, P.O. Box 17000, Station Forces, Kingston, ON K7K 7B4 (Canada)
Publication Date:
OSTI Identifier:
22047380
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 741; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BARYONS; BRIGHTNESS; COMPARATIVE EVALUATIONS; COSMOLOGY; DENSITY; FEEDBACK; GALAXIES; MASS; NONLUMINOUS MATTER; SHAPE; SPHERICAL CONFIGURATION; STAR EVOLUTION; STARS; SURFACES

Citation Formats

De Naray, Rachel Kuzio, and Spekkens, Kristine. DO BARYONS ALTER THE HALOS OF LOW SURFACE BRIGHTNESS GALAXIES?. United States: N. p., 2011. Web. doi:10.1088/2041-8205/741/2/L29.
De Naray, Rachel Kuzio, & Spekkens, Kristine. DO BARYONS ALTER THE HALOS OF LOW SURFACE BRIGHTNESS GALAXIES?. United States. https://doi.org/10.1088/2041-8205/741/2/L29
De Naray, Rachel Kuzio, and Spekkens, Kristine. 2011. "DO BARYONS ALTER THE HALOS OF LOW SURFACE BRIGHTNESS GALAXIES?". United States. https://doi.org/10.1088/2041-8205/741/2/L29.
@article{osti_22047380,
title = {DO BARYONS ALTER THE HALOS OF LOW SURFACE BRIGHTNESS GALAXIES?},
author = {De Naray, Rachel Kuzio and Spekkens, Kristine},
abstractNote = {High-quality observations of dark-matter-dominated low surface brightness (LSB) galaxies indicate that, in contrast to the triaxial, centrally concentrated cuspy halos formed in collisionless simulations of halo assembly, these galaxies reside in round, roughly constant density cored halos. In order to reconcile these data with galaxy formation in the context of {Lambda}CDM, processes that alter the shape and density structure of the inner halo are required. We compile observational properties of LSB galaxies to evaluate the plausibility that a previously higher baryonic mass content and feedback from star formation can modify the dark matter halos of these galaxies. We also compare the properties of bulgeless disk galaxies formed in recent simulations to the LSB galaxy sample. We find that observational constraints on LSB galaxy star formation histories, structure, and kinematics make it difficult for baryonic physics to sphericalize and decrease the central density of the dark matter halos of LSB galaxies.},
doi = {10.1088/2041-8205/741/2/L29},
url = {https://www.osti.gov/biblio/22047380}, journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 741,
place = {United States},
year = {Thu Nov 10 00:00:00 EST 2011},
month = {Thu Nov 10 00:00:00 EST 2011}
}