Star Formation in the Low Surface Brightness Galaxies: a Comparison with the Outer Regions of Normal Galaxies
Abstract
Low surface brightness galaxies (LSB-galaxies) and the outer regions of disks of "normal" surface brightness galaxies (HSB-galaxies) are compared in terms of the radial distributions of star formation rates and efficiencies, as well as the Toomre stability parameter QT, using data from several samples of galaxies with high HI content. It is shown that the dependences of the star formation rate SFR on the HI surface density and the star formation efficiency SFE on the disk optical brightness μg for LSB- and HSB-galaxies have a similar character, suggesting similarity in the conditions that determine the star formation rate in low gas density regions. The considered dependences persist out to distances corresponding to brightnesses of 26-27 mag/arcsec2, where the expected volume density of the equilibrium gas layer should be very low. It is suggested that the disk density at large distances from the center may be significantly underestimated.
Related
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- The connection between surface brightness and satellite systems for central galaxies through IllustrisTNG (Corrigendum)
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BibTeX
@misc{zasov2026star,
title = {{Star Formation in the Low Surface Brightness Galaxies: a Comparison with the Outer Regions of Normal Galaxies}},
author = {Anatoly Zasov and Natalia Zaitseva and Anna Saburova},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.09803},
eprint = {2610.09803},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.09803},
}
RIS
TY - UNPB
TI - Star Formation in the Low Surface Brightness Galaxies: a Comparison with the Outer Regions of Normal Galaxies
AU - Anatoly Zasov
AU - Natalia Zaitseva
AU - Anna Saburova
PY - 2026
DA - 2026/10/07
PB - arXiv
DO - 10.48550/arxiv.2610.09803
UR - https://arxiv.org/abs/2610.09803
AB - Low surface brightness galaxies (LSB-galaxies) and the outer regions of disks of "normal" surface brightness galaxies (HSB-galaxies) are compared in terms of the radial distributions of star formation rates and efficiencies, as well as the Toomre stability parameter Q_T, using data from several samples of galaxies with high HI content. It is shown that the dependences of the star formation rate SFR on the HI surface density and the star formation efficiency SFE on the disk optical brightness μ_g for LSB- and HSB-galaxies have a similar character, suggesting similarity in the conditions that determine the star formation rate in low gas density regions. The considered dependences persist out to distances corresponding to brightnesses of 26-27 mag/arcsec^2, where the expected volume density of the equilibrium gas layer should be very low. It is suggested that the disk density at large distances from the center may be significantly underestimated.
ER -