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• W3102974675 endingPage "146" @default.
• W3102974675 startingPage "146" @default.
• W3102974675 abstract "We study the baryon content of low mass galaxies selected from the Sloan Digital Sky Survey (SDSS DR8), focusing on galaxies in isolated environments where the complicating physics of galaxy-galaxy interactions are minimized. We measure neutral hydrogen (HI) gas masses and line-widths for 148 isolated galaxies with stellar mass between $10^7$ and $10^{9.5} M_{odot}$. We compare isolated low mass galaxies to more massive galaxies and galaxies in denser environments by remeasuring HI emission lines from the Arecibo Legacy Fast ALFA (ALFALFA) survey 40% data release. All isolated low mass galaxies either have large atomic gas fractions or large atomic gas fractions cannot be ruled out via their upper limits. We measure a median atomic gas fraction of $f_{rm gas} = 0.82 pm 0.13$ for our isolated low mass sample with no systems below 0.30. At all stellar masses, the correlations between galaxy radius, baryonic mass and velocity width are not significantly affected by environment. Finally, we estimate a median baryon to total dynamical mass fraction of $f_{rm baryon, disk} = 0.15 pm 0.18$. We also estimate two different median baryon to halo mass fractions using the results of semi-analytic models $(f_{rm baryon, halo} = 0.04 pm 0.06)$ and abundance matching $(f_{rm baryon, halo} = 0.04 pm 0.02)$. Baryon fractions estimated directly using HI observations appear independent of environment and maximum circular velocity, while baryon fractions estimated using abundance matching show a significant depletion of baryons at low maximum circular velocities." @default.
• W3102974675 created "2020-11-23" @default.
• W3102974675 creator A5008486123 @default.
• W3102974675 creator A5058540351 @default.
• W3102974675 creator A5071423709 @default.
• W3102974675 date "2015-08-19" @default.
• W3102974675 modified "2023-09-29" @default.
• W3102974675 title "A STUDY IN BLUE: THE BARYON CONTENT OF ISOLATED LOW-MASS GALAXIES" @default.
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