SIMBAD references

2015ApJ...809..146B - Astrophys. J., 809, 146 (2015/August-3)

A study in blue: the baryon content of isolated low-mass galaxies.

BRADFORD J.D., GEHA M.C. and BLANTON M.R.

Abstract (from CDS):

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 107 and. 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 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 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. We also estimate two different median baryon to halo mass fractions using the results of semi-analytic models and abundance matching. 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.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: ISM - galaxies: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/ApJ/809/146): table1.dat>

Simbad objects: 1719

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2015ApJ...809..146B and select 'bookmark this link' or equivalent in the popup menu


2021.08.04-20:21:45

© Université de Strasbourg/CNRS

    • Contact