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Mass-to-Light versus Color Relations for Dwarf Irregular Galaxies
Kimberly A. Herrmann, Deidre A. Hunter, Hong-Xin Zhang +1
We have determined new relations between colors and mass-to-light ratios () for dwarf irregular (dIrr) galaxies, as well as for transformed . These…
Outskirts of Nearby Disk Galaxies: Star Formation and Stellar Populations
Bruce G. Elmegreen, Deidre A. Hunter
The properties and star formation processes in the far-outer disks of nearby spiral and dwarf irregular galaxies are reviewed. The origin and structure of the generally exponential…
Kinematics of Extremely Metal-poor Galaxies: Evidence for Stellar Feedback
A. Olmo-Garcia, J. Sanchez Almeida, C. Munoz-Tunon +5
The extremely metal-poor (XMP) galaxies analyzed in a previous paper have large star-forming regions with a metallicity lower than the rest of the galaxy. Such a chemical inhomogen…
High-redshift major mergers weakly enhance star formation
J. Fensch, F. Renaud, F. Bournaud +11
Galaxy mergers are believed to trigger strong starbursts. This is well assessed by observations in the local Universe. However the efficiency of this mechanism has poorly been test…
The (dark) halo-to-stellar mass ratio in the Spitzer Survey of Stellar Structure in Galaxies (SG)
Simón Díaz-García, Heikki Salo, Eija Laurikainen +1
We use 3.6 m photometry for 1154 disk galaxies () in the Spitzer Survey of Stellar Structure in Galaxies (SG, Sheth et al. 2010) to obtain the stellar compon…
Near-exponential surface densities as hydrostatic, nonequilibrium profiles in galaxy discs
Curtis Struck, Bruce G. Elmegreen
Apparent exponential surface density profiles are nearly universal in galaxy discs across Hubble types, over a wide mass range, and a diversity of gravitational potential forms. Se…