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The Spatial Homogeneity of Nebular and Stellar Oxygen Abundances in the Local Group Dwarf Irregular Galaxy NGC 6822
Henry Lee, Evan D. Skillman, Kim A. Venn
To test the existence of a possible radial gradient in oxygen abundances within the Local Group dwarf irregular galaxy NGC 6822, we have obtained optical spectra of 19 nebulae with…
Oxygen and Nitrogen in Leo A and GR 8
L. van Zee, E. D. Skillman, M. P. Haynes
We present elemental abundances for multiple HII regions in Leo A and GR 8 obtained from long slit optical spectroscopy of these two nearby low luminosity dwarf irregular galaxies.…
The Arecibo Legacy Fast ALFA Survey: I. Science Goals, Survey Design and Strategy
Riccardo Giovanelli, Martha P. Haynes, Brian R. Kent
The recently initiated Arecibo Legacy Fast ALFA (ALFALFA) survey aims to map 7000 square degrees of the high galactic latitude sky visible from Arecibo, providing a HI line spectra…
Star Formation Histories of Local Group Dwarf Galaxies
Andrew E. Dolphin, Daniel R. Weisz, Evan D. Skillman +1
We report preliminary results of a project to homogeneously measure star formation histories for the majority of Local Group dwarf galaxies, based on archival WFPC2 observations. F…
VLA Imaging of the Intriguing HI Cloud HIJASS J1021+6842 in the M81 Group
F. Walter, E. Skillman, E. Brinks
We present VLA HI 21cm observations of HIJASS J1021+6842 which has been discovered in the direction of the M81 group. Our synthesis imaging reveals that the HI is distributed over…
The Nature Of Radio Continuum Emission At Very Low Metallicity: Very Large Array Observations of I Zw 18
John M. Cannon, Fabian Walter, Evan D. Skillman +1
We present the first resolved study of the radio continuum properties of I Zw 18, the dwarf galaxy with the lowest known nebular metal abundance in the local universe. New Very Lar…