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A Search for Low Surface Brightness Structure Around Compact Narrow Emission Line Galaxies
Elizabeth J. Barton, Liese van Zee, Matthew A. Bershady
As the most extreme members of the rapidly evolving faint blue galaxy population at intermediate redshift, the compact narrow emission line galaxies (CNELGs) are intrinsically lumi…
Star Formation and the ISM in Four Dwarf Irregular Galaxies
L. M. Young, L. van Zee, K. Y. Lo +2
We present new, high sensitivity VLA observations of HI in four dwarf galaxies (UGCA 292, GR8, DDO 210, and DDO 216) and we use these data to study interactions between star format…
The Masses of Distant Galaxies from Optical Emission Line Widths
Elizabeth Barton Gillespie, Liese van Zee
Promising methods for studying galaxy evolution rely on optical emission line width measurements to compare intermediate-redshift objects to galaxies with equivalent masses at the…
Kinematic Constraints on Evolutionary Scenarios for Blue Compact Dwarf Galaxies : I. Neutral Gas Dynamics
Liese van Zee, John J. Salzer, Evan D. Skillman
We present the results of high spatial resolution HI synthesis observations of six blue compact dwarf (BCD) galaxies. Optically, the selected galaxies have smooth, symmetric isopho…
Possible Local Spiral Counterparts to Compact Blue Galaxies at Intermediate Redshift
Elizabeth J. Barton, Liese van Zee
We identify nearby disk galaxies with optical structural parameters similar to those of intermediate-redshift compact blue galaxies. By comparing HI and optical emission-line width…
The Evolutionary Status of Isolated Dwarf Irregular Galaxies II. Star Formation Histories and Gas Depletion
L. van Zee
The results of UBV and H alpha imaging of a large sample of isolated dwarf irregular galaxies are interpreted in the context of composite stellar population models. The observed op…
The Tully-Fisher Relation as a Measure of Luminosity Evolution: A Low Redshift Baseline for Evolving Galaxies
Elizabeth J. Barton, Margaret J. Geller, Benjamin C. Bromley +2
We use optical rotation curves to investigate the R-band Tully-Fisher properties of a sample of 90 spiral galaxies in close pairs. The galaxies follow the Tully-Fisher relation rem…
Discovery of An Extremely Metal--Poor Galaxy: Optical Spectroscopy of UGCA 292
L. van Zee
The results of optical spectroscopy of two HII regions in UGCA 292 (CVn I dwA) are presented. UGCA 292 is a nearby (D=3.1 Mpc) gas-rich dwarf irregular galaxy (M_H/L_B ~ 6.9) which…
Lopsidedness in dwarf irregular galaxies
Ana B. Heller, Noah Brosch, Elchanan Almoznino +3
We quantify the amplitude of the lopsidedness, the azimuthal angular asymmetry index, and the concentration of star forming regions, as represented by the distribution of the H…
Departures From Axisymmetric Morphology and Dynamics in Spiral Galaxies
David A. Kornreich, Martha P. Haynes, R. V. E. Lovelace +1
New HI synthesis data have been obtained for six face-on galaxies with the Very Large Array. These data and reanalyses of three additional data sets make up a sample of nine face-o…
Markarian 421's Unusual Satellite Galaxy
Peter W. Gorham, Liese van Zee, Stephen C. Unwin +1
We present Hubble Space Telescope (HST) imagery and photometry of the active galaxy Markarian 421 and its companion galaxy 14 arcsec to the ENE. The HST images indicate that the co…
Neutral Gas Distribution and Kinematics of the Nearly Face-on Spiral Galaxy NGC 1232
L. van Zee, J. Bryant
We have analyzed high velocity resolution HI synthesis observations of the nearly face-on Sc galaxy NGC 1232. The neutral gas distribution extends well beyond the optical extent of…
Spectroscopy of Outlying H II Regions in Spiral Galaxies: Abundances and Radial Gradients
L. van Zee, J. J. Salzer, M. P. Haynes +2
We present the results of low dispersion optical spectroscopy of 186 H II regions spanning a range of radius in 13 spiral galaxies. Abundances for several elements (oxygen, nitroge…
Neutral Gas Distributions and Kinematics of Five Blue Compact Dwarf Galaxies
L. van Zee, E. D. Skillman, J. J. Salzer
We present the results of high spatial resolution HI observations of five intrinsically compact dwarf galaxies which are currently experiencing a strong burst of star formation. Th…
Abundances in Spiral Galaxies: Evidence for Primary Nitrogen Production
L. van Zee, J. J. Salzer, M. P. Haynes
We present the results of nitrogen and oxygen abundance measurements for 185 HII regions spanning a range of radius in 13 spiral galaxies. As expected, the nitrogen-to-oxygen ratio…
The Complex Kinematics of the Neutral Hydrogen Associated with IZw18
L. van Zee, D. Westpfahl, M. P. Haynes +1
We present the results of high velocity and high spatial resolution HI synthesis observations of the blue compact dwarf galaxy IZw18 to investigate the link between its unique evol…