473 citations · 1.1k across the 8 of their papers we have counts for
8 papers
Rescuing the Initial Mass Function for Arp 78
Ralf Kotulla, Uta Fritze, John S Gallagher
We present deep R and narrow-band Halpha images of Arp 78 obtained with the WIYN 3.5-m telescope on Kitt Peak. GALEX observations had shown a very extended UV structure for this sy…
Deep Optical Imaging of Starbursting "Transition" Dwarf Galaxies
Kate E. Dellenbusch, John S. Gallagher, Patricia M. Knezek +1
A subgroup of dwarf galaxies have characteristics of a possible evolutionary transition between star-forming systems and dwarf ellipticals. These systems host significant starburst…
Leo A: A Late-Blooming Survivor of the Epoch of Reionization in the Local Group
A. A. Cole, E. D. Skillman, E. Tolstoy +8
As part of a major program to use isolated Local Group dwarf galaxies as near-field probes of cosmology, we have obtained deep images of the dwarf irregular galaxy Leo A with the A…
Spectroscopy of Red Giants in the LMC Bar: Abundances, Kinematics, and the Age-Metallicity Relation
Andrew A. Cole, E. Tolstoy, J. S. Gallagher +1
We report metallicities and radial velocities derived from spectra at the near-infrared calcium triplet for 373 red giants in a 200 square arcminute area at the optical center of t…
The Recent Cluster Formation Histories of NGC 5253 and NGC 3077: Environmental Impact on Star Formation
J. Harris, D. Calzetti, J. S. Gallagher +2
We present multicolor photometry of bright star cluster candidates in the nearby starburst galaxies NGC 3077 and NGC 5253, observed with the Hubble Space Telescope Wide Field and P…
The Progenitors of Dwarf Spheroidal Galaxies
Eva K. Grebel, John S. Gallagher, Daniel Harbeck
Dwarf spheroidal (dSph) galaxies present an evolutionary puzzle that we explore in 40 early- and late-type dwarfs in the Local Group and nearby field. Although dSphs formed stars o…