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A Rare Encounter with Very Massive Stars in NGC 3125-A1
Aida Wofford, Claus Leitherer, Rupali Chandar +1
Super star cluster A1 in the nearby starburst galaxy NGC 3125 is characterized by broad He\ii \lam1640 emission (full width at half maximum, km s) of unpreced…
Extinction and Dust Geometry in M83 HII Regions: A Hubble Space Telescope/WFC3 Study
Guilin Liu, Daniela Calzetti, Sungryong Hong +7
We present HST/WFC3 narrow-band imaging of the starburst galaxy M83 targeting the hydrogen recombination lines (H, H and Pa), which we use to investigate the dust extincti…
Far-Ultraviolet Observations of Outflows from IR-Luminous Galaxies
Claus Leitherer, Rupali Chandar, Christy Tremonti +2
We obtained medium-resolution ultraviolet (UV) spectra between 1150 and 1450 Angstroms of the four UV-bright, infrared (IR)-luminous starburst galaxies IRAS F08339+6517, NGC 3256,…
Evidence for Two Distinct Stellar Initial Mass Functions : Revisiting the Effects of Cluster Dynamical Evolution
Dennis Zaritsky, Janet E. Colucci, Peter M. Pessev +2
We measure the velocity dispersions of six, galactic globular clusters using spatially integrated spectra, to test for the effects of internal dynamical evolution in the stellar ma…
An extended main sequence turn-off in the Small Magellanic Cloud star cluster NGC411
Leo Girardi, Paul Goudfrooij, Jason S. Kalirai +8
Based on new observations with the Wide Field Camera 3 onboard the Hubble Space Telescope, we report the discovery of an extended main sequence turn-off (eMSTO) in the intermediate…
An IMF Study of the Dwarf Starburst Galaxy NGC 4214
J. E. Andrews, D. Calzetti, R. Chandar +11
The production rate of ionizing photons in young < 8 Myr, unresolved stellar clusters in the nearby irregular galaxy NGC 4214 is probed using multi-wavelength Hubble Space Telescop…