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Physical Sciences and Mathematics Commons™
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Full-Text Articles in Physical Sciences and Mathematics
Star-Forming Or Starbursting? The Ultraviolet Conundrum, M Boquien, D Calzetti, R Kennicutt, D Dale, C Engelbracht, Kd Gordon, S Hong, Jc Lee, J Portouw
Star-Forming Or Starbursting? The Ultraviolet Conundrum, M Boquien, D Calzetti, R Kennicutt, D Dale, C Engelbracht, Kd Gordon, S Hong, Jc Lee, J Portouw
Astronomy Department Faculty Publication Series
Compared to starburst galaxies, normal star-forming galaxies have been shown to display a much larger dispersion of the dust attenuation at fixed reddening through studies of the IRX-β diagram (the IR/UV ratio "IRX" versus the UV color "β"). To investigate the causes of this larger dispersion and attempt to isolate second parameters, we have used GALEX UV, ground-based optical, and Spitzer infrared imaging of eight nearby galaxies, and examined the properties of individual UV and 24 μm selected star-forming regions. We concentrated on star-forming regions, in order to isolate simpler star formation histories than those that characterize whole galaxies. We …
Comparison Of H Alpha And Uv Star Formation Rates In The Local Volume: Systematic Discrepancies For Dwarf Galaxies, Jc Lee, Ag De Paz, C Tremonti, Rc Kennicutt, S Salim, M Bothwell, D Calzetti, J Dalcanton, D Dale, C Engelbracht, Sjjg Funes, B Johnson, S Sakai, E Skillman, L Van Zee, F Walter, D Weisz
Comparison Of H Alpha And Uv Star Formation Rates In The Local Volume: Systematic Discrepancies For Dwarf Galaxies, Jc Lee, Ag De Paz, C Tremonti, Rc Kennicutt, S Salim, M Bothwell, D Calzetti, J Dalcanton, D Dale, C Engelbracht, Sjjg Funes, B Johnson, S Sakai, E Skillman, L Van Zee, F Walter, D Weisz
Astronomy Department Faculty Publication Series
Using a complete sample of ~300 star-forming galaxies within 11 Mpc of the Milky Way, we evaluate the consistency between star formation rates (SFRs) inferred from the far ultraviolet (FUV) non-ionizing continuum and Hα nebular emission, assuming standard conversion recipes in which the SFR scales linearly with luminosity at a given wavelength. Our analysis probes SFRs over 5 orders of magnitude, down to ultra-low activities on the order of ~10-4 M sun yr-1. The data are drawn from the 11 Mpc Hα and Ultraviolet Galaxy Survey (11HUGS), which has obtained Hα fluxes from ground-based narrowband imaging, and UV fluxes from …
Observations Of Starburst Galaxies With Far-Ultraviolet Spectrographic Explorer: Galactic Feedback In The Local Universe, Jp Grimes, T Heckman, A Aloisi, D Calzetti, C Leitherer, Cl Martin, G Meurer, K Sembach, D Strickland
Observations Of Starburst Galaxies With Far-Ultraviolet Spectrographic Explorer: Galactic Feedback In The Local Universe, Jp Grimes, T Heckman, A Aloisi, D Calzetti, C Leitherer, Cl Martin, G Meurer, K Sembach, D Strickland
Astronomy Department Faculty Publication Series
We have analyzed FUSE (905-1187 Å) spectra of a sample of 16 local starburst galaxies. These galaxies cover almost three orders of magnitude in star-formation rates and over two orders of magnitude in stellar mass. Absorption features from the stars and interstellar medium are observed in all the spectra. The strongest interstellar absorption features are generally blue-shifted by ~ 50-300 km s–1, implying the almost ubiquitous presence of starburst-driven galactic winds in this sample. The outflow velocites increase with both the star-formation rate and the star-formation rate per unit stellar mass, consistent with a galactic wind, driven by the population …