The Distribution of Star Formation and Metals in the Low Surface Brightness Galaxy UGC 628
| Autor: | Sharon X. Wang, Rachel Kuzio de Naray, J. E. Young |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Physics
Stellar population Star formation Metallicity Surface brightness fluctuation Low-surface-brightness galaxy Astronomy FOS: Physical sciences Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Solar and Stellar Astrophysics Surface brightness Astrophysics::Earth and Planetary Astrophysics Disc Astrophysics::Galaxy Astrophysics |
| Popis: | We introduce the MUSCEL Program (MUltiwavelength observations of the Structure, Chemistry and Evolution of LSB galaxies), a project aimed at determining the star-formation histories of low surface brightness galaxies. MUSCEL utilizes ground-based optical spectra and space-based UV and IR photometry to fully constrain the star-formation histories of our targets with the aim of shedding light on the processes that led low surface brightness galaxies down a different evolutionary path from that followed by high surface brightness galaxies, such as our Milky Way. Here we present the spatially-resolved optical spectra of UGC 628, observed with the VIRUS-P IFU at the 2.7-m Harlen J. Smith Telescope at the McDonald Observatory, and utilize emission-line diagnostics to determine the rate and distribution of star formation as well as the gas-phase metallicity and metallicity gradient. We find highly clustered star formation throughout UGC 628, excluding the core regions, and a log(O/H) metallicity around -4.2, with more metal rich regions near the edges of the galactic disk. Based on the emission-line diagnostics alone, the current mode of star formation, slow and concentrated in the outer disk, appears to have dominated for quite some time, although there are clear signs of a much older stellar population formed in a more standard inside-out fashion. 13 pages, 7 figures |
| Databáze: | OpenAIRE |
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