RADIO DETECTION OF GREEN PEAS: IMPLICATIONS FOR MAGNETIC FIELDS IN YOUNG GALAXIES

摘要: Green Peas are a new class of young, emission line galaxies that were discovered by citizen volunteers in the Galaxy Zoo project. Their low stellar mass, metallicity, and very high star formation rates make nearby (z ~ 0.2) analogs Lyman break which account for bulk early universe 2-5). They thus provide accessible laboratories understanding formation, supernova feedback, particle acceleration, magnetic field amplification galaxies. We report first direct radio detection with frequency Giant Metrewave Radio Telescope observations our stacking archival Very Large Array FIRST data. show implies these extremely young already have fields ( 30 μG) even larger than Milky Way. This is at odds present growth based on seed dynamo action over galaxy's lifetime. Our strongly favor models pregalactic μG levels.