Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-10-14
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
5 pages, 3 figures, 1 table, submitted
Scientific paper
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, low metallicity and very high star formation rates make Green Peas the nearby (z~0.2) analogs of the Lyman-break Galaxies (LBGs) which account for the bulk of the star formation in the early universe (z~2-5). They thus provide accessible laboratories in the nearby Universe for understanding star formation, supernova feedback, particle acceleration and magnetic field amplification in early galaxies. We report the first direct radio detection of Green Peas with low frequency GMRT observations and our stacking detection with archival VLA FIRST data. We show that the radio emission implies that these extremely young galaxies already have magnetic fields (>30 muG) even larger than that of the Milky Way. This is at odds with the present understanding of magnetic field growth based on amplification of seed fields by dynamo action over a galaxy's lifetime. Our observations strongly favor models with pregalactic magnetic fields at muG levels.
Cardamone Carolin
Chakraborti Sayan
Ray Alak
Yadav Naveen
No associations
LandOfFree
Radio Detection of Green Peas: Implications for Magnetic Fields in Young Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Radio Detection of Green Peas: Implications for Magnetic Fields in Young Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio Detection of Green Peas: Implications for Magnetic Fields in Young Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-523729