Author Topic: New Peas paper  (Read 1375 times)

waveney

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New Peas paper
« on: October 17, 2011, 11:00:04 am »
A new paper about Radio detection of Peas has just been released.

Radio Detection of Green Peas: Implications for Magnetic Fields in Young Galaxies Authors: Sayan Chakraborti, Naveen Yadav, Carolin Cardamone, Alak Ray

This shows they have unexpectedly high magnetic fields.

Abstract:
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.

(I saw this from a message by Karen Masters)
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