2012ApJ...746L...6C


Query : 2012ApJ...746L...6C

2012ApJ...746L...6C - Astrophys. J., 746, L6 (2012/February-2)

Radio detection of green peas: implications for magnetic fields in young galaxies.

CHAKRABORTI S., YADAV N., CARDAMONE C. and RAY A.

Abstract (from CDS):

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 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 Giant Metrewave Radio Telescope observations and our stacking detection with archival Very Large Array FIRST data. We show that the radio emission implies that these extremely young galaxies already have magnetic fields ( ≳ 30 µG) 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 µG levels.

Abstract Copyright:

Journal keyword(s): cosmic rays - galaxies: magnetic fields - galaxies: starburst - radio continuum: galaxies

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1345 1
2 ICRF J074110.7+311200 Sy1 07 41 10.7032630079 +31 12 00.232776104   17.02 16.89 16.322   ~ 424 1
3 3XMM J074936.7+333717 G 07 49 36.7733934280 +33 37 16.394890666           ~ 10 0
4 3XMM J082247.4+224145 G 08 22 47.6719030299 +22 41 44.101339545           ~ 14 0
5 QSO B0839+187 QSO 08 42 05.09417058 +18 35 40.9905528   16.63 16.36 16.56   ~ 168 2
6 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3948 2
7 FIRST J133926.7+151655 Rad 13 39 26.7 +15 16 55           ~ 1 0
8 NVSS J141604+344436 Rad 14 16 04.18623 +34 44 36.4281           ~ 91 1
9 SDSS J142405.72+421646.3 EmG 14 24 05.7326459184 +42 16 46.261788537           ~ 18 0

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2021.11.30-01:00:01

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