Sebastian, Biny and Bait, Omkar (2019) Radio Continuum Emission from Local Analogs of High- z Faint LAEs: Blueberry Galaxies. The Astrophysical Journal, 882 (2). L19. ISSN 2041-8213
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Abstract
We present a radio continuum study of a population of extremely young and starburst galaxies, termed as blueberries at ∼1 GHz using the upgraded Giant Metrewave Radio Telescope. We find that their radio-based star formation rate (SFR) is suppressed by a factor of ∼3.4 compared to the SFR based on optical emission lines. This might be due to (i) the young ages of these galaxies as a result of which a stable equilibrium via feedback from supernovae has not yet been established; (ii) escape of cosmic-ray electrons via diffusion or galactic-scale outflows. The estimated nonthermal fraction in these galaxies has a median value of ∼0.49, which is relatively lower than that in normal star-forming galaxies at such low frequencies. Their inferred equipartition magnetic field has a median value of 27 μG, which is higher than those in more evolved systems like spiral galaxies. Such high magnetic fields suggest that small-scale dynamo rather than large-scale dynamo mechanisms might be playing a major role in amplifying magnetic fields in these galaxies.
Item Type: | Article |
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Subjects: | Open Library Press > Physics and Astronomy |
Depositing User: | Unnamed user with email support@openlibrarypress.com |
Date Deposited: | 31 May 2023 05:52 |
Last Modified: | 28 May 2024 05:19 |
URI: | http://info.euro-archives.com/id/eprint/1467 |