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http://hdl.handle.net/2289/6720
Title: | Galactic synchrotron emissivity measurements between 250° < l < 355° from the GLEAM survey with the MWA |
Authors: | Su, H. Hurley-Walker, N. Dwarakanath, K.S. +23 Co-authors |
Keywords: | Errata Erratum Cosmic rays |
Issue Date: | Mar-2017 |
Publisher: | Oxford University Press for the Royal Astronomical Society |
Citation: | Monthly Notices of the Royal Astronomical Society, 2017, Vol. 465, p3163-3174 |
Abstract: | Synchrotron emission pervades the Galactic plane at low radio frequencies, originating from cosmic ray electrons interacting with the Galactic magnetic field. Using a low-frequency radio telescope, the Murchison Widefield Array (MWA), we measure the free-free absorption of this Galactic synchrotron emission by intervening H II regions along the line of sight. These absorption measurements allow us to calculate the Galactic cosmic ray electron emissivity behind and in front of 47 detected H II regions in the region 250° < l < 355°, |b| < 2°. We find that all average emissivities between the H II regions and the Galactic edge along the line of sight (εb) are in the range of 0.39 ∼ 1.45 K pc-1 with a mean of 0.77 K pc-1 and a variance of 0.14 K pc-1 at 88 MHz. Our best model, the two-circle model, divides the Galactic disc into three regions using two circles centring on the Galactic Centre. It shows a high emissivity region near the Galactic Centre, a low emissivity region near the Galactic edge, and a medium emissivity region between these two regions, contrary to the trend found by previous studies. |
Description: | Open Access |
URI: | http://hdl.handle.net/2289/6720 |
ISSN: | 0035-8711 1365-2966 - (online) |
Alternative Location: | http://adsabs.harvard.edu/abs/2017MNRAS.465.3163S http://arxiv.org/abs/1611.05446 http://dx.doi.org/10.1093/mnras/stw2959 |
Copyright: | 2017 The authors & the Royal Astronomical Society |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2017_MNRAS_465_3163.pdf | Open Access | 4.57 MB | Adobe PDF | View/Open |
Erratum_2017_MNRAS_272_828-834.pdf | Open access | 522.73 kB | Adobe PDF | View/Open |
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