SIMBAD references

2017MNRAS.465.3163S - Mon. Not. R. Astron. Soc., 465, 3163-3174 (2017/March-1)

Galactic synchrotron emissivity measurements between 250° < l < 355° from the GLEAM survey with the MWA.

SU H., HURLEY-WALKER N., JACKSON C.A., McCLURE-GRIFFITHS N.M., TINGAY S.J., HINDSON L., HANCOCK P., WAYTH R.B., GAENSLER B.M., STAVELEY-SMITH L., MORGAN J., JOHNSTON-HOLLITT M., LENC E., BELL M.E., CALLINGHAM J.R., DWARKANATH K.S., FOR B.-Q., KAPINSKA A.D., McKINLEY B., OFFRINGA A.R., PROCOPIO P., WU C. and ZHENG Q.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): cosmic rays - H II regions - Galaxy: structure - radio continuum: general - radio continuum: general

Errata: erratum vol. 472, p. 828 (2017)

Simbad objects: 54

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2021.04.20-11:28:14

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