The global magneto-ionic medium survey: A faraday depth survey of the northern sky covering 1280-1750 mhz

M. Wolleben; T. L. Landecker; K. A. Douglas; A. D. Gray; A. Ordog; J. M. Dickey; A. S. Hill; E. Carretti; J. C. Brown; B. M. Gaensler; J. L. Han; M. Haverkorn; R. Kothes; J. P. Leahy; N. McClure-Griffiths; D. McConnell; W. Reich; A. R. Taylor; A. J.M. Thomson; J. L. West

doi:10.3847/1538-3881/abf7c1

The global magneto-ionic medium survey: A faraday depth survey of the northern sky covering 1280-1750 mhz

M. Wolleben, T. L. Landecker^*, K. A. Douglas, A. D. Gray, A. Ordog, J. M. Dickey, A. S. Hill, E. Carretti, J. C. Brown, B. M. Gaensler, J. L. Han, M. Haverkorn, R. Kothes, J. P. Leahy, N. McClure-Griffiths, D. McConnell, W. Reich, A. R. Taylor, A. J.M. Thomson, J. L. West

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

The Galactic interstellar medium hosts a significant magnetic field, which can be probed through the synchrotron emission produced from its interaction with relativistic electrons. Linearly polarized synchrotron emission is generated throughout the Galaxy and, at longer wavelengths, modified along nearly every path by Faraday rotation in the intervening magneto-ionic medium. Full characterization of the polarized emission requires wideband observations with many frequency channels. We have surveyed polarized radio emission from the Northern sky over the range 1280-1750MHz, with channel width 236.8 kHz, using the John A. Galt Telescope (diameter 25.6 m) at the Dominion Radio Astrophysical Observatory, as part of the Global Magneto-Ionic Medium Survey. The survey covered 72% of the sky, decl. -30° to +87° at all R.A. The intensity scale was absolutely calibrated, based on the flux density and spectral index of Cygnus A. Polarization angle was calibrated using the extended polarized emission of the Fan Region. Data are presented as brightness temperatures with angular resolution 40'. Sensitivity in Stokes Q and U is 45 mK rms in a 1.18 MHz band. We have applied rotation measure synthesis to the data to obtain a Faraday depth cube of resolution 150 rad m-2 and sensitivity 3 mK rms of polarized intensity. Features in Faraday depth up to a width of 110 rad m-2 are represented. The maximum detectable Faraday depth is ±2 × 104 rad m-2. The survey data are available at the Canadian Astronomy Data Centre.

Original language	English
Article number	A5
Journal	Astronomical Journal
Volume	162
Issue number	1
DOIs	https://doi.org/10.3847/1538-3881/abf7c1
Publication status	Published - Jul 2021

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Wolleben, M., Landecker, T. L., Douglas, K. A., Gray, A. D., Ordog, A., Dickey, J. M., Hill, A. S., Carretti, E., Brown, J. C., Gaensler, B. M., Han, J. L., Haverkorn, M., Kothes, R., Leahy, J. P., McClure-Griffiths, N., McConnell, D., Reich, W., Taylor, A. R., Thomson, A. J. M., & West, J. L. (2021). The global magneto-ionic medium survey: A faraday depth survey of the northern sky covering 1280-1750 mhz. Astronomical Journal, 162(1), Article A5. https://doi.org/10.3847/1538-3881/abf7c1

@article{85d10edd49fa448d915ae161e184cd49,

title = "The global magneto-ionic medium survey: A faraday depth survey of the northern sky covering 1280-1750 mhz",

abstract = "The Galactic interstellar medium hosts a significant magnetic field, which can be probed through the synchrotron emission produced from its interaction with relativistic electrons. Linearly polarized synchrotron emission is generated throughout the Galaxy and, at longer wavelengths, modified along nearly every path by Faraday rotation in the intervening magneto-ionic medium. Full characterization of the polarized emission requires wideband observations with many frequency channels. We have surveyed polarized radio emission from the Northern sky over the range 1280-1750MHz, with channel width 236.8 kHz, using the John A. Galt Telescope (diameter 25.6 m) at the Dominion Radio Astrophysical Observatory, as part of the Global Magneto-Ionic Medium Survey. The survey covered 72% of the sky, decl. -30° to +87° at all R.A. The intensity scale was absolutely calibrated, based on the flux density and spectral index of Cygnus A. Polarization angle was calibrated using the extended polarized emission of the Fan Region. Data are presented as brightness temperatures with angular resolution 40'. Sensitivity in Stokes Q and U is 45 mK rms in a 1.18 MHz band. We have applied rotation measure synthesis to the data to obtain a Faraday depth cube of resolution 150 rad m-2 and sensitivity 3 mK rms of polarized intensity. Features in Faraday depth up to a width of 110 rad m-2 are represented. The maximum detectable Faraday depth is ±2 × 104 rad m-2. The survey data are available at the Canadian Astronomy Data Centre.",

author = "M. Wolleben and Landecker, {T. L.} and Douglas, {K. A.} and Gray, {A. D.} and A. Ordog and Dickey, {J. M.} and Hill, {A. S.} and E. Carretti and Brown, {J. C.} and Gaensler, {B. M.} and Han, {J. L.} and M. Haverkorn and R. Kothes and Leahy, {J. P.} and N. McClure-Griffiths and D. McConnell and W. Reich and Taylor, {A. R.} and Thomson, {A. J.M.} and West, {J. L.}",

note = "Publisher Copyright: {\textcopyright} 2021. The American Astronomical Society.",

year = "2021",

month = jul,

doi = "10.3847/1538-3881/abf7c1",

language = "English",

volume = "162",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "1",

}

Wolleben, M, Landecker, TL, Douglas, KA, Gray, AD, Ordog, A, Dickey, JM, Hill, AS, Carretti, E, Brown, JC, Gaensler, BM, Han, JL, Haverkorn, M, Kothes, R, Leahy, JP, McClure-Griffiths, N, McConnell, D, Reich, W, Taylor, AR, Thomson, AJM & West, JL 2021, 'The global magneto-ionic medium survey: A faraday depth survey of the northern sky covering 1280-1750 mhz', Astronomical Journal, vol. 162, no. 1, A5. https://doi.org/10.3847/1538-3881/abf7c1

TY - JOUR

T1 - The global magneto-ionic medium survey

T2 - A faraday depth survey of the northern sky covering 1280-1750 mhz

AU - Wolleben, M.

AU - Landecker, T. L.

AU - Douglas, K. A.

AU - Gray, A. D.

AU - Ordog, A.

AU - Dickey, J. M.

AU - Hill, A. S.

AU - Carretti, E.

AU - Brown, J. C.

AU - Gaensler, B. M.

AU - Han, J. L.

AU - Haverkorn, M.

AU - Kothes, R.

AU - Leahy, J. P.

AU - McClure-Griffiths, N.

AU - McConnell, D.

AU - Reich, W.

AU - Taylor, A. R.

AU - Thomson, A. J.M.

AU - West, J. L.

PY - 2021/7

Y1 - 2021/7

N2 - The Galactic interstellar medium hosts a significant magnetic field, which can be probed through the synchrotron emission produced from its interaction with relativistic electrons. Linearly polarized synchrotron emission is generated throughout the Galaxy and, at longer wavelengths, modified along nearly every path by Faraday rotation in the intervening magneto-ionic medium. Full characterization of the polarized emission requires wideband observations with many frequency channels. We have surveyed polarized radio emission from the Northern sky over the range 1280-1750MHz, with channel width 236.8 kHz, using the John A. Galt Telescope (diameter 25.6 m) at the Dominion Radio Astrophysical Observatory, as part of the Global Magneto-Ionic Medium Survey. The survey covered 72% of the sky, decl. -30° to +87° at all R.A. The intensity scale was absolutely calibrated, based on the flux density and spectral index of Cygnus A. Polarization angle was calibrated using the extended polarized emission of the Fan Region. Data are presented as brightness temperatures with angular resolution 40'. Sensitivity in Stokes Q and U is 45 mK rms in a 1.18 MHz band. We have applied rotation measure synthesis to the data to obtain a Faraday depth cube of resolution 150 rad m-2 and sensitivity 3 mK rms of polarized intensity. Features in Faraday depth up to a width of 110 rad m-2 are represented. The maximum detectable Faraday depth is ±2 × 104 rad m-2. The survey data are available at the Canadian Astronomy Data Centre.

AB - The Galactic interstellar medium hosts a significant magnetic field, which can be probed through the synchrotron emission produced from its interaction with relativistic electrons. Linearly polarized synchrotron emission is generated throughout the Galaxy and, at longer wavelengths, modified along nearly every path by Faraday rotation in the intervening magneto-ionic medium. Full characterization of the polarized emission requires wideband observations with many frequency channels. We have surveyed polarized radio emission from the Northern sky over the range 1280-1750MHz, with channel width 236.8 kHz, using the John A. Galt Telescope (diameter 25.6 m) at the Dominion Radio Astrophysical Observatory, as part of the Global Magneto-Ionic Medium Survey. The survey covered 72% of the sky, decl. -30° to +87° at all R.A. The intensity scale was absolutely calibrated, based on the flux density and spectral index of Cygnus A. Polarization angle was calibrated using the extended polarized emission of the Fan Region. Data are presented as brightness temperatures with angular resolution 40'. Sensitivity in Stokes Q and U is 45 mK rms in a 1.18 MHz band. We have applied rotation measure synthesis to the data to obtain a Faraday depth cube of resolution 150 rad m-2 and sensitivity 3 mK rms of polarized intensity. Features in Faraday depth up to a width of 110 rad m-2 are represented. The maximum detectable Faraday depth is ±2 × 104 rad m-2. The survey data are available at the Canadian Astronomy Data Centre.

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U2 - 10.3847/1538-3881/abf7c1

DO - 10.3847/1538-3881/abf7c1

M3 - Article

SN - 0004-6256

VL - 162

JO - Astronomical Journal

JF - Astronomical Journal

IS - 1

M1 - A5

ER -

The global magneto-ionic medium survey: A faraday depth survey of the northern sky covering 1280-1750 mhz

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