Submillimetre observations of the two-component magnetic field in M82

Kate Pattle; Walter Gear; Matt Redman; Matthew W.L. Smith; Jane Greaves

doi:10.1093/mnras/stab1300

Submillimetre observations of the two-component magnetic field in M82

Kate Pattle, Walter Gear, Matt Redman, Matthew W.L. Smith, Jane Greaves

Physics

Research output: Contribution to a Journal (Peer & Non Peer) › Article › peer-review

16 Citations (Scopus)

Abstract

We observed the starburst galaxy M82 in 850 μm polarized light with the POL-2 polarimeter on the James Clerk Maxwell Telescope (JCMT). We interpret our observed polarization geometry as tracing a two-component magnetic field: a poloidal component aligned with the galactic 'superwind', extending to a height ~350 pc above and below the central bar; and a spiral-arm-aligned, or possibly toroidal, component in the plane of the galaxy, which dominates the 850 μm polarized light distribution at galactocentric radii ≤2 kpc. Comparison of our results with recent High-resolution Airborne Wideband Camera Plus (HAWC+) measurements of the field in the dust entrained by the M82 superwind suggests that the superwind breaks out from the central starburst at ~350 pc above the plane of the galaxy.

Original language	English
Pages (from-to)	684-688
Number of pages	5
Journal	Monthly Notices of the Royal Astronomical Society
Volume	505
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stab1300
Publication status	Published - 1 Jul 2021

Keywords

Galaxies: individual: M82
Galaxies: magnetic fields
Submillimetre: galaxies

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10.1093/mnras/stab1300

Cite this

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title = "Submillimetre observations of the two-component magnetic field in M82",

abstract = "We observed the starburst galaxy M82 in 850 μm polarized light with the POL-2 polarimeter on the James Clerk Maxwell Telescope (JCMT). We interpret our observed polarization geometry as tracing a two-component magnetic field: a poloidal component aligned with the galactic 'superwind', extending to a height \textasciitilde{}350 pc above and below the central bar; and a spiral-arm-aligned, or possibly toroidal, component in the plane of the galaxy, which dominates the 850 μm polarized light distribution at galactocentric radii ≤2 kpc. Comparison of our results with recent High-resolution Airborne Wideband Camera Plus (HAWC+) measurements of the field in the dust entrained by the M82 superwind suggests that the superwind breaks out from the central starburst at \textasciitilde{}350 pc above the plane of the galaxy.",

keywords = "Galaxies: individual: M82, Galaxies: magnetic fields, Submillimetre: galaxies",

author = "Kate Pattle and Walter Gear and Matt Redman and Smith, \{Matthew W.L.\} and Jane Greaves",

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doi = "10.1093/mnras/stab1300",

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AU - Gear, Walter

AU - Redman, Matt

AU - Smith, Matthew W.L.

AU - Greaves, Jane

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AB - We observed the starburst galaxy M82 in 850 μm polarized light with the POL-2 polarimeter on the James Clerk Maxwell Telescope (JCMT). We interpret our observed polarization geometry as tracing a two-component magnetic field: a poloidal component aligned with the galactic 'superwind', extending to a height ~350 pc above and below the central bar; and a spiral-arm-aligned, or possibly toroidal, component in the plane of the galaxy, which dominates the 850 μm polarized light distribution at galactocentric radii ≤2 kpc. Comparison of our results with recent High-resolution Airborne Wideband Camera Plus (HAWC+) measurements of the field in the dust entrained by the M82 superwind suggests that the superwind breaks out from the central starburst at ~350 pc above the plane of the galaxy.

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KW - Galaxies: magnetic fields

KW - Submillimetre: galaxies

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Submillimetre observations of the two-component magnetic field in M82

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Keywords

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