Newly Observed: Magnetic Fields Link Galaxies
by The Daily Galaxy (University of Sydney)
For the first time, astronomers have detected a magnetic field associated with the Magellanic Bridge, the filament of gas stretching 75 thousand light-years between the Milky Way Galaxy’s nearest galactic neighbors: the Large and Small Magellanic Clouds (LMC and SMC, respectively). “There were hints that this magnetic field might exist, but no one had observed it until now,” says Jane Kaczmarek, at the University of Sydney, and lead author of the paper describing the finding.
“Not only are entire galaxies magnetic, but the faint delicate threads joining galaxies are magnetic, too,” said Bryan Gaensler, Director of the Dunlap Institute for Astronomy & Astrophysics, University of Toronto, and a co-author on the paper. “Everywhere we look in the sky, we find magnetism.”
Visible in the southern night sky, the LMC and SMC are dwarf galaxies that orbit our home galaxy and lie at a distance of 160 and 200 thousand light-years from Earth respectively,
Such cosmic magnetic fields can only be detected indirectly, and this detection was made by observing the radio signals from hundreds of very distant galaxies that lie beyond the LMC and SMC. The observations were made with the Australia Telescope Compact Array radio telescope at the Paul Wild Observatory in New South Wales, Australia. This visible light mosaic below shows the LMC and SMC in context with the plane of our own galaxy, the Milky Way. (Axel Mellinger, Central Michigan University).
“The radio emission from the distant galaxies served as background ‘flashlights’ that shine through the Bridge,” says Kaczmarek. “Its magnetic field then changes the polarization of the radio signal. How the polarized light is changed tells us about the intervening magnetic field.”
[Editor: Again more proof that the universe is electric as magnetic fields exist only when there is a electrical current.]
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