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Rings and Loops in the Stars: Stunning New Images from Planck Telescope

Wednesday, July 8, 2015 3:17

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A ring of dust 200 light years across and a loop covering a third of the sky: two of the results in a new map from the Planck satellite. Dr Mike Peel and Dr Paddy Leahy of the Jodrell Bank Centre for Astrophysics (JCBA) presented the images today at the National Astronomy Meeting (NAM 2015) at Venue Cymru, Llandudno, Wales.

An image of the ring around the star Lambda Orionis, made with the ESA Planck satellite. The ring, here seen in pink, is around 200 light years across. In the image red represents the anomalous microwave emission (AME), green represents the emission from interstellar plasma and the blue is emission arising from electrons moving in magnetic fields.

Credit: M. Peel / JCBA / Planck / ESA.

The European Space Agency (ESA) Planck satellite, launched in 2009 to study the ancient light of the Big Bang, has also given us maps of our own Galaxy, the Milky Way, in microwaves (radiation at cm- to mm-wavelengths). Microwaves are generated by electrons spiralling in the Galaxy’s magnetic field at nearly the speed of light (the synchrotron process); by collisions in interstellar plasma, by thermal vibration of interstellar dust grains, and by “anomalous” microwave emission (AME), which may be from spinning dust grains.

The relative strength of these processes changes with wavelength, and are separated using multi-wavelength measurements from Planck, from NASA’s WMAP satellite, and from ground-based radio telescopes, giving maps of each component.

The new maps show regions covering huge areas of our sky that produce AME; this process, only discovered in 1997, could account for a large amount of galactic microwave emission with a wavelength near 1 cm. One example where it is exceptionally bright is the 200 light year-wide dust ring around the Lambda Orionis nebula (the ‘head’ of the familiar Orion constellation). This is the first time the ring has been seen in this way.

A full sky map made using the ESA Planck satellite. Loop 1, marked by the dashed ellipse, is the yellow feature above centre, shading to purple, and the purple arc below centre. The colours represent the angle of the magnetic field and the brightness represents the signal strength.

Credit: M. Peel / JCBA / Planck / ESA.

A wide field map also shows synchrotron loops and spurs (where charged particles spiral around magnetic fields), including the huge Loop 1, discovered more than 50 years ago. Remarkably, astronomers are still very uncertain about its distance – it could be anywhere between 400 and 25,000 li

Contacts and sources:
Dr Robert Massey
Royal Astronomical Society (RAS)

Dr Mike Peel
Jodrell Bank Centre for Astrophysics

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