Interstellar filaments in the Polaris Flare

Interstellar filaments in the Polaris Flare


03/01/2017 10:30 am


ESA and the SPIRE & PACS consortia, Ph. André (CEA Saclay) for the Gould’s Belt Survey Key Programme Consortium, and A. Abergel (IAS Orsay) for the Evolution of Interstellar Dust Key Programme Consortium


Just as the new calendar year begins, and with it a feeling of new beginnings, so this network of dust and gas shows a portion of sky where star birth is yet to take hold.

This area is known as the Polaris Flare, a region of dust and gas seen along the line of sight towards Polaris, the North Star in the constellation of Ursa Minor, and 490 light-years from Earth. It was imaged by ESA’s Herschel space observatory in 2011; a colour composite is presented here.

It shows several tens of tangled interstellar filaments. Such filaments can stretch for tens of light-years through space and can precede the onset of star formation, with newborn stars often found in the densest parts.

Embedded within the filaments are a number of denser patches of material, but hardly any currently appear to be the seeds of future stars. As they are now, the filaments are simply not massive enough to support star formation.

Whether or not this currently calm region becomes a stellar nursery in the future remains to be seen.

The region was imaged by Herschel’s Spectral and Photometric Imaging Receiver at infrared wavelengths of 250, 350 and 500 microns.

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