Perusing the Planck 353 GHz polarisation Aitoff projection I noticed an apparent magnetically driven dust filament rising abruptly from the Galactic ß-field in the Chameleon-Mensa S polar region. It streams for ~25° before dwindling in Eridanus. It appears to be associated with Galactic cirrus clumps 80 PC below the disc plane. The
Planck 353 GHz image is here, and a quickie
Chromoscope survey in optical, NIR, FIT mm/µm, and 21 cm is here. It is mentioned in only a few papers incl. Besla/Martinez-Delgado 2015, but there has been no specific study of its unusual morphology. It looks like a magnetically driven jet but originates from a region devoid of high-energy activity. If it is a Birkeland current it is a very odd one. I wonder if it is an old SN 1a remnant of the Hercules Loop and Aquila Rift type based on faint extinction filaments in Schlegel 1998 S Polar projection and 4 other Planck Aitoff maps in different bandwidths which seem to suggest traces of an old circular feature typical of very old white dwarf SNRs.
Any suggestions?
=Dana in S Africa