M106: Anomalous Arms


Anomalous Arms show up in this multi-wavelength false-color composite image of M106 (NGC 4258).
In addition to the two well-known arms visible in visible and UV light, radio and x-ray images show two more, invisible (or visually very faint) spiral arms. Investigation with XMM-Newton, Chandra X-ray Observatory, and Spitzer Space Telescope have confirmed now that these arms are composed of gas heated by shock waves.

Credit: X-ray: NASA/CXC/Univ. of Maryland/A.S. Wilson et al.; Optical: Pal.Obs. DSS; IR: NASA/JPL-Caltech; VLA: NRAO/AUI/NSF

Chandra Press Release:
http://chandra.harvard.edu/photo/2007/ngc4258/

Spitzer Press Release:
http://www.spitzer.caltech.edu/Media/releases/ssc2007-06/
Image:
http://sscws1.ipac.caltech.edu/Imagegallery/image.php?image_name=ssc2007-06a

NASA GSFC Press Release:
http://www.nasa.gov/centers/goddard/news/topstory/2007/mystery_spiralarms.html

ESA XMM Newton Press Release:
http://www.esa.int/esaCP/SEMLVET4LZE_index_0.html

SEDS M106 page:
http://www.seds.org/messier/m/m106.html

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