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:

Spitzer Press Release:

NASA GSFC Press Release:

ESA XMM Newton Press Release:

SEDS M106 page:


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