M66 as observed with the Spitzer Space Telescope as part of the SINGS.
The image is a four-channel false-color composite, where blue indicates
emission at 3.6 micrometers, green corresponds to 4.5 micrometers, and red to 5.8
and 8.0 micrometers. The contribution from starlight (measured at 3.6 micrometers)
in this picture has been subtracted from the 5.8 and 8 micrometer images
to enhance the visibility of the polycyclic aromatic hydrocarbon emissions.
^Rand, Richard J.; Wallin, John F. [http://adsabs.harvard.edu/cgi-bin/nph-bib_query? bibcode=2004ApJ...614..142R Pattern Speeds of BIMA SONG Galaxies with Molecule-dominated Interstellar Mediums Using the Tremaine-Weinberg Method]. The Astrophysical Journal. 2004, 614: 142–157.
^G. de Vaucouleurs, A. de Vaucouleurs, H. G. Corwin, R. J. Buta, G. Paturel, P. Fouque. Third Reference Catalogue of Bright Galaxies. New York: Springer-Verlag. 1991.