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We obtained Spitzer/IRAC 3.6-8 micron images of the nearby spiral galaxy NGC4258 to study possible interactions between dust and the radio jet. In ouranalysis we also included high-resolution radio continuum, H-alpha, CO, andX-ray data. Our data reveal that the 8 micron emission, believed to originatelargely from PAH molecules and hot dust, is an excellent tracer of the normalspiral structure in NGC 4258, and hence it originates from the galactic plane.We investigated the possibility of dust destruction by the radio jet bycalculating correlation coefficients between the 8 micron and radio continuumemissions along the jet in two independent ways, namely (i) fromwavelet-transformed maps of the original images at different spatial scales,and (ii) from one-dimensional intensity cuts perpendicular to the projectedpath of the radio jet on the sky. No definitive sign of a correlation (oranticorrelation) was detected on relevant spatial scales with either approach,implying that any dust destruction must take place at spatial scales that arenot resolved by our observations.

Lack of Interaction between the Dust Grains and the Anomalous Radio Jet in the Nearby Spiral Galaxy NGC 4258