Thermal and Non-Thermal Infrared Emission from M87

Details Thermal and Non-Thermal Infrared Emission from M87 Thermal and Non-Thermal Infrared Emission from M87

2006-10-17

arxiv.org/abs/astro-ph/0610494v1

Astrophys.J.655:781-789,2007

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ, 15 pages, 7 figures. The high-resolution pdf is at http://cztsy.as.arizona.edu/~yong/M87.pdf

Scientific paper

10.1086/510188

We discuss images of M87 from 3.6 to 160 um obtained with Spitzer. As found previously, there is an excess in the far infrared over a simple power law interpolation from the radio to the resolved nonthermal features in the mid-infrared and optical. We show that this excess is most likely warm dust in the galaxy itself, and that the properties of this emission component are similar to the far infrared emission of normal giant elliptical galaxies. The new observations let us determine the spectrum of the jet and surrounding lobes of nonthermal emission. We find that even in the lobes the synchrotron break frequency is in the optical, probably requiring in situ particle acceleration not only in the jet but in the lobes as well.

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