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Title:
Thermal and Nonthermal Infrared Emission from M87
Authors:
Shi, Y.; Rieke, G. H.; Hines, D. C.; Gordon, K. D.; Egami, E.
Affiliation:
AA(Steward Observatory, University of Arizona, Tucson, AZ.), AB(Steward Observatory, University of Arizona, Tucson, AZ.), AC(Space Science Institute, Boulder, CO.), AD(Steward Observatory, University of Arizona, Tucson, AZ.), AE(Steward Observatory, University of Arizona, Tucson, AZ.)
Publication:
The Astrophysical Journal, Volume 655, Issue 2, pp. 781-789. (ApJ Homepage)
Publication Date:
02/2007
Origin:
UCP
ApJ Keywords:
Galaxies: Active, Galaxies: Individual: Messier Number: M87, Galaxies: Jets
DOI:
10.1086/510188
Bibliographic Code:
2007ApJ...655..781S

Abstract

We discuss images of M87 from 3.6 to 160 μm 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 due to 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 allow us to 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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