Thermal and Non-Thermal Infrared Emission from M87

Abstract

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.

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

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• Aromatic Features in AGN: Star-Forming Infrared Luminosity Function of AGN Host Galaxies
• Two-Temperature GRRMHD Simulations of M87
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• Mid-IR Variability and Dust Reverberation Mapping of Low-$z$ Quasars. I. Data, Methods and Basic Results
• Partitioning the Outburst Energy of a Low Eddington Accretion Rate AGN at the Center of an Elliptical Galaxy: the Recent 12 Myr History of the Supermassive Black Hole in M87
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• Ruling out thermal dark matter with a black hole induced spiky profile in the M87 galaxy
• Neutrino, $\gamma$-ray and cosmic ray fluxes from the core of the closest radio galaxies
• Probing the central black hole in M87 with gamma-rays
• An Infrared Study of the Large-scale Jet in Quasar PKS 1136-135
• Mid-infrared dust in two nearby radio galaxies, NGC 1316 (Fornax A) and NGC 612 (PKS 0131-36)
• The role of the synchrotron component in the mid infrared spectrum of M 87
• Infrared-red Cores in Nearby Elliptical Galaxies
• Spitzer IRAC Low Surface Brightness Observations of the Virgo Cluster
• The Herschel Virgo Cluster Survey. XV. Planck submillimetre sources in the Virgo Cluster
• The Infrared Jet in 3C31
• Searching for Nuclear Obscuration in the Infrared Spectra of Nearby FR I Radio Galaxies
• Constraining eV-scale axion-like particle dark matter: insights from the M87 Galaxy
• The far-infrared view of M87 as seen by the Herschel Space Observatory