Thermal and nonthermal infrared emission from M87

Y. Shi, G. H. Rieke, D. C. Hines, K. D. Gordon, E. Egami

Research output: Contribution to journalArticle

28 Scopus citations

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 midinfrared 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.

Original languageEnglish (US)
Pages (from-to)781-789
Number of pages9
JournalAstrophysical Journal
Volume655
Issue number2 I
DOIs
StatePublished - Feb 1 2007

Keywords

  • Galaxies: active
  • Galaxies: individual (M87)
  • Galaxies: jets

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Shi, Y., Rieke, G. H., Hines, D. C., Gordon, K. D., & Egami, E. (2007). Thermal and nonthermal infrared emission from M87. Astrophysical Journal, 655(2 I), 781-789. https://doi.org/10.1086/510188