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Paper: The Spitzer View of Jet-ISM Interactions
Volume: 386, Extragalactic Jets: Theory and Observation from Radio to Gamma Ray
Page: 15
Authors: Ogle, P.; Antonucci, R.; Leipski, C.; Appleton, P.; Whysong, D.
Abstract: Jet interactions with the host galaxy interstellar medium and surrounding intergalactic medium may have a significant impact on galaxy evolution. Such interactions can certainly have a large effect on the propagation and appearance of radio jets. Spitzer observations of radio galaxies give us a new way of assaying warm gas and dust content and probing jet-ISM interactions. We have discovered a new class of H2 emitting radio galaxies with the Spitzer IRS. The high-luminosity H2 emission comes from 108 − 109M of molecular gas heated to 100-1500 K by galaxy-scale shocks. In some cases, the H2 may be shock-heated by the radio jet. However, H2 emission galaxies are preferentially found in compact groups and galaxy clusters, where accretion shocks from gas stripped by galaxy collisions may be of primary importance. We present an overview of the gas content of radio galaxies and evidence for jet-ISM interactions, discuss individual sources with strong H2 emission, and speculate on their origins.
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