NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-07-17 T04:15:42 PDT
Help | Comment | NED Home

For refcode 2011ApJ...732...40D:
Retrieve 18 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2011ApJ...732...40D Polycyclic Aromatic Hydrocarbons, Ionized Gas, and Molecular Hydrogen in Brightest Cluster Galaxies of Cool-core Clusters of Galaxies Donahue, Megan; de Messieres, Genevieve E.; O'Connell, Robert W.; Voit, G. Mark; Hoffer, Aaron; McNamara, Brian R.; Nulsen, Paul E. J. Abstract. We present measurements of 5-25 micron emission features of brightest cluster galaxies (BCGs) with strong optical emission lines in a sample of nine cool-core clusters of galaxies observed with the Infrared Spectrograph on board the Spitzer Space Telescope. These systems provide a view of dusty molecular gas and star formation, surrounded by dense, X-ray-emitting intracluster gas. Past work has shown that BCGs in cool-core clusters may host powerful radio sources, luminous optical emission-line systems, and excess UV, while BCGs in other clusters never show this activity. In this sample, we detect polycyclic aromatic hydrocarbons (PAHs), extremely luminous, rotationally excited molecular hydrogen line emission, forbidden line emission from ionized gas ([Ne II] and [Ne III]), and infrared continuum emission from warm dust and cool stars. We show here that these BCGs exhibit more luminous forbidden neon and H_2_ rotational line emission than star-forming galaxies with similar total infrared luminosities, as well as somewhat higher ratios of 70 micron/24 micron luminosities. Our analysis suggests that while star formation processes dominate the heating of the dust and PAHs, a heating process consistent with suprathermal electron heating from the hot gas, distinct from star formation, is heating the molecular gas and contributing to the heating of the ionized gas in the galaxies. The survival of PAHs and dust suggests that dusty gas is somehow shielded from significant interaction with the X-ray gas. Key words: dust, extinction, galaxies: clusters: intracluster medium, galaxies: starburst, infrared: galaxies
Retrieve 18 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home