Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21920707m&link_type=abstract
American Astronomical Society, AAS Meeting #219, #207.07
Astronomy and Astrophysics
Astronomy
Scientific paper
The presence of a cool, dense core in the intracluster medium indicates that cooling has dominated over feedback for the past few Gyr. The fraction of galaxy clusters which harbor cool cores is, thus, an important diagnostic of the heating/cooling balance across cosmic time. In this presentation, I will discuss recent work on the evolution of warm, optical line-emitting gas in the cores of galaxy clusters and how this can be used to indirectly probe the evolution of cool cores. Using optical spectra from the Sloan Digital Sky Survey, we find a strong decrease in the fraction of brightest cluster galaxies (BCGs) with optical line-emission from z=0 to z=0.3. At z > 0.3, there is evidence for an increase in the number of optically-emitting BCGs. We find that the evolving fraction of optically-emitting BCGs is in excellent agreement with the X-ray-determined cool core evolution over the range 0 < z < 0.6. This technique may allow for the identification of cool cores at high redshift, where X-ray-based methods are more challenging.
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