Other
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.2702k&link_type=abstract
American Astronomical Society, HEAD meeting #12, #27.02
Other
Scientific paper
The scaling relations of early-type galaxies are key observables which can be directly compared with theoretical models to better understand the evolution of the galaxies and their hot ISM. We revisit the scaling relations, using high spatial resolution Chandra observations of optical and X-ray selected early type galaxies, including a large fraction of gas-poor galaxies. We have accurately measured the X-ray properties of hot ISM, after carefully removing other individual emission components. In particular, we find a positive correlation between the luminosity and temperature of the hot ISM, significantly tighter than reported by earlier studies. This relation is particularly well defined in the subsample with σ>240 km/s, where it may be related to the analogous correlation found in cD galaxies and groups/clusters. However, the gas-poor galaxies with the shallowest potentials (σ < 200 km/s) also follow this relation, contrary to the expected anti-correlation in a simple outflow/wind scenario. Galaxies with intermediate values of σ instead tend to have the same kT, while Lx(gas) spans a factor of 20. We address the implications of our results in terms of theoretical predictions of the dynamical states of hot halos.
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