Host Galaxies of Luminous Quasars: Structural Properties and the Fundamental Plane - AstrophysicsReport as inadecuate

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Abstract: We present stellar velocity dispersion measurements in the host galaxies of10 luminous quasars M V < -23 using the Ca HandK lines in off-nuclear spectra.We combine these data with effective radii and magnitudes from the literatureto place the host galaxies on the Fundamental Plane FP where their propertiesare compared to other types of galaxies. We find that the radio-loud RL QSOhosts have similar properties to massive elliptical galaxies, while theradio-quiet RQ hosts are more similar to intermediate mass galaxies. The RLhosts lie at the upper extreme of the FP due to their large velocitydispersions = 321 km s^-1, low surface brightness = 20.8mag arcsec^-2, and large effective radii = 11.4 kpc, and have =1.5 x 10^12 M sun and = 12.4. In contrast, properties of the RQ hosts are = 241 km s^-1, ~ 4.4 x 10^11 M sun, and ~ 5.3. Thedistinction between these galaxies occurs at sigma * ~ 300 km s^-1, R e ~ 6kpc, and corresponding M * ~ 5.9 +- 3.5 x 10^11 M sun. Our data supportprevious results that PG QSOs are related to gas-rich galaxy mergers that formintermediate-mass galaxies, while RL QSOs reside in massive early-typegalaxies, most of which also show signs of recent mergers or interactions. Mostprevious work has drawn these conclusions by using estimates of the black holemass and inferring host galaxy properties from that, while here we have reliedpurely on directly measured host galaxy properties.

Author: Marsha J. Wolf, Andrew I. Sheinis University of Wisconsin - Madison


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