Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714245t&link_type=abstract
American Astronomical Society, AAS Meeting #217, #142.45; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We report the results of analysis of a sample of 81 low-redshift quasar spectra drawn principally from the Sloan Digital Sky Survey. The spectra were chosen to have sufficiently narrow lines that the FeII multiplets can be discerned, and to be minimally contaminated by galaxy emission. We fit the spectra uniformly with a model consisting of a power law, FeII templates, and Balmer lines, and we include [OIII] even when we cannot identify the line in the spectrum by eye.
We confirm some previously known correlations, and find some new ones. We confirm a strong correlation between Hβ FWHM and monochromatic luminosity at 5500 Angstroms, but we also find a strong correlation between [OIII] FWHM and luminosity. We confirm a correlation between [OIII] blueshift and [OIII] FWHM, but we extend that correlation to larger blueshifts (up to 900 km/s) and larger velocity widths (up to >2000 km/s). This result is a consequence of our model fitting approach, and we note that the [OIII] component is generally statistically significant in the fit. We also confirm a strong correlation between power law slope and luminosity.
We investigate the properties of the Balmer lines in this sample using a Boltzmann plot approach. While the Balmer lines may not be emitted by thermal gas, we find that the temperature inferred is related to the Balmer line properties because objects with high temperatures exhibit Balmer continuum while objects with low temperatures do not. The derived temperature is weakly anticorrelated with luminosity and associated parameters, but there are no strong correlations with other parameters.
Additional analysis and results will be discussed. This research is funded by NSF AST-0707703.
Leighly Karen M.
Truitt Amanda
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