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24 April 2024 |
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Article overview
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CIV Line-Width Anomalies: The Perils of Low S/N Spectra | | Kelly D. Denney
; Richard W. Pogge
; Roberto J. Assef
; Christopher S. Kochanek
; Bradley M. Peterson
; Marianne Vestergaard
; | | Date: |
15 Mar 2013 | | Abstract: | Comparison of six high-redshift quasar spectra obtained with the Large
Binocular Telescope with previous observations from the Sloan Digital Sky
Survey shows that failure to correctly identify absorption and other problems
with accurate characterization of the CIV 1549 emission line profile in low S/N
data can severely limit the reliability of single-epoch mass estimates based on
the CIV emission line. We combine the analysis of these new high-quality data
with a reanalysis of three other samples based on high S/N spectra of the CIV
emission line region. We find that a large scatter between the Hbeta- and
CIV-based masses remains even for this high S/N sample when using the FWHM to
characterize the broad line region velocity dispersion. However, we demonstrate
that using high-quality data and the line dispersion to characterize the CIV
line width leads to a high level of consistency between CIV- and Hbeta-based
masses, with < 0.3 dex of scatter in the mass residuals. | | Source: | arXiv, 1303.3889 | | Services: | Forum | Review | PDF | Favorites | |
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