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• W3106363616 abstract "Recently, it has been suggested that the CO line width (FWHM(CO)) is a surrogate for the bulge velocity dispersion ($sigma$) of the host galaxies of high-redshift quasars, and the black hole -- bulge ($M_{BH}-sigma$) relation obtained with this assumption departs significantly from the $M_{BH}-sigma$ relation in the local universe. In this study, we first present an investigation of the correlation between the CO line width and the bulge velocity dispersion using a sample of 33 nearby Seyfert galaxies. We find that the formula adopted in previous studies, $sigma=rm{FWHM(CO)}/2.35$, is generally not a good approximation. Using it, one may underestimate the value of bulge velocity dispersion significantly when the CO line is narrower than 400 $km s^{-1}$. By involving the galactic inclination angle $i$ as an additional parameter, we obtain a tight correlation between the inclination-corrected CO line width and the bulge velocity dispersion, namely, $rm {FWHM(CO)}/sin i=-67.16pm80.18+(3.62pm0.68)sigma$. Using this new relation, we can better estimate the bulge velocity dispersion from the CO line width if the galactic inclination is known. We apply this new relation to nine high-redshift quasars with CO line detections and find that they are consistent with the local $M_{BH}-sigma$ relation if their inclination angles are around $15^o$. The possible smaller inclinations of the high-redshift quasars are preferred because of their relatively greater likelihood of detection, and are also consistent with their relatively smaller CO line widths compared to submillimeter galaxies (SMGs) at high redshift having a similar total amount of molecular gas. Future observations are needed to confirm these results." @default.
• W3106363616 created "2020-11-23" @default.
• W3106363616 creator A5043641715 @default.
• W3106363616 date "2007-03-01" @default.
• W3106363616 modified "2023-09-25" @default.
• W3106363616 title "CO Line Width and the Black Hole–Bulge Relationship at High Redshift" @default.
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• W3106363616 doi "https://doi.org/10.1086/510835" @default.
• W3106363616 hasPublicationYear "2007" @default.
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