Matches in SemOpenAlex for { <https://semopenalex.org/work/W1776834320> ?p ?o ?g. }
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- W1776834320 abstract "We present observations and analysis of an unusual [C ii] emission line in the very luminous quasi-stellar object (QSO) SDSS J155426.16+193703.0 at z ∼ 4.6. The line is extremely broad (full width at half-maximum 735 km s−1) and seems to have a flat-topped or double-peaked line profile. A velocity map of the line shows a gradient across the source that indicates large-scale rotation of star-forming gas. Together, the velocity map and line profile suggest the presence of a massive rotating disc with a dynamical mass |$M_mathrm{dyn}gtrsim 5times 10^{10} ,mathrm{M}_{odot }$|. Using the assumption of a rotating disc origin, we employ an empirical relation between galaxy disc circular velocity and bulge velocity dispersion (σ) to estimate that σ > 310 km s−1, subject to a correction for the unknown disc inclination. This result implies that this source is consistent with the local M–σ relation, or offset at most by an order of magnitude in black hole mass. In contrast, the assumption of a bulge origin for the [C ii] emission line would lead to a conclusion that the black hole is nearly two orders of magnitude more massive than predicted by the M–σ relation, similar to previous findings for other high-redshift QSOs. As disc rotation may be a common origin for [C ii] emission at high redshifts, these results stress that careful consideration of dynamical origins is required when using observations of this line to derive properties of high-redshift galaxies." @default.
- W1776834320 created "2016-06-24" @default.
- W1776834320 creator A5003616194 @default.
- W1776834320 creator A5039296934 @default.
- W1776834320 creator A5049491288 @default.
- W1776834320 creator A5063166132 @default.
- W1776834320 date "2015-07-01" @default.
- W1776834320 modified "2023-10-14" @default.
- W1776834320 title "ALMA detection of a disc-dominated [C ii] emission line at z=4.6 in the luminous QSO J1554+1937" @default.
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