ALMA survey of a massive node of the Cosmic Web at z ∼ 3 - II. A dynamically cold and massive disk galaxy in the proximity of a hyper-luminous quasar

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Volume 701 (September 2025)

A&A, 701 (2025) A120

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Table 3.

Geometrical and kinematical best-fit parameters of the MQN01-QC galaxy disk.

Geometrical parameters from CANNUBI
Radial extent	4.1 ± 0.4 kpc ⁽¹⁾
Radial extent	0.54 ± 0.05 arcsec
Ring width ⁽²⁾ (arcsec)	$0 . 179_{- 0.016}^{+ 0.018}$ $0.179^{+0.018}_{-0.016}$
i (deg)	$40_{- 14}^{+ 10}$ $40^{+10}_{-14}$
PA (deg)	$193_{- 16}^{+ 19}$ $193^{+19}_{-16}$

Kinematical parameters from ^3DBAROLO

V_rot, max⁽³⁾ (km s⁻¹)	$513_{- 64}^{+ 58}$ $513^{+58}_{-64}$
$\bar{σ}$ $\bar{\sigma}$ ⁽⁴⁾ (km s⁻¹)	$46_{- 12}^{+ 12}$ $46^{+12}_{-12}$
$V_{rot, \max} / \bar{σ}$ $V_{\mathrm{rot, max}}/\bar{\sigma}$	$11_{- 3}^{+ 4}$ $11^{+4}_{-3}$

Kinematical parameters from GALPAK^3D

V_rot, max (km s⁻¹)	531 ± 4
σ₀⁽⁵⁾ (km s⁻¹)	54 ± 1
V_rot, max/σ₀	10.0 ± 0.2

Notes. ⁽¹⁾Disk radial extension obtained from the best-fit estimate of the radial separation of the annuli assuming z = 3.2475. ⁽²⁾The separation between rings corresponds to an oversampling of a factor of 1.6× of the synthesized beam minor axis. Hence, the parameters derived for each ring are not fully independent. ⁽³⁾Maximum disk rotational velocity. ⁽⁴⁾Radially averaged velocity dispersion of the disk. ⁽⁵⁾Intrinsic velocity dispersion of the disk. The reported errors on kinematical quantities do not take into account that on disk geometry and are therefore underestimated.

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