The “C”: The large Chameleon-Musca-Coalsack cloud

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Table 1.

Key properties of the C.

	Cartesian Position	Spherical Position	Radius	FWHM	Inclination	Mass
C	$\begin{matrix} 20 pc \leq X \leq 230 pc \\ - 240 pc \leq Y \leq - 90 pc \\ - 185 pc \leq Z \leq 50 pc \end{matrix}$ $\begin{array}{c} 20\,\mathrm{pc} \leq X \leq 230\,\mathrm{pc} \\ -240\,\mathrm{pc} \leq Y \leq -90\,\mathrm{pc} \\ -185\,\mathrm{pc} \leq Z \leq 50\,\mathrm{pc} \end{array}$	$\begin{matrix} 275 ° \leq l \leq 335 ° \\ - 40 ° \leq b \leq 15 ° \\ 165 pc \leq d \leq 220 pc \end{matrix}$ $\begin{array}{c} 275^\circ \leq l \leq 335^\circ \\ -40^\circ \leq b \leq 15^\circ\\ 165\,\mathrm{pc} \leq d \leq 220\,\mathrm{pc} \end{array}$	$\begin{matrix} 48 pc \\ (all samples) \end{matrix}$ $\begin{array}{c} 48\,\mathrm{pc} \\ (\mathrm{all\,samples}) \end{array}$	$\begin{matrix} 29.5 \pm 1 pc \\ - \\ 76 \pm 0.5 pc \end{matrix}$ $\begin{array}{c} 29.5 \pm 1\,\mathrm{pc} \\ {-} \\ 76\pm0.5\,\mathrm{pc} \end{array}$	72 ± 1°	$\begin{matrix} (50.5 \pm 0.3) \times 10^{3} M_{⊙} \\ in isodensity surface \end{matrix}$ $\begin{array}{c} (50.5\pm0.3)\times10^{3}\,{M}_{\odot}\\ \mathrm{in\,isodensity\,surface} \end{array}$
Center	$\begin{matrix} X = 137 pc \\ Y = - 140 pc \\ Z = - 33 pc \end{matrix}$ $\begin{array}{c} X=137\,\mathrm{pc}\\ Y=-140\,\mathrm{pc}\\ Z=-33\,\mathrm{pc} \end{array}$	$\begin{matrix} l = 314.6 ° \\ b = - 9.5 ° \\ d = 199.3 pc \end{matrix}$ $\begin{array}{c} l=314.6^\circ\\ b=-9.5^\circ \\ d=199.3\,\mathrm{pc} \end{array}$				$\begin{matrix} (93.4 \pm 0.3) \times 10^{3} M_{⊙} \\ in vicinity \end{matrix}$ $\begin{array}{c} (93.4\pm0.3)\times10^{3}\,{M}_{\odot}\\ \mathrm{in~vicinity} \end{array}$

Notes. The specified uncertainties encompass at least two-thirds of the 3D dust map posterior samples. The specified positions capture the core features of the C while including as little as possible from other molecular clouds. The spherical and Cartesian cuts are not equivalent as for each of them we tried to minimize projection and obscuration effects from molecular clouds not affiliated with the C (cf. Figs. 1 and 3).

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