Disruption of a massive molecular cloud by a supernova in the Galactic Centre - Initial results from the ACES project

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Volume 691 (November 2024)

A&A, 691 (2024) A70

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Table 1

Properties of the M0.8–0.2 ring.

Property	Value
Longitude, l (deg)	0.804
Latitude, b (deg)	−0.184
Radius
… r_in/r_out (arcsec)	79/154
… r_in/r_out (pc)	3.1/6.1
… r_in,d = r_in/cos(i) (pc)	4.4
… r_out,d = r_out/cos(i) (pc)	8.7
Systemic velocity, v_sys (km/s)	37.5
Expansion speed (km/s)
… v_exp	15.1
… v_exp,d = v_exp/sin(i) (km/s)	21.3
Age, t_age = r_out/v_exp (Myr)	0.4
Mass (M_⊙)
⁽¹⁾ … M	7.6 × 0⁵
⁽²⁾ … M_d	1.1 × 0⁶
⁽³⁾ …M_f	3.8 × 0⁵
⁽⁴⁾ …M_d,f	5.4 × 10⁵
Kinetic energy (erg)
… $E = \frac{1}{2} M v_{\exp}^{2}$ $\[\E=\frac{1}{2} M v_{\exp }{}^2\]$	1.7 × 10⁵¹
… $E_{d} = \frac{1}{2} M_{d} v_{e x p, d}^{2}$ $\[\E_{\mathrm{d}}=\frac{1}{2} M_{\mathrm{d}} v_{\mathrm{exp}, \mathrm{~d}}{}^2\]$	4.8 × 10⁵¹
… $E_{f} = \frac{1}{2} M_{f} v_{\exp}^{2}$ $\[\E_{\mathrm{f}}=\frac{1}{2} M_{\mathrm{f}} v_{\exp }{}^2\]$	8.5 × 10⁵⁰
… $E_{d, f} = \frac{1}{2} M_{d, f} v_{e x p, d}^{2}$ $\[\E_{\mathrm{d}, \mathrm{f}}=\frac{1}{2} M_{\mathrm{d}, \mathrm{f}} v_{\mathrm{exp}, \mathrm{~d}}{ }^2\]$	2.4 × 10⁵¹
Momentum (M_⊙ km s⁻¹)
… p = Mv_exp	1.1 × 10⁷
… p_d = M_dv_exp,d	2.3 × 10⁷
… p_f = M_fv_exp	5.7 × 10⁷
… p_d,f = M_d,fv_exp,d	1.1 × 10⁷
Magnetic Field, B_POS (mG)	0.22 − 0.57

Notes. We list properties of the M0.8–0.2 ring, obtained in Sects. 3.1, 3.2, and 3.3, as well as the plane-of-sky magnetic field strength measured by Butterfield et al. (2024b). A number of different estimates for the radius, expansion velocity, mass, energy and momentum are provided, assuming different possible three-dimensional geometries (see Sect. 3.3). All ‘deprojected’ values, denoted by subscript d, use an inclination angle of i = 45° (where sin(45°) = cos(45°) = 0.7) to adjust for an inclined geometry. All mass values are calculated assuming a constant density of 10^4.2 cm⁻³, determined from radiative transfer modelling. ⁽¹⁾Mass calculated assuming a complete spherical shell geometry (i.e. a volume of $v_{out} - v_{in} = \frac{4}{3} π (r_{out}^{3} - r_{in}^{3})$ $\[v_{\text {out }}-v_{\text {in }}=\frac{4}{3} \pi\left(r_{\text {out }}^3-r_{\text {in }}^3\right)\]$ ). ⁽²⁾Mass calculated assuming a complete, inclined ellipsoidal shell geometry (i.e. a volume $v_{out} - v_{in} = \frac{4}{3} π (r_{out}^{2} r_{out, d} - r_{in}^{2} r_{in,d})$ $\[v_{\text {out }}-v_{\text {in }}=\frac{4}{3} \pi\left(r_{\text {out }}^2 r_{\text {out }, \mathrm{d}}-r_{\text {in }}^2 r_{\text {in,d }}\right)\]$ ⁽³⁾Mass calculated assuming a partial, spherical shell geometry, with a filling factor, f, of 0.5. ⁽⁴⁾Mass calculated assuming a partial, inclined ellipsoidal shell geometry, with a filling factor, f, of 0.5.

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