Table 1
Geometrical parameters of the different structural components in our representation of the interstellar gas.
| Component | Shape | Dimensions [pc]a | Volume [pc3] | Position [pc]b |
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| Central cavity (CC) | ellipsoid | lx × ly × lz = 2.9 × 2.9 × 2.1 | 9.2 | centered on Sgr A∗ |
| Extended component | 8.4 | |||
| Minispiral | l = 9.7 and d = 0.1 | 0.076 | ||
| Neutral streamers | l = 6.2 and d = 0.3 | 0.44 | ||
| Central sphere | d = 0.8 | 0.27 | ||
|
|
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| Circumnuclear ring (CNR) | trapezoidal ring | rin = 1.2, rout = 3.0 and hin = 0.4, hout = 1.0 | 18 | centered on Sgr A∗ |
| Main molecular ring | rin = 1.2, rout = 3.0 | 18 | ||
| Photo-dissociated inner layer | rin = 1.2, rout,a = 1.6 | 1.65 | ||
|
|
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| Sgr A East SNR | ellipsoid | Lx × Ly × Lz = 9.0 × 9.0 × 6.7 | 285 | (xc,yc,zc) = (−2.0,1.2, −1.5) |
| Extended component | 260 | |||
|
|
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| Radio halo | sphere | d = 18 | 3 050 | (xc,yc,zc) = (−2.0,1.2, −1.5) |
| Extended component | 2 440 | |||
|
|
||||
| Belt of molecular cloudsc,d | ||||
| M−0.13−0.08 (SC) | ellipsoid | ℓx × ℓy′ × ℓz′ = 7.5 × 15 × 7.5 | 442 | (xSC,ySC,zSC) = (4 − 12, − 11, − 5) |
| M−0.02−0.07 (EC) | indented sphere | d = 9 | 356 | (xEC,yEC,zEC) = ( − 3,7, − 4.5) |
| Preshock core | 305 | |||
| Swept-up shell | Δr = 1.5 | 51 | along NE bdy of SNR | |
| Molecular ridge (MR) | 79–98 | |||
| Swept-up shell | Δr = 1.5 | 51 | along NE bdy of SNR | |
| Bridge | curved cylinder | l = (9−15) and d = 2 | 28–47 | between EC and SC |
| Southern streamer (SS) | curved cylinder | l = (7−14) and d = 2 | 22–44 | between SC and CNR |
| Western streamer (WS) | curved cylinder | l = 8 and d = 1 | 6 | along W bdy of SNR |
| Northern ridge (NR) | curved cylinder | l = 4 and d = 1 | 3 | along N bdy of SNR |
Notes.
The errors in our adopted dimensions, which arise from observational uncertainties and from our geometrical approximations, are estimated as follows [in pc]: central cavity: δly ≈ δlz ≈ 0.5. Minispiral: δl ≈ 4, 
. Neutral streamers: δl ≈ 3, δd ≈ 0.15. Central sphere: δd ≈ 0.4. CNR: δrin ≈ 0.4, 
, δhin ≈ 0.2, δhout ≈ 0.5. Sgr A East: δLy ≈ δLz ≈ 1.5. Radio halo: δd ≈ 5. M − 0.13 − 0.08: δℓy′ ≈ δℓz′ ≈ 3. M − 0.02 − 0.07: δd ≈ 3. Swept-up shell: δΔr ≈ 0.7. Bridge and southern streamer: δd ≈ 1. Western streamer and northern ridge: δl ≈ 2, δd ≈ 0.5.
The errors in our adopted positions are estimated as follows [in pc]: ≈ 0.1 for the central cavity; ≈ 0.3 for the CNR and Sgr A East; ~ 2 for the radio halo and the different molecular clouds in the belt.
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