Table 2
Structure and physical conditions in the molecular disk in the Red Rectangle derived from our model fitting of the CO data.
| Inner disk (r < Rkep) | Outer disk (r > Rkep) | |||
| Parameter | Law | Values | Law | Values |
|
|
||||
| Outer radius | Rkep = 8.4 × 1015 cm |
Rout = 2.7 × 1016 cm |
||
|
|
||||
| Disk | linear | H(Rkep) = 1.3 × 1016 cm |
constant |  cm |
| thickness | H(0) = 6.5 × 1015 cm |
|||
|
|
||||
| Tangential |
|
Vt(Rkep) = 1.65 km s-1 | Vt ∝ 1/r | Vt(Rkep) = 1.65 km s-1 |
| velocity | (Keplerian) | (central mass: 1.7 M⊙) |
(ang. mom. cons.) | |
|
|
||||
| Expansion | 0 km s-1 |
|
Vexp(Rkep) = 1.6 km s-1 | |
| velocity | Vexp(Rout) = 0 km s-1 | |||
|
|
||||
| Turbulence | constant | σturb = 0.2 km s-1 | constant | σturb = 0.2 km s-1 |
| velocity | ||||
|
|
||||
| Temperature | T ∝ 1/rαT | T(Rkep) = 95 K | T ∝ 1/rαT | T(Rkep) = 150 K |
| αT = 1 | αT = 0.7 | |||
| Gas density | n ∝ 1/rαn | n(Rkep) = 4 × 105 cm-3 |
n ∝ 1/rαn | n(Rkep) = 1105 cm-3 |
| αn = 2.2 | αn = 2.2 | |||
|
|
||||
| Other parameters | Law | Values | Comments | |
|
|
||||
| Axis inclination from the plane of the sky | 5° | from optical and CO data | ||
| Axis inclination in the plane of the sky (PA) | 11° | from optical and CO data | ||
|
|
||||
| Distance | between 380 and 710 pc | various arguments (Sect. 4) | ||
| 12CO relative abundance | constant | 2 × 10-4 | from CO data | |
| 13CO relative abundance | constant | 2 × 10-5 | from CO data | |
| LSR systemic velocity | −0.2 km s-1 | from CO data | ||
Notes. Dependence on the assumed distance to the source is given in the relevant cases, but we favor a distance of 710 pc. We show in bold-face characters the values that change significantly compared to those deduced from the low-J lines only; in practice this is only the gas temperature.
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