Table 4
Parameters of the sources embedded in the Main core.
| Offset(a) | Tex (b) | R(c) | Mgas (d) |  (e) |
 (e) |
Σ (f) | |||
|---|---|---|---|---|---|---|---|---|---|
| Source | (arcsec) | (K) | (au) | (M⊙) | (1025 cm−2) | (109 cm−3) | (g cm−2) | τ3.5mm (g) | τ1.4mm (g) |
| A | 0.22 | 500 | 414 | 16 ± 3 | 5.8 ± 1.0 | 7.0 ± 1.2 | 270 ± 45 | 0.5 | 2.7 |
| B | 0.04 | 500 | 390 | 15 ± 3 | 5.9 ± 1.0 | 7.6 ± 1.3 | 276 ± 46 | 0.6 | 2.8 |
| C | 0.30 | 390 | 535 | 26 ± 5 | 5.5 ± 1.1 | 5.2 ± 1.1 | 257 ± 53 | 0.5 | 2.6 |
| D | 0.62 | 225 | 456 | 26 ± 8 | 7.5 ± 2.3 | 8.2 ± 2.5 | 349 ± 108 | 0.7 | 3.5 |
Notes. Estimated from the 3.5 mm emission. (a)Distance to the phase reference center of theobservations of B18, α(J2000) = 18h 47m 34. s 315, δ(J 2000) = −01° 12′ 45.′′ 90, which is the central position of the temperature profile (see Sect. 3.2.2). (b) Methyl formate excitation temperature, estimated following Eq. (1) of B18 (see Sect. 3.2.2). (c) Radius of the source obtained by fitting elliptical 2D Gaussians (Table 2). (d) Mass estimated using a dust opacity of 0.2 cm2 g−1 at 3.5 mm and a dust temperature equal to the CH3OCHO excitation temperature (see Sect. 3.2.2). (e)Column density and number density estimated from Mgas, assuming μH = 2.8. (f) Source mass surface density derived as Σ = Mgas∕π R2, where R is the radius of the source. (g)Dust opacity depth estimated as 
, where κν is the dust opacity, and 100 is the gas-to-dust mass ratio.
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