Table 1
Physical properties of four hot cores embedded in Sgr B2(N).
| Hot | R(a) |  |
Mg (R)(c) |  |
 |
 |
 |
 |
 |
 |
 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| core | (103 au) | (1024cm−2) | (M⊙) | (103 au) | (K) | (10−19g cm−3) | (107 cm−3) | (105 L⊙) | (105 yr) | (M⊙) | (106 au) |
| N2 | 8.01 (0.50) | 1.42 (0.39) | 151 (42) | 6.01 (1.50) | 150 ( ) |
3.20 (1.53) | 1.37 (0.65) | 2.63 ( ) |
2.10 ( ) |
42 ( ) |
1.65 (0.67) |
| N3(⋆) | 2.00 (1.25) | 0.90 (0.17) | 6 (1) | 2.00 (0.50) | 150 ( |
5.27 (2.96) | 2.25 (1.26) | 0.45 ( ) |
0.20 ( ) |
18 ( ) |
0.77 (0.55) |
| N4 | 8.01 (0.50) | 0.41 (0.04) | 43 (4) | 5.01 (1.50) | 150 ( |
1.21 (0.57) | 0.52 (0.24) | 3.92 ( ) |
3.06 ( ) |
51 ( ) |
0.72 (0.52) |
| N5 | 8.01 (0.50) | 0.71 (0.16) | 72 (17) | 5.01 (2.00) | 150 ( |
2.09 (1.31) | 0.89(0.56) | 2.82 ( ) |
2.25 ( ) |
44 ( ) |
1.04 (0.78) |
Notes. The uncertainties are given in parentheses. (a)Radius of the mean synthesized beam of the ALMA data (Eq. (6)). (b) Average peak H2 column density for a mean synthesized beam radius R (Eq. (3)). The uncertainty corresponds to the standard deviation weighted by the error on the ALMA peak flux density, 
, and on the correction factor for the free-free emission (Bonfand et al. 2017). (c) Gas mass of the envelope contained in R (Eq. (5)). (d) Radius of the COM emission region (Sect. 3.2). (e)Excitation temperature derived from population diagrams (Sect. 3.2). (f) Dust mass density at the radius r0 assuming a standard gas-to-dust mass ratio of 100 (Eq. (10)). (g) Density of total hydrogen (nH = n(H)+2n(H2)) at r = r0 (Eq. (15)). (h)Estimated current luminosity of the source (Sect. 3.3). (i) Age of the source estimated from its current luminosity (Sect. 3.4, Fig. 2c). (j) Mass of the protostar derived from its current luminosity (Sect. 3.4, Fig. F.3). (k) Initial radius of the envelope of the source (Sect. 3.5.2). (⋆)In the case of Sgr B2(N3), which is not detected in the EMoCA continuum data at 3 mm, we used the peak flux density reported by Sánchez-Monge et al. (2017), measured at 1.3 mm in an ALMA synthesized beam of 0.4′′ (that is R = 2003 au), to derive the H2 column density and mass.
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