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Table 4

H2 column densities for a dust temperature of 150 K.

Source NH2 (1024 cm-2)
ALMAa ALMAdustb SMA(1.6″)c SMA(0.3″)d
N1 15.4(2.2) 13.1(2.2) 8.1(0.9) _ *
N2 3.6(0.2) 1.6(0.5) 1.7(0.2) 5.1(0.4)
N3 <0.36(0.16) <0.36(0.16) <0.21(0.01) <0.5
N4 0.47(0.05) 0.47(0.05) <0.55(0.02) <1.0
N5 1.21(0.21) 0.80(0.17) <1.26(0.02) <2.1

Notes. The uncertainties are given in parentheses and correspond to the standard deviations weighted by the error on and on the correction factor for the free-free emission. .

(a)

H2 column densities calculated based on the ALMA data after correction for the primary beam attenuation, for a mean synthesized beam size of ~1.6″.

(b)

ALMAdust is in addition corrected for the free-free contribution.

(c)

H2 column densities calculated based on the SMA map smoothed to the ALMA resolution (~1.6″).

(d)

H2 column densities calculated based on the SMA map at its original resolution (~0.3″)

(*)

The dust emission toward Sgr B2(N1) being optically thick we cannot derive its H2 column density.

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