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Table 3

Observed characteristics of the compact sources.

Parameters H2 source H ii source

Size 05 04
ec  ~20  −
ne [cm-3  − 58a
Mass [M] 1.3    ×    107b 4.8    ×    104c
Nion [phot. s-1]  <2.6  ×  1049d 8.5  ×  1050e
Lbol [L] 2.6  ×  106f 5  ×  107g



Assuming ionization balance, and not correcting for extinction, scales as ;


virial mass estimated from the intrinsic S(1) size and the CO line width;


mass of the H ii gas uncorrected for extinction, scales as ;


from the upper limit of the Brγ emission, uncorrected for extinction;


derived from the Brγ luminosity, scales as ec;


H2 bolometric luminosity corrected for extinction (Sect.  3.3);


from the age and Nion. Uncorrected for extinction, scales as ec.

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