H3+ in the Galactic CenterDIffuse warm gas to be the primary entity in CMZ The H3+ is the most fundamental molecular ion in the ISM, that works as if it is a catalizer to push the chemical network to creates ever more complex molecules. The spectra in the left show absorption by the H3+ in the Galactic center. The transition from (J, K)=(1, 1) and (1, 0) are from the rotational ground leves. The presence of R(3,3)l from the metatable state (J, K)=(3,3) and almost complete absence of R(2,2)l manifests the H3+ in the Galactic center is in rotationally non-thermal distribution in the Galactic center, uncovering presence of diffuse (nH<100cm3) and warm (T>250K) clouds there. The size of the clouds measures 10-100 pc in the depth, which makes the H3+ clouds the primary volumn contributer inside the central molecular zone (CMZ). |
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