Next: 2. Dynamics of dwarf Up: 5. Nearby galaxies Previous: 5. Nearby galaxies
Israel, collaborating with Bolatto, Jackson (both Boston Univ.), Zhang (SAO) and Kim (Univ. of Illinois), mapped the actively star-forming regions N159 and N160 in the LMC in J=1-0 13CO, J=2-1 and J=4-3 12CO and in Co. They found that previously mapped major CO cloud complexes are immersed in a large envelope of extended, low-level emission. This emission is optically thin in 12CO, and relatively bright in both Co and C+. The distribution of neutral carbon peaks on a quiescent dense cloud in the complex, while in the more evolved northern region N160 Co is anticorrelated with C+. Over the whole complex, they find that C+ is enhanced with respect to similar complexes in the Milky Way, whereas Co is similar or reduced in emission. A possible explanation for this difference is relatively rapid ionization of Coproduced by CO photodissociation.