The following document lists the file abstract/RGUESTEN_GUEST_03.abs
from catalogue VI/111.
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The linear filaments of the Galactic center radio arch are believed to be highly ordered and strong magnetic field lines ( milliGauss) illuminated by the collision with a molecular cloud. A prominent ionized region (G0.18-0.4) delineates the cloud/filament interface, perhaps evidence an extremely strong shock. We propose to observe a number of shock/photoionization diagnostics (including Fe_II, H2, Si_II) toward G0.18-0.04 in order to: (1) determine whether the ionized interface is indeed the result of extreme shock activity or is instead enhanced by some nearby photoionizing (e.g. stellar) source or cluster, (2) better understand the interaction that is occurring between the cloud and the filament, (3) better determine the role that the collision process has in the illuminating the magnetic field lines (both precisely how and to what degree) and, (4) better determine the nature of the remarkable magnetic filaments themselves --- an aspect yet poorly understood. Nearly all of the proposed transitions can only be observed effectively from above the atmosphere.