Statistics – Computation
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..331...97g&link_type=abstract
Extra-Planar Gas, ASP Conference Proceedings, Vol. 331. Edited by Robert Braun. Proceedings of the meeting held at Dwingeloo,
Statistics
Computation
Scientific paper
We present computations of the photoionization properties of gas clouds in dark-matter mini-halos. We show results for the densities and projected column densities of various metal ions, created in the neutral cores and in the ionized envelopes of the mini-halo clouds. We compare the ionization properties of the mini-halo models with those of the the high-velocity metal-ion absorbers, observed toward Mrk 509 and PKS 2155-304. We examine the possible relationships between the H I compact high-velocity clouds (CHVCs), dwarf galaxies and high-velocity ionized absorbers. We find that the photoionization states in CHVC-scale models, are much lower than in the metal-ion absorbers. However, in dwarf galaxy-scale models the photoionization states resemble those of the ionized high-velocity absorbers. An important exception is O VI which is under-predicted by the photoionization models, suggesting additional processes are involved.
Gnat Orly
Sternberg Amiel
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