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The Mass of the HII Envelope
We derive a total flux from the extended filaments of
erg cm s. This implies a luminosity of
erg s at the redshift distance of the quasar
(384 Mpc). Assuming complete ionization and employing a geometry in
which the filaments are approximately as deep as they are wide (i.e.,
7 pixels 5 kpc), we calculate an rms filament density of
cm. For a filling
factor , this implies an upper limit on the ionized gas mass of
M, distributed in a volume of
kpc. These estimates are consistent with
previously published values (Nørgaard-Nielsen et al. 1986; Macchetto
et al. 1990).
Patrick Shopbell
2000-11-28