Аннотация
We investigate the association between galaxies and metal-line and metal-free
absorbers in the local universe ($z < 0.16$) using a large compilation of FUV
spectra of bright AGN targets observed with the Cosmic Origins Spectrograph
aboard the Hubble Space Telescope. In this homogeneous sample of 24 O VI
detections ($Z 0.1\,Z_ødot$) and 25 non-detections, the maximum
distance O VI extends from galaxies of various luminosities is $\sim0.6$ Mpc,
or $\sim5\,R_vir$, confirming and refining earlier results. This is an
important value that must be matched by numerical simulations, which input the
strength of galactic winds at the sub-grid level. We present evidence that the
primary contributors to the spread of metals into the circum- and intergalactic
media are $L<L^*$ galaxies. The maximum distances that metals are transported
from these galaxies is comparable to the size of a small, spiral-rich group of
galaxies. This suggests that, while rather pristine intergalactic material may
accrete onto these groups where it can mix with metal-bearing clouds, the
metals produced by the group galaxies may not leave the group, creating a
nearly "closed box" for galactic evolution.
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