Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galactic Wind Effects on the Lyman-alpha Absorption in the Vicinity of
  Galaxies   We present predictions of Ly-alpha forest-galaxy correlations at z=3 from
Eulerian simulations that include the effects of galactic winds, driven
primarily by supernova explosions. Galactic winds produce expanding bubbles of
shock-heated gas within ~0.5 comoving Mpc/h of luminous galaxies in the
simulation, which have space density similar to that of observed Lyman break
galaxies (LBGs). However, most of the low-density intergalactic gas that
determines the observed properties of the Ly-alpha forest is unaffected by
winds. The impact of winds on the Ly-alpha optical depth near galaxies is less
dramatic than their impact on gas temperature because winds heat only a small
fraction of the gas present in the turnaround regions surrounding galaxies.
Hence, Ly-alpha absorption from gas outside the wind bubbles is spread out over
the same velocity range occupied by the wind-heated gas. In general, Ly-alpha
absorption is expected to be stronger than average near galaxies because of the
high gas density. Winds result in a modest reduction of this expected increase
of Ly-alpha absorption. Our predictions can be compared to future observations
to detect the wind effects and infer their strength, although with the caveat
that the results are still dependent on the correspondence of simulated
galaxies and observed LBGs. We find that wind effects in our simulations are
not strong enough to reproduce the high Ly-alpha transmission within 0.5 Mpc/h
comoving of galaxies that has been suggested by recent observations; powerful
galactic explosions or ejecta with hyper-escape velocities would be required,
but these are unlikely to be produced by ordinary star formation and supernovae
alone

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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom