Signature of Galactic Outflows as Absorption-Free Gaps in the Ly-alpha Forest

Details Signature of Galactic Outflows as Absorption-Free Gaps in the Ly-alpha Forest Signature of Galactic Outflows as Absorption-Free Gaps in the Ly-alpha Forest

2005-05-10

arxiv.org/abs/astro-ph/0505182v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, submitted to ApJL

Scientific paper

Powerful outflows from star-forming galaxies are expected to push away the neutral intergalactic medium (IGM) around those galaxies, and produce absorption-free gaps in the Ly-alpha forest. We analyze the abundance of gaps of various sizes in three high resolution spectra of quasars at z ~ 3 - 3.5. The gap statistics agrees well with a model in which galactic halos above a minimum mass scale of M_min ~ 10^10 M_sun produce bubbles with a characteristic radius of R_b ~ 0.48 Mpc/h. Both numbers are consistent with naive theoretical expectations, where the minimum galaxy mass reflects the threshold for infall of gas out of a photo-ionized IGM. The observed gaps are typically bounded by deep absorption features as expected from the accumulation of swept-up gas on the bubble walls.

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