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Cited by 1,080

The DOI matches its Crossref record; 22 of the 22 references it cites were found in a registry or an index.

Virial shocks in galactic haloes?

Open access
Birnboim, Yuval, Dekel, Avishai·2003·Monthly Notices of the Royal Astronomical Society
DOI 10.1046/j.1365-8711.2003.06955.x
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Abstract

We investigate the conditions for the existence of an expanding virial shock in the gas falling within a spherical dark matter halo. The shock relies on pressure support by the shock-heated gas behind it. When the radiative cooling is efficient compared with the infall rate, the post-shock gas becomes unstable; it collapses inwards and cannot support the shock. We find for a monatomic gas that the shock is stable when the post-shock pressure and density obey . When expressed in terms of the pre-shock gas properties at radius r it reads as ρrΛ(T)/u3 < 0.0126, where ρ is the gas density, u is the infall velocity and Λ(T) is the cooling function, with the post-shock temperature T∝u2. This result is confirmed by hydrodynamical simulations, using an accurate spheri-symmetric Lagrangian code. When the stability analysis is applied in cosmology, we find that a virial shock does not develop in most haloes that form before z∼ 2, and it never forms in haloes less massive than a few 1011 M⊙. In such haloes, the infalling gas is not heated to the virial temperature until it hits the disc, thus avoiding the cooling-dominated quasi-static contraction phase. The direct collapse of the cold gas into the disc should have non-trivial effects on the star formation rate and on outflows. The soft X-ray produced by the shock-heated gas in the disc is expected to ionize the dense disc environment, and the subsequent recombination would result in a high flux of Lα emission. This may explain both the puzzling low flux of soft X-ray background and the Lα emitters observed at high redshift.

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Metadata

Authors
Birnboim, Y., & Dekel, A.
Venue
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Published
2003-10
Volume
345
Issue
1
Pages
349-364
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
DOI
10.1046/j.1365-8711.2003.06955.x
OpenAlex
W2122910569
Cited by
1,080
References
22
FWCI
14.30
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Virial shocks in galactic haloes? https://app.cochat.ai/papers/10.1046/j.1365-8711.2003.06955.x
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Birnboim, Y., & Dekel, A. (2003). Virial shocks in galactic haloes? Monthly Notices of the Royal Astronomical Society. https://doi.org/10.1046/j.1365-8711.2003.06955.x

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