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Gas Accretion and Angular Momentum

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Book cover Gas Accretion onto Galaxies

Part of the book series: Astrophysics and Space Science Library ((ASSL,volume 430))

Abstract

In this chapter, we review the role of gas accretion to the acquisition of angular momentum, both in galaxies and in their gaseous halos. We begin by discussing angular momentum in dark matter halos, with a brief review of tidal torque theory and the importance of mergers, followed by a discussion of the canonical picture of galaxy formation within this framework, where halo gas is presumed to shock-eat to the virial temperature of the halo, following the same spin distribution as the dark matter halo before cooling to the center of the halo to form a galaxy there. In the context of recent observational evidence demonstrating the presence of high angular momentum gas in galaxy halos, we review recent cosmological hydrodynamic simulations that have begun to emphasize the role of “cold flow” accretion—anisotropic gas accretion along cosmic filaments that does not shock-heat before sinking to the central galaxy. We discuss the implications of these simulations, reviewing a number of recent developments in the literature, and suggest a revision to the canonical model as it relates to the expected angular momentum content of gaseous halos around galaxies.

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Notes

  1. 1.

    The revised spin parameter from Bullock et al. (2001) was first introduced as λ , but for the purposes of our discussions in this chapter, we will drop the prime and adopt this revised spin parameter as simply λ.

  2. 2.

    Since Zjupa and Springel (2016) do not provide fitting parameters to the modified λ from Bullock et al. (2001), we compare here with their SO–halo log-normal fit to λ P from Peebles (1969), given in Eq. (1), which appears qualitatively similar to their results for the Bullock definition, based on their Fig. 9.

  3. 3.

    Insofar as the angular momentum of spheroids at low redshift are still thought to be most strongly correlated with the merger history of its dark matter halo, we note that the following discussion mostly pertains to the newfound importance of filamentary cold accretion to the growth of massive disk-dominated galaxies, or to the properties of gaseous halos of galaxies.

  4. 4.

    In detail, a minimum 3D hydrogen density cutoff of n H > 3 × 10−3 cm−3 was implemented, however, this should correspond to a minimum hydrogen column density of \(N_{\mathrm{HI}}\gtrsim 10^{17}\) cm−2 (e.g., Altay et al. 2011; Schaye 2001)

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Acknowledgements

KRS thanks Ari Maller for providing useful comments and discussions.

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Correspondence to Kyle R. Stewart .

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© 2017 Springer International Publishing AG

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Stewart, K.R. (2017). Gas Accretion and Angular Momentum. In: Fox, A., Davé, R. (eds) Gas Accretion onto Galaxies . Astrophysics and Space Science Library, vol 430. Springer, Cham. https://doi.org/10.1007/978-3-319-52512-9_11

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