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Gas Accretion and Star-Formation Rates with IFUs and Background Quasars

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Gas Accretion onto Galaxies

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

Abstract

Star forming galaxies (SFGs) are forming stars at a regular pace, forming the so-called main sequence (MS). However, all studies of their gas content show that their gas reservoir ought to be depleted in 0.5–2 Gyr. Thus, SFGs are thought to be fed by the continuous accretion of intergalactic gas in order to sustain their star-formation activity. However, direct observational evidence for this accretion phenomenon has been elusive. Theoretically, the accreted gas coming from the intergalactic medium is expected to orbit about the halo, delivering not just fuel for star-formation but also angular momentum to the galaxy. This accreting material is thus expected to form a gaseous structure that should be co-rotating with the host once at r < 0. 3 R vir or r < 10–30 kpc. Because of the rough alignment between the star-forming disk and this extended gaseous structure, the accreting material can be most easily detected with the combination of background quasars and integral field units (IFUs). In this chapter, accretion studies using this technique are reviewed.

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Notes

  1. 1.

    α is defined as the angle between the galaxy major-axis and the apparent quasar location.

  2. 2.

    This system is also a damped Lyman absorber (DLA; Lopez et al. 2002) with a column density of logN HI  = 20. 6.

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Correspondence to Nicolas F. Bouché .

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Bouché, N.F. (2017). Gas Accretion and Star-Formation Rates with IFUs and Background Quasars. 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_15

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