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Ly�� blobs as an observational signature of cold accretion streams into galaxies
Open accessAbstract
Recent hydrodynamic simulations of galaxy formation reveal streams of cold (T∼ 104 K) gas flowing into the centres of dark matter haloes as massive as 1012−13.5 M⊙ at redshifts z∼ 1–3. In this paper, we show that if ≳20 per cent of the gravitational binding energy of the gas is radiated away then the simulated cold flows are spatially extended Lyα sources with luminosities, Lyα linewidths and number densities that are comparable to those of observed Lyα blobs. Furthermore, the filamentary structure of the cold flows can explain the wide range of observed Lyα blob morphologies. Since the most massive haloes form in dense environments, the association of Lyα blobs with overdense regions arise naturally. We argue that Lyα blobs – even those which are clearly associated with starburst galaxies or quasars – provide direct observational support for the cold accretion mode of galaxies. We discuss various testable predictions of this association.
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Citations
Cites
A Universal Density Profile from Hierarchical Clustering
Navarro, J. F., Frenk, C. S., & White, S. D. M. (1997) · The Astrophysical Journal · doi:10.1086/304888 · Cited by 9,917
Cited by
Steidel, C. C., Erb, D. K., Shapley, A. E., Pettini, M., Reddy, N., Bogosavljević, M., Rudie, G. C., & Rakic, O. (2010) · The Astrophysical Journal · doi:10.1088/0004-637x/717/1/289 · Cited by 1,042
Early galaxy formation and its large-scale effects
Dayal, P., & Ferrara, A. (2018) · Physics Reports · doi:10.1016/j.physrep.2018.10.002 · Cited by 403
Absorption-line systems in simulated galaxies fed by cold streams: ALSs in simulated galaxies
Fumagalli, M., Prochaska, J. X., Kasen, D., Dekel, A., Ceverino, D., & Primack, J. R. (2011) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2011.19599.x · Cited by 298
Metadata
- Authors
- Dijkstra, M., & Loeb, A.
- Venue
- Monthly Notices of the Royal Astronomical Society
- Publisher
- Oxford University Press (OUP)
- Published
- 2009-12-01
- Volume
- 400
- Issue
- 2
- Pages
- 1109-1120
- ISSN
- 0035-8711 (ISSN-L)
- 1365-2966
- OpenAlex
- W2115601889
- Cited by
- 188
- References
- 1
- FWCI
- 8.22
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Dijkstra, M., & Loeb, A. (2009). Ly�� blobs as an observational signature of cold accretion streams into galaxies. Monthly Notices of the Royal Astronomical Society. https://doi.org/10.1111/j.1365-2966.2009.15533.x
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