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dc.contributor.author
Cantalupo, Sebastiano
dc.date.accessioned
2020-07-13T09:00:09Z
dc.date.available
2017-06-12T17:58:46Z
dc.date.available
2020-05-11T12:58:03Z
dc.date.available
2020-07-13T09:00:09Z
dc.date.issued
2016-12-01
dc.identifier.uri
http://hdl.handle.net/20.500.11850/125119
dc.description.abstract
Several decades of observations and discoveries have shown that high-redshift AGN and massive galaxies are often surrounded by giant Lyman-alpha nebulae extending in some cases up to 500 kpc in size. In this review, I discuss the properties of the such nebulae discovered at z>2 and their connection with gas flows in and around the galaxies and their halos. In particular, I show how current observations are used to constrain the physical properties and origin of the emitting gas in terms of the Lyman-alpha photon production processes and kinematical signatures. These studies suggest that recombination radiation is the most viable scenario to explain the observed Lyman-alpha luminosities and Surface Brightness for the large majority of the nebulae and imply that a significant amount of dense, ionized and cold clumps should be present within and around the halos of massive galaxies. Spectroscopic studies suggest that, among the giant Lyman-alpha nebulae, the one associated with radio-loud AGN should have kinematics dominated by strong, ionized outflows within at least the inner 30-50 kpc. Radio-quiet nebulae instead present more quiescent kinematics compatible with stationary situation and, in some cases, suggestive of rotating structures. However, definitive evidences for accretion onto galaxies of the gas associated with the giant Lyman-alpha emission are not unambiguously detected yet. Deep surveys currently ongoing using other bright, non-resonant lines such as Hydrogen H-alpha and HeII1640 will be crucial to search for clearer signatures of cosmological gas accretion onto galaxies and AGN.
en_US
dc.language.iso
en
en_US
dc.publisher
Cornell University
en_US
dc.title
Gas Accretion and Giant Lyman-alpha Nebulae
en_US
dc.type
Working Paper
ethz.journal.title
arXiv
ethz.pages.start
1612.00491
en_US
ethz.size
26 p.
en_US
ethz.grant
From Cosmic Web to Galaxies: Illuminating the Gaseous Link between the Dark and the Bright Universe
en_US
ethz.identifier.arxiv
1612.00491
ethz.publication.place
Ithaca, NY
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::09592 - Cantalupo, Sebastiano (ehemalig) / Cantalupo, Sebastiano (former)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::09592 - Cantalupo, Sebastiano (ehemalig) / Cantalupo, Sebastiano (former)
ethz.grant.agreementno
163824
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
SNF-Förderungsprofessuren Stufe 2
ethz.date.deposited
2017-06-12T17:59:30Z
ethz.source
ECIT
ethz.identifier.importid
imp5936550a8316d25226
ethz.ecitpid
pub:187690
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2017-07-14T16:34:35Z
ethz.rosetta.lastUpdated
2022-03-29T02:38:28Z
ethz.rosetta.versionExported
true
ethz.COinS
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