Giant Ly-alpha nebulae in the high redshift (z>2) Universe

Abstract

High redshift radio galaxies (z>2) are believed to be progenitors of the giant ellipticals of today. They are often associated with giant Ly-alpha nebulae (sometimes >100 kpc), which have been for more than two decades valuable sources of information about the evolutionary status of the host galaxy and its chemical enrichment and star formation histories. I present in this paper a summary of the most relevant results about the giant nebulae obtained in the last ~10 years and the implications on our understanding of the early phases of evolution of massive elliptical galaxies.

arXiv commentPresented at the workshop on The Fate of the Gas in Galaxies, Dwingeloo, The Netherlands, July 2006. To appear in New Astronomy Reviews; 7 pages, 7 figures

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• Lyman Alpha Blobs as an Observational Signature of Cold Accretion Streams into Galaxies
• The large and small scale properties of the intergalactic gas in the Slug Ly-alpha nebula revealed by MUSE HeII emission observations
• The REQUIEM Survey I: A Search for Extended Ly-Alpha Nebular Emission Around 31 z>5.7 Quasars
• The Grism Lens-Amplified Survey from Space (GLASS). XI. Detection of CIV in Multiple Images of $z=6.11$ Ly$\alpha$ Emitter Behind RXCJ2248.7-4431
• Infrared and millimetre-wavelength evidence for cold accretion within a z = 2.83 Lyman-alpha blob
• Spectroscopy of extended Lyα envelopes around z=4.5 quasars
• Lyman Alpha and MgII as Probes of Galaxies and their Environments
• Deep rest-frame far-UV spectroscopy of the giant Lyman-alpha emitter 'Himiko'
• An 80-kpc Lyman-alpha halo around a high redshift type-2 QSO
• A 100 kpc nebula associated with the "Teacup" fading quasar
• Continuum Emission by Cooling Clouds
• The Detection of Intergalactic Halpha Emission from the Slug Nebula at z~2.3
• The disappearance of Lyman alpha blobs: a GALEX search at z=0.8
• A high baryon fraction in massive haloes at z~3
• Mapping the "invisible" circumgalactic medium around a z $\sim$ 4.5 radio galaxy with MUSE
• Deep optical spectroscopy of extended Lyman alpha emission around three radio-quiet z=4.5 quasars
• Search for extended Lyman-$\alpha$ emission around 9k quasars at z=2-3
• Modelling the Evolution of Ly$\alpha$ Blobs and Ly$\alpha$ Emitters