Evidence of Cold Accretion in a z=2.4 Lya Nebula

Details Evidence of Cold Accretion in a z=2.4 Lya Nebula Evidence of Cold Accretion in a z=2.4 Lya Nebula

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460312s&link_type=abstract

American Astronomical Society, AAS Meeting #214, #603.12

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Scientific paper

I will present a study of an extended Lyman-alpha (Lya) nebula located in a known overdensity at z=2.38. Two galaxies are associated with the Lya blob. One of them is a dust enshrouded AGN, while the other is a powerful starburst. We detect the HeII (1640A) emission line in the spectrum of the obscured AGN, but detect no emission from other highly ionized metals (CIV or NV) as is expected from and AGN. One scenario that simultaneously reproduces the width of the detected emission lines, the lack of CIV emission, and the geometry of the emitting gas, is that the HeII and the Lya emission are the result of cooling gas that is being accreted on the dark matter halo of the two galaxies.

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