ACS Observations of the Galaxies in A Giant Ly-alpha Nebula at z~2.7

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Hst Proposal Id #10591 Galaxies

Scientific paper

Giant Ly-alpha nebulae appear to be sites of ongoing massive galaxy formation, as evidenced by their association with very luminous, young, star-forming galaxies and large galaxy overdensities. However the origin of the extended gas and the source of ionization remain mysterious. We have discovered a 200 kpc size nebula which appears to contain a number of embedded sources, including a very obscured, luminous mid-infrared source and a Lyman break galaxy. We propose to obtain deep ACS and NICMOS images of this nebula in order to: {i} determine the spatial morphology of the Ly-alpha emission on sub-kpc scales; {ii} precisely locate the known continuum sources within the nebula; {ii} determine their morphologies; {iii} detect the source of ionizing photons at the very center of the nebula; {iv} constrain the ionizing luminosity contributed by a possible distributed population of faint, compact continuum sources in the nebula; and {v} by SED fitting of population synthesis models, constrain the ages of the ionizing sources with the aim of determining the timescale of the galaxy formation process in the nebula.

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