NOAO >   Observing Info >   Approved Programs >   2013A-0104

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Proposal Information for 2013A-0104


PI: Sebastiano Cantalupo, UC Santa Cruz, cantal@ucolick.org
Address: Astronomy and Astrophysics Board of Study, Natural Sciences II, Santa Cruz, CA, 95064, USA

CoI: Joseph F. Hennawi, MPIA, Heidelberg
CoI: Fabrizio Arrigoni Battaia, MPIA, Heidelberg
CoI: Jason X. Prochaska, UC Santa Cruz
CoI: Piero Madau, UC Santa Cruz

Title: Ly-alpha imaging of dark protogalactic clouds and circumgalactic streams using z 2 quasars

Abstract: The ionizing radiation emitted by a luminous quasar can, like a flashlight, illuminate hydrogen in its vicinity, allowing us to directly *image* dense filaments around galaxies and proto-galactic clouds, which are otherwise invisible because of negligible star formation. We propose to conduct deep narrow band Ly-alpha imaging of luminous quasars at z 2 to detect this Ly-a fluorescence from the surrounding intergalactic and circumgalactic (CGM) medium. Our team has made the first definitive detections of this effect, and we have developed radiative transfer simulations in a cosmological setting for direct end-to-end comparison to our proposed observations. This novel technique compliments decades of effort using absorption-line techniques and will provide an ideal target list for future kinematic analysis of the CGM.


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NOAO >   Observing Info >   Approved Programs >   2013A-0104

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