How Stars Destroyed Almost All the Atoms in the Universe – Dr. Brian Siana

On Thursday, May 10, 2012, Keck Observatory hosted a live webcast of an astronomy talk by Dr. Brian Siana of the University of California at Riverside. Below is the recording of that talk, which was delivered to a live audience at the Kahilu Theatre in Kamuela-Waimea, Hawaii.

The first galaxies had an extraordinary impact on the young universe. Their ultraviolet light destroyed nearly all of the atoms in the cosmos. This process, called reionization, had severe consequences for galaxies trying to form thereafter. Unfortunately, we have no idea how it happened. In galaxies today ultraviolet light cannot escape, so the first galaxies must have been very different from those we see today. Dr. Siana will describe the quest to detect these first galaxies and their impact on the early universe.

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Keck 1 HIRESR is scheduled with NASA observers. Keck 2 NIRC2-LGS is scheduled for NASA observers. Sun set 07:11:00pm rise 05:46:00am
We are setting up HIRESR on Keck 1 for NASA observers, DEIMOS on Keck 2 for UH observers. Sun set 07:12:00pm rise 05:45:00am
NASA observers will work with HIRESR tonight. And UH observers will work with DEIMOS. Sun set 07:12:00pm rise 05:45:00am
Observers from NASA will use HIRESR on Keck 1, while on Keck 2, UH observers will use ESI. Sun set 07:13:00pm rise 05:44:00am
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