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 OSIRIS-LGS is scheduled with UH observers. Keck 2 NIRSPEC is scheduled for UCSD/UCD observers. Sun set 06:47:00pm rise 05:57:00am
We are setting up LRIS-ADC on Keck 1 for NASA/KECK observers, DEIMOS on Keck 2 for UCD observers. Sun set 06:48:00pm rise 05:56:00am
Happy Sunday! One of the clever scientists posted this as the description for their observing run here at Keck. pic.twitter.com/3iSlETZTFr
CIT observers will work with LRIS-ADC tonight. And UCI observers will work with DEIMOS. Sun set 06:49:00pm rise 05:56:00am
Observers from CIT will use LRIS-ADC on Keck 1, while on Keck 2, UCI observers will use DEIMOS. Sun set 06:50:00pm rise 05:56:00am