Astronomy Colloquium for 2017-11-01

Series: Astronomy Colloquium
Date: Wednesday 01-Nov-2017
Time: 16:05-17:00 (4:05-5:00 pm)
Location: ATL 2400
Speaker: Dr. Jackie Hewitt (MIT)
Title: Probing the Cosmic Dawn and the Epoch of Reionization with the 21cm Hydrogen Line

Measurements of the cosmic microwave background at redshift 1100 give us information about the initial density fluctuations that seeded structure formation. Observations of galaxies at redshift 7 give us information about the outcome of this structure formation. Between those redshifts lies a modern frontier of cosmology -- the cosmic dawn -- the formation of the first stars and the reionization of the intergalactic medium. Several recently completed low frequency radio arrays have provided us with an early glimpse into the Epoch of Rionization through the redshifted neutral hydrogen 21cm radio line. A new instrument, the Hydrogen Epoch of Reionization Array (HERA) is under construction. HERA will be significantly more capable, and presents interesting opportunities and challenges.

Colloquia are usually preceded by espresso and ice cream at 1:45 pm outside room PSC 1150 and are followed by an informal reception at 5:15 pm in that room. Anyone interested in talking with the speaker, or being added to the colloquium announcement email list, should contact the colloquium organizer. Lunch will normally be reserved for the speaker to talk to graduate students.

Colloquium Organizer: Prof. L. Drake Deming


Special accommodations for individuals with disabilities can be made by calling (301) 405-3001. It would be appreciated if we are notified at least one week in advance.


Directions and information about parking can be found here.

This page was automatically generated on: 16-Oct-2017.