Astronomy Colloquium for 2017-09-06

Series: Astronomy Colloquium
Date: Wednesday 06-Sep-2017
Time: 16:05-17:00 (4:05-5:00 pm)
Location: ATL 2400
Speaker: Dr. Megan Johnson (U.S. Naval Observatory)
Title: The HI Neighborhoods Around STARBIRDS

Starbursts are finite periods of intense star formation (SF) that can dramatically impact the evolutionary state of a galaxy. Recently, published results have redefined both the duration and spatial extent of starbursts in dwarf galaxies to be longer and more distributed than previously thought, with star formation efficiencies (SFEs) comparable to spiral galaxies. The contrast between these SFEs and those typical of non-bursting dwarfs highlights the inconsistencies between two SF modes that can operate in low-mass galaxies. These inconsistencies might be explainable if the starburst mode of SF is externally triggered by gravitational interactions with other nearby systems. We present new, sensitive neutral hydrogen observations of 18 starburst dwarf galaxies, which are part of the STARburst IRregular Dwarf Survey (STARBIRDS) and each were mapped with the Green Bank Telescope (GBT) and/or Parkes Telescope in order to study the low surface brightness gas distributions, a common tracer for tidal interactions.

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: 29-Aug-2017.