Jump To Date
View By Semester
View By Series
Add An Event


Center for Astrophysics Research and Technologies Seminar Series Information

 

Events Calendar

Molecular Tracers of Star Formation Feedback in Nearby Galaxies

Thursday September 14, 2017
2:00 pm


 Presenter:  Mark Gorski (UNM/NRAO)
 Series:  Center for Astrophysics Research and Technologies Seminar Series
 Abstract:  The energy and momentum injected into the ISM from stars has a drastic effect on the star formation history of a galaxy. This feedback is responsible for the inefficient collapse of the ISM into stars. By using molecular tracers of feedback, we provide insights into the star forming ecosystem of the galaxies NGC 253, IC 342, NGC 6946, and NGC 2146. We have selected the metastable NH_3 lines as a temperature tracer of the dense molecular ISM, the 22 GHz H_2O maser as an indicator of star formation, and the 36 GHz CH_3OH maser which was previously unexplored in the extragalactic context. We uncover evidence for a uniform two-temperature component distribution of the molecular gas across the central kiloparsec of NGC 253 and IC 342. The temperature does not appear to correlate with feedback effects such as supernovae, PDRs, or shocks. We identify several new water masers associated with star formation across all four galaxies. We also show that extragalactic 36 GHz CH_3OH masers are likely related to large scale weak shocks in the dense molecular ISM. In NGC 253 specifically we test models of galactic outfows driven by a nuclear starburst with sub-arcsecond observations of NH_3(3,3) masers, H_2O masers and CH_3OH masers. We uncover evidence for star formation and entrainment of molecular material in the outflow of NGC 253. 
 Host:  Richard Rand
 Location:  Room 190, Physics & Astronomy

Disability Notice Individuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact Sandra Ortiz (phone: 505-277-5900, email: sportiz@unm.edu) well in advance to ensure your needs are accommodated. Event handouts can be provided in alternative accessible formats upon request. Please contact Ms. Ortiz if you need written information in an alternative format.