Project area/S
- Physics of the Diffuse Universe and The Evolving Universe
Project Details
It is now well established that star-forming galaxies follow a well-defined relation in the star formation rate (SFR) vs. stellar mass plane, referred to as star-forming main sequence (SFMS). Put simply, bigger galaxies form more stars per year.
All this does sound reasonable but, when we look at this relation in the details, things start looking less “obvious”. The scatter in the relation is not the same across all masses. Instead, it is very high at low and high stellar masses, while reaching a minimum value at masses typical of the mass of the Milky Way.
Why is that?
Many works suggest that this is due to two different physical processes: short burst of star formation at low masses, and the onset of feedback from supermassive black-holes at high masses. But, is it really the case?
In this project, the student will develop a simple analytical model to investigate the potential origin for the dependence of scatter on stellar mass. Specifically, they will determine whether “exotic” scenarios like bursts and/or black-holes are really needed, or if what we are seeing is just a more simple consequence of the secular star formation history of galaxies. Sometimes, we might be overlooking the most simple explanation for complex problems.
Student Attributes
Academic Background
Basic knowledge of astronomy.
Computing Skills
Basic python knowledge (e.g., ability to read and write files and to make basic plots).
Training Requirement
Ability to handle astronomical data and to understand basics of astronomy observational techniques.
Project Timeline
Week 1 | Inductions and project introduction |
Week 2 | Initial presentation and planning of SPIRIT 6 observations |
Week 3 | Developing a model for the evolution of galaxies in the SFR-mass plane |
Week 4 | Calibrate the model to reproduce the relationship between stellar mass and baryonic mass in galaxies |
Week 5 | Add the role of stochasticity |
Week 6 | Investigate the ability of the model to reproduce the observed change of scatter in the main sequence as a function of mass |
Week 7 | Investigate the ability of the model to reproduce the observed change of scatter in the main sequence as a function of mass |
Week 8 | Investigate the ability of the model to reproduce the observed change of scatter in the main sequence as a function of mass |
Week 9 | Final presentation |
Week 10 | Final report |