Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going...
Transcript of Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going...
![Page 1: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/1.jpg)
Be nice to satellites, they’re going through a tough phaseRhys PoultonSupervisors: Aaron Robotham and Chris PowerCo-Supervisor: Pascal Elahi
![Page 2: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/2.jpg)
2017 Mock Perth - ICRAR/ UWA
Background• Quenching -> slowing of SFR
• Larger galaxies tend to just self • quench
• Satellites galaxies self quenched less
• Satellites galaxies are quenched by their environment • Ram pressure stripping - IGM strips ISM • Smaller satellites are quenched over very
long timescales
• When run in state-of-the-art hydrodynamical simulations they tend to be: • Too gas poor • Excessively quenched
2
Wetzel et al. 2013
Wheeler et at 2014
![Page 3: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/3.jpg)
2017 Mock Perth - ICRAR/ UWA
Whats the big idea?
• Use the parameters of the orbits of satellites to see if it can reveal if they are quenched
• Then feed this information into Semi-Analytic Models (SAMs)
3
![Page 4: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/4.jpg)
2017 Mock Perth - ICRAR/ UWA
What I am working with?• SURFS simulation suite [Elahi et al, in progress]
• Various simulation sizes from 40 to 900 Mpc • With particle numbers from 512 to 2048
• VELOCIraptor -STF [Elahi et al, 2011] • 6DFOF halo finder • Able to disentangle major mergers • Treefrog
4
3
3
3
![Page 5: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/5.jpg)
2017 Mock Perth - ICRAR/ UWA
What have I done?
• Optimise VELOCIraptor/ Treefrog to produce better merger trees
5
![Page 6: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/6.jpg)
2017 Mock Perth - ICRAR/ UWA
What have I done?
• Optimise VELOCIraptor/ Treefrog to produce better merger trees
5
![Page 7: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/7.jpg)
2017 Mock Perth - ICRAR/ UWA
VELOCIraptor updates
• Minimum halo size to do another search for more halos • minimum particle per cell • number of cells
• Adaptive linking length (implemented by Rodrigo Canas, PhD student @ ICRAR/UWA) • Velocity • Position
6
![Page 8: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/8.jpg)
2017 Mock Perth - ICRAR/ UWA
• Changed the merit function’s temporal weighting
Treefrog Updates
7
![Page 9: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/9.jpg)
2017 Mock Perth - ICRAR/ UWA
• Changed the merit function’s temporal weighting
Treefrog Updates
7
![Page 10: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/10.jpg)
2017 Mock Perth - ICRAR/ UWA
• Changed the merit function’s temporal weighting
Treefrog Updates
7
![Page 11: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/11.jpg)
2017 Mock Perth - ICRAR/ UWA
Results
8
![Page 12: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/12.jpg)
2017 Mock Perth - ICRAR/ UWA
Results
8
![Page 13: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/13.jpg)
2017 Mock Perth - ICRAR/ UWA
Results cont.
9
![Page 14: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/14.jpg)
2017 Mock Perth - ICRAR/ UWA
Halo Ghosting
10
![Page 15: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/15.jpg)
2017 Mock Perth - ICRAR/ UWA
Halo Ghosting
11
![Page 16: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/16.jpg)
2017 Mock Perth - ICRAR/ UWA
What’s next?• Test & Implement halo ghosting as part of VELOCIraptor
& Treefrog code set
• Create an orbit catalogue of all the orbiting satellites
• Look at parameters of orbits
• See if the properties of the orbits can reveal if a galaxy is quenched or not
12
![Page 17: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/17.jpg)
2017 Mock Perth - ICRAR/ UWA
Longer term project
• Alter Semi-Analytic Models (SAMs)
• Implement what was found from orbit analysis
13
![Page 18: Be nice to satellites, they’re going through a tough …Be nice to satellites, they’re going through a tough phase Rhys Poulton Supervisors: Aaron Robotham and Chris Power Co-Supervisor:](https://reader034.fdocuments.in/reader034/viewer/2022042105/5e83f62d9851b3317672052b/html5/thumbnails/18.jpg)
2017 Mock Perth - ICRAR/ UWA
Summary• Successfully optimised VELOCIraptor and Treefrog to
track halos well inside the virial radius
• Started to look at the halo ghosting
Next steps
• Test and implement halo ghosting
• Create an orbit catalogue
• Input what we learn into SAMs
14