From galaxy mergers we now turn to Black Hole mergers.
TMaximum Black Hole Mass Across Cosmic Time
Jorick Vink
This is a weird system with 2 larger then necassarily steller mass systems merging into an intermediate mass Black Hole!
Q - What is max mass of Star/BH?
1/
TMaximum Black Hole Mass Across Cosmic Time
Jorick Vink
This is a weird system with 2 larger then necassarily steller mass systems merging into an intermediate mass Black Hole!
Q - What is max mass of Star/BH?
1/
It was thought that as steller masses increase, steller winds increasm causing more and more material to be lost through wind, and lower the max mass of the star. BUT… is this always true?
No - stars with lots of metals have more possible spectral lines and lower max mass
2/
No - stars with lots of metals have more possible spectral lines and lower max mass
2/
On the other hand, if you have very very low metallicity stars - stars missing heavy atoms - then stars can get much much bigger, and bigger black holes can result from the evolution of a single star.
Stars even up to 100 solar masses!
This can lead to the 85 solar mass BH
3/
Stars even up to 100 solar masses!
This can lead to the 85 solar mass BH
3/
This work is getting published in Vink et al 2021, MNRAS 504,146.
Final result: The maximum black hole mass changes over time, with larger mass black holes forming from earliest stars.
Personal comment: This does not mean all 85 solar mass BH’s come from single stars.
4/
Final result: The maximum black hole mass changes over time, with larger mass black holes forming from earliest stars.
Personal comment: This does not mean all 85 solar mass BH’s come from single stars.
4/
It is still not easy to go from potential formation of 85 solar mass Black Holes to the formation of supermassive black holes via mergers. Another story likely still needed to explain the earliest massive black holes in the cores of galaxies, but that’s ok. More science!
/fini
/fini
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