Transcript
Cluster FormationMassive
Eli Bressert@astrobiased
Bolton Fellow
1 2
How do YMCs form?
Where are the progenitors?
What is a young massive cluster?
M > ~ 10 ☉M 4
r ~ 5 pc
t ~ 2 MyrPortegies-Zwart et al. 2010
Credit: ESO/VISTA Magellanic Cloud survey
100 pc
R1361-2 Myr
>104 M⊙
SFE > 30 %
15 pc
Credit: ESO/S. Guisard
Ophiuchus~2 Myr
~102 M⊙
SFE < 10 %
15 pc
Credit: ESO/S. Guisard
Ophiuchus~2 Myr
~102 M⊙
SFE < 10 %
Theory
Cluster
Clump
Potential
Kinetic
vesc > CII
Bressert et al. (2012)
vesc > CII
10 km/s
Bressert et al. (2012)
⌦ = vescCII
Bressert et al. (2012)
Ω < 1
Ω >1
Are these precursors important?
We clusters
Meanwhile, back in the Galactic Centre ...
The BrickLongmore et al. (2012)
Credit: NASA/JPL-Caltech/GLIMPSE Team
Bressert et al. (2012) Ginsburg et al. (2012)
d < 20 kpc
d < 40 Mpc
F = 31 Jy500
F = 4 Jy850
F = 2 Jy1100
F = 78 mJy500
F = 8 mJy850
F = 2 mJy1200
We are able to detect all YMC progenitors in the observed Milky Way
?
Bressert et al. (2012)
Pw ⇠ 10�10 dynes cm�2. . .h
Df
2 pc
i�2
Prad ⇠ 10�10 dynes cm�2. . .h
Df
2 pc
i�2
PH ii ⇠ 10�9 dynes cm�2. . .h
Df
2 pc
i�3/2
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