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