Hennawi et al. 2015 “Joe’s Cluster:” z ⇠ 2 M ⇠ 3 ⇥ 1014 M Ly↵ in absorption and emission Problems T cold ⇠ 104 K M cold ⇠ 1011 M n cold ⇠ 1 cm 3 `cold ⌘ N/n ⇠ 40 pc
I atmosphere full of liquid water I density times that of air I “droplet” size ⇠⇠⇠⇠⇠ ⇠ XXXXX X N/n ⇠ 1 m 10 6 m I covering fraction of H H H ⇠ 1 ⇠ 106 1 I …each weighing one ton?!?!?
Far I “Joe’s Cluster:” large covering fraction, small total mass I “Clouds” are really clouds I Hydrodynamics can easily make tiny droplets of cold gas…hard not to, in fact
Far I “Joe’s Cluster:” large covering fraction, small total mass I “Clouds” are really clouds I Hydrodynamics can easily make tiny droplets of cold gas…hard not to, in fact I trouble??
Far I “Joe’s Cluster:” large covering fraction, small total mass I “Clouds” are really clouds I Hydrodynamics can easily make tiny droplets of cold gas…hard not to, in fact I trouble??
Far I “Joe’s Cluster:” large covering fraction, small total mass I “Clouds” are really clouds I Hydrodynamics can easily make tiny droplets of cold gas…hard not to, in fact I trouble??…maybe not!
kpc Takeaway I Several problems with galaxies come from wanting clouds to be big I Big clouds don’t really fit the data, and in any case want to break apart I Rather than worrying about how to keep clouds together, just let them shatter…many of our problems just go away I “clouds” ! clouds