Many models of globular cluster formation assume the presence of cold dense clouds in early universe. Here we re-examine the Fall & Rees (1985) model for formation of proto-globular cluster clouds (PGCCs) via thermal instabilities in a protogalactic halo. We first argue, based on the previous study of two-dimensional numerical simulations of thermally unstable clouds in a stratified halo of gal...

We consider a simple gravitational-heating mechanism for the long-term quenching of cooling flows and star formation in massive dark-matter haloes hosting elliptical galaxies and clusters. The virial shock heating in haloes > 10M⊙ provides natural quenching in 10M⊙ haloes (Birnboim et al. 2007). Analytic estimates and simple simulations argue that the long-term quenching in haloes > Mmin ∼ 7×10...

We estimate the number of templates, computational power, and storage required for a one-step matched filtering search for gravitational waves from inspiraling compact binaries. Our estimates for the one-step search strategy should serve as benchmarks for the evaluation of more sophisticated strategies such as hierarchical searches. We use a discrete family of two-parameter waveform templates b...

Daddi et al. (2003) have recently reported strong clustering of a population of red galaxies at z∼3 in the Hubble Deep Field South (HDF-S). Fitting the observed angular clustering with a power law of index −0.8, they infer a comoving correlation length r0 ∼ 8h Mpc; for a standard cosmology, this r0 would imply that the red galaxies reside in rare, M ≥ 10hM⊙ halos, with each halo hosting ∼ 100 g...

Intervention Patients were allocated to dextroamphetamine sulphate, 15 mg for 28 days then doubled to 30 mg for 56 days {n=47}†; dextroamphetamine sulphate, 30 mg for 28 days and then doubled to 60 mg for 56 days {n=46}†; or to placebo {n=35}†. Patients received dextroamphetamine sulphate sustained release regimen once within 2 hours of awakening, and once 6 hours later. Dosing was supervised i...