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Entropy Injection as a Global Feedback Mechanism
S. Peng Oh, Andrew Benson
Both preheating of the intergalactic medium and radiative cooling of low entropy gas have been proposed to explain the deviation from self-similarity in the cluster L_x-T_x relatio…
The abundance of dark galaxies
Licia Verde, S. Peng Oh, Raul Jimenez
We show that gas in a large fraction of low mass dark matter halos may form Toomre stable disks, if angular momentum is conserved when the gas contracts. Such halos would be stable…
Probing the Dark Ages with Metal Absorption Lines
S. Peng Oh
Recent observations of high redshift quasars at z~6 have finally revealed complete Gunn-Peterson absorption. However, this at best constrains the volume-weighted and mass-weighted…
Dark halo properties from rotation curves
Raul Jimenez, Licia Verde, S. Peng Oh
We study a large set of high spatial resolution optical rotation curves of galaxies with the goal of determining the model parameters for a disk embedded within a CDM halo that we…