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collimated galactic winds

Visualization of the velocity structure of galactic outflows in the lower mass, stellar feedback driven regime. Shows a single galaxy, rotated edge-on, with stellar mass M* = 10^10.3 Msun and total Mhalo = 10^11.8 Msun at z = 1. If observed at higher redshift (z ~ 3) such a system would be similar to a Lyman-break galaxy. The field of view is 200 physical kpc, and the background image shows a gas density projection through an equal depth, modulated by the gas velocity field in a 10 kpc thick slice using the line-integral convolution technique (LIC; Cabral & Leedom 1993). Color indicates total gas density, while small-scale variation in black shows the local topography of gas motion. Overlaid on top are streamlines of the same velocity field, to indicate direction and magnitude. Outflows which emerge collimated from the central galaxy traverse rvir=2 (dotted circle), establishing a large-scale, circulatory, galactic-fountain type flow largely confined within the virial radius of the halo (solid circle).

Methods: line integral convolution