X-RAYS FROM DISK GALAXY HALOS,LYa FROM FORMING GALAXIES,AND THE Z~1 TULLY-FISHER RELATION [chapter]

Jesper Sommer-Larsen
ISLAND UNIVERSES  
Extended, soft X-ray emission from the halo of a very large disk galaxy has been detected out to r~20-40 kpc. The luminosity and surface brightness distribution is in very good agreement with predictions by recent, cosmological galaxy formation models. Predictions of Ly-alpha emission, associated with "cold" accretion of filamentary gas onto galaxies, are presented. In particular these predictions are compared to the properties of a recently detected Ly-alpha "blob", which shows no obvious
more » ... ows no obvious continuum counter-part in any of 12 broad-bands, from X-rays (Chandra) to infrared (Spitzer). Finally, the predicted evolution of the Tully-Fisher relation, going from z=0 to 1, is discussed in relation to recent observations.
doi:10.1007/978-1-4020-5573-7_94 fatcat:lulvgxklv5bcvjec3rwph2ylxm