Soft X-rays from disk galaxy halos, Ly-alpha emission from forming galaxies, and the z~1 Tully-Fisher relation

Abstract

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 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.

6 pages, To appear in the proceedings of the "Island Universes: Structure and Evolution of Disk Galaxies" conference held in Terschelling, Netherlands, July 2005, ed. R. de Jong (Springer: Dordrecht)

References in corpus (9)

• How Do Galaxies Get Their Gas?
• A Subaru Search for Ly-alpha Blobs in and around the Proto-cluster Region at Redshift z=3.1
• Disk Galaxy Formation in a LambdaCDM Universe
• Discovery of a Large ~200 kpc Gaseous Nebula at z=2.7 with the Spitzer Space Telescope
• Evolution of the Near-Infrared Tully-Fisher Relation: Constraints on the Relationship Between the Stellar and Total Masses of Disk Galaxies since z=1
• The Tully-Fisher relation at intermediate redshift
• The Distribution of Lya-Emitting Galaxies at z=2.3
• The Tully-Fisher relation of distant cluster galaxies
• High-redshift X-ray properties of the haloes of simulated disc galaxies