1207.7023 (Ignacio Trujillo et al.)

Stellar halos of disk galaxies at z~1    [PDF]

Ignacio Trujillo, Judit Bakos

Taking advantage of the ultra-deep near-infrared imaging obtained with the HST on the Hubble Ultra Deep Field, we detect and explore for the first time the properties of the stellar haloes of two Milky-Way like galaxies at z~1. We find that the structural properties of those haloes (size and shape) are similar to the ones found in the local universe. However, these high-z stellar haloes are ~3 magnitudes brighter and present bluer colors ((g-r)<0.4 mag) than their local counterparts. The stellar populations of z~1 stellar haloes are compatible with having ages <1 Gyr. This implies that the stars in those haloes were formed basically at 1View original: http://arxiv.org/abs/1207.7023