The position of the recently discovered transient gamma-ray source J0109+6134 (ATEL #2414) lies within the footprints of the IPHAS (Drew et al. 2005, MNRAS, 362, 753; http://www.iphas.org) and UVEX (Groot et al. 2009, MNRAS, 399, 323) surveys of the northern Galactic plane. Paredes et al. (ATEL #2421) have already suggested an optical counterpart

We study the evolution of galaxy structure since z ~ 1 to the present. From a Great Observatories Origins Deep Survey South (GOODS-S) multi-band catalog, we define (blue) luminosity- and mass-weighted samples, limited by MB = 1010 M sun, comprising 1122 and 987 galaxies, respectively. We extract early-type (ET; E/S0/Sa) and late-type (LT; Sb-Irr)

We present simulations of dry-merger encounters between pairs of elliptical galaxies with dark matter halos. The aim of these simulations is to study the intergalactic (IG) stellar populations produced in both parabolic and hyperbolic encounters. We model progenitor galaxies with total-to-luminous mass ratios MT /M L= 3 and 11. The initial mass of

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Using Advanced Camera for Surveys-Hubble Space Telescope images to yield continuum-subtracted photometric maps in Hα of the Sbc galaxy M51 and the dwarf irregular galaxy NGC 4449, we produced extensive (over 2000 regions for M51 and over 200 regions for NGC 4449) catalogs of parameters of their H II regions: their Hα luminosities, equivalent radii

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