The origin of metal-rich, highly flattened, and rapidly rotating disk globular cluster system in the Galaxy is one of longstanding issues in the context of the Galaxy formation. Our numerical simulations suggest a new “two-fold” scenario that the disk globular clusters are firstly formed in the high-pressure, dense central region of a gas-rich dwarf galaxy, as induced during the tidal interacti...

We present the first result of a survey for strong galaxy-galaxy lenses in Sloan Digital Sky Survey (SDSS) images. SDSS J082728.70+223256.4 was selected as a lensing candidate using selection criteria based on the color and positions of objects in the SDSS photometric catalog. Follow-up imaging and spectroscopy showed this object to be a lensing system. The lensing galaxy is an elliptical at z ...

We present subarcsecond resolution imaging and spectroscopy of the BL Lac object 1ES 1741+196 and neighboring galaxies. Based on 2−dimensional modelling, the host galaxy of 1ES 1741+196 is a very bright and large elliptical galaxy (MR = −24.85, re = 51.2 kpc) whose overall luminosity distribution deviates significantly from a de Vaucouleurs profile. It is one of the most luminous and largest BL...

We report Australia Telescope Compact Array (ATCA) radio-continuum and ROSAT PSPC X-ray observations of the region surrounding the peculiar galaxy pair ESO 295-IG022, lying at the centre of the poor cluster Abell S0102. We identify a radio galaxy coincident with the galaxy pair, with bipolar, bent radio jets appearing centred on the southern galaxy, and extending both to the south, for about 95...

We present spectroscopic follow-up of an overdensity of galaxies photometrically selected to be at 1.4 < z < 2.5 found in the vicinity of the radio galaxy 7C 1756+6520 at z = 1.4156. Using the DEIMOS optical multi-object spectrograph on the Keck 2 telescope, we observed a total of 129 BzK-selected sources, comprising 82 blue, star-forming galaxy candidates (sBzK) and 47 red, passivelyevolving g...

We present subarcsecond resolution imaging and spectroscopy of the BL Lac object 1ES 1741+196 and neighboring galaxies. Based on 2−dimensional modelling, the host galaxy of 1ES 1741+196 is a very bright and large elliptical galaxy (M R = −24.85, r e = 51.2 kpc) whose overall luminosity distribution deviates significantly from a de Vaucouleurs profile. It is one of the most luminous and largest ...

Deep multi-color galaxy surveys with photometric redshifts will provide a large number of twopoint correlation observables: galaxy-galaxy angular correlations, galaxy-shear cross correlations, and shear-shear correlations between all redshifts. These observables can potentially enable a joint determination of the dark energy dependent evolution of the dark matter and distances as well as the re...

ABSTRACT We investigate a recent claim that observed galaxy clusters produce an order of magnitude more galaxy–galaxy strong lensing (GGSL) than simulated in ? cold dark matter (CDM) cosmology. take from the c-eagle hydrodynamical simulations and calculate expected amount GGSL for sources placed behind at different redshifts. The probability source lensed by one most massive being multiply imag...

Galaxy comoving number density is commonly used to forge progenitor/descendant links between observed galaxy populations at different epochs. However, this method breaks down in the presence of galaxy mergers, or when galaxies experience stochastic growth rates. We present a simple analytic framework to treat the physical processes that drive the evolution and diffusion of galaxies within comov...