Context: .Shells in Elliptical Galaxies are faint, sharp-edged features, believed to provide evidence of a recent (˜ 0.5 - 2 × 109 years ago) merger event. We...
Globular clusters in modified Newtonian dynamics: velocity dispersion profiles from self-consistent models
We test the modified Newtonian dynamics (MOND) theory with the velocity dispersion profiles of Galactic globular clusters populating the outermost region of the...
Globular Clusters in Virgo Ellipticals: Unexpected Results for Giants and Dwarfs from Advanced Camera for Surveys Imaging
We have analyzed archival Hubble Space Telescope Advanced Camera for Surveys images in g and z of the globular cluster (GC) systems of 53 ellipticals in the...
Globular Clusters Indicate That Ultra-diffuse Galaxies Are Dwarfs
We present an analysis of archival HST/ACS imaging in the F475W (g 475), F606W (V 606), and F814W (I 814) bands of the globular cluster (GC) system of a large...
Going back to basics: accelerating exoplanet transit modelling using Taylor-series expansion of the orbital motion
A significant fraction of an exoplanet transit model evaluation time is spent calculating projected distances between the planet and its host star. This is a...
GONG Catalog of Solar Filament Oscillations Near Solar Maximum
We have cataloged 196 filament oscillations from the Global Oscillation Network Group Hα network data during several months near the maximum of solar cycle 24...
GOYA Survey: U and B Number Counts in the Groth-Westphal Strip
We present U and B galaxy differential number counts from a field of ~900 arcmin2, based on GOYA Survey imaging of the HST Groth-Westphal strip. Source...
Gradients of chemical abundances in the Milky Way from H II regions: distances derived from Gaia EDR3 parallaxes and temperature inhomogeneities
We present a reassessment of the radial abundance gradients of He, C, N, O, Ne, S, Cl, and Ar in the Milky Way using the deep optical spectra of 42 H II regions...
Gran Telescopio Canarias observations of an overdense region of Lyman α emitters at z = 6.5
We present the results of our search near the end of the Reionization Epoch for faint galaxies. This has been done using very deep OSIRIS images obtained at the...