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Evidence for the Hierarchical Formation of the Galactic Spheroid
Patrick Cote, Ronald O. Marzke, Michael J. West +1
The possibility that the Galactic spheroid was assembled from numerous chemically-distinct, proto-Galactic fragments is investigated using a Monte-Carlo technique designed to simul…
Ultra-Steep Spectrum Radio Galaxies at Hy Redshifts
Wil van Breugel, Carlos De Breuck, Adam Stanford +5
Radio sources have traditionally provided convenient beacons for probing the early Universe. Hy Spinrad was among the first of the tenacious breed of observers who would attempt to…
Calibration of the MACHO Photometry Database
C. Alcock, R. A. Allsman, D. R. Alves +18
The MACHO Project is a microlensing survey that monitors the brightnesses of 60 million stars in the Large Magellanic Cloud (LMC), Small Magellanic Cloud, and Galactic bulge. Our d…
Faint blue objects on the Hubble Deep Field North & South as possible nearby old halo white dwarfs
R. A. Méndez, D. Minniti
Using data derived from the deepest and finest angular resolution images of the universe yet acquired by astronomers at optical wavelengths using the Hubble Space Telescope (HST) i…
Difference Image Analysis of Galactic Microlensing II. Microlensing Events
C. Alcock, R. A. Allsman, D. Alves +18
The MACHO collaboration has been carrying out Difference Image Analysis (DIA) since 1996 with the aim of increasing the sensitivity to the detection of gravitational microlensing.…
Difference Image Analysis of Galactic Microlensing I. Data Analysis
C. Alcock, R. A. Allsman, D. Alves +18
This is a preliminary report on the application of Difference Image Analysis (DIA) to galactic bulge images. The aim of this analysis is to increase the sensitivity to the detectio…