C
Charles Alcock
Researcher at Harvard University
Publications - 243
Citations - 15804
Charles Alcock is an academic researcher from Harvard University. The author has contributed to research in topics: Gravitational microlensing & Stars. The author has an hindex of 63, co-authored 234 publications receiving 14966 citations. Previous affiliations of Charles Alcock include CFA Institute & Lawrence Livermore National Laboratory.
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Journal ArticleDOI
An evolution free test for non-zero cosmological constant
TL;DR: In this article, a cosmological test that is a sensitive estimator of Λ is proposed, which involves no correction for evolutionary effects and hints at the statistical problem that its realisation entails.
Journal ArticleDOI
The MACHO Project: Microlensing Results from 5.7 Years of Large Magellanic Cloud Observations
Charles Alcock,Charles Alcock,R. A. Allsman,David R. Alves,Tim Axelrod,Andrew C. Becker,David P. Bennett,David P. Bennett,Kem H Cook,Kem H Cook,N. Dalal,N. Dalal,Andrew J. Drake,Andrew J. Drake,Kenneth C. Freeman,Marla Geha,Kim Griest,Kim Griest,Matthew J. Lehner,S. L. Marshall,S. L. Marshall,Dante Minniti,C. A. Nelson,C. A. Nelson,Bruce A. Peterson,P. Popowski,M. R. Pratt,Peter J. Quinn,Christopher W. Stubbs,Christopher W. Stubbs,Christopher W. Stubbs,William J. Sutherland,A. B. Tomaney,T. Vandehei,T. Vandehei,Douglas L. Welch +35 more
TL;DR: In this paper, an analysis of 5.7 yr of photometry on 11.9 million stars in the Large Magellanic Cloud (LMC) reveals 13-17 microlensing events, which is significantly more than the 2-4 events expected from lensing by known stellar populations.
Journal ArticleDOI
The MACHO Project: Microlensing Results from 5.7 Years of LMC Observations
Charles Alcock,R. A. Allsman,David R. Alves,T. S. Axelrod,A. C. Becker,David P. Bennett,K. H. Cook,Neal Dalal,Andrew J. Drake,Kenneth C. Freeman,Marla Geha,Kim Griest,Matthew J. Lehner,S. L. Marshall,Dante Minniti,C. A. Nelson,Bruce A. Peterson,P. Popowski,Mark Pratt,Peter J. Quinn,Christopher W. Stubbs,William J. Sutherland,A. B. Tomaney,T. Vandehei,D. L. Welch +24 more
TL;DR: In this article, an analysis of 5.7 years of photometry on 11.9 million stars in the Large Magellanic Cloud (LMC) reveals 13 - 17 microlensing events.
Journal ArticleDOI
Are the Magellanic Clouds on Their First Passage about the Milky Way
Gurtina Besla,Nitya Kallivayalil,Lars Hernquist,Brant Robertson,Thomas J. Cox,Roeland P. van der Marel,Charles Alcock +6 more
TL;DR: In this article, the authors reexamine the orbital history of the Magellanic Clouds using the new velocities and a ΛCDM-motivated Milky Way model with virial mass Mvir = 1012 M
Journal ArticleDOI
The MACHO Project Large Magellanic Cloud Microlensing Results from the First Two Years and the Nature of the Galactic Dark Halo
Charles Alcock,Charles Alcock,R. A. Allsman,David R. Alves,David R. Alves,Tim Axelrod,Andrew C. Becker,Andrew C. Becker,David P. Bennett,Kem H Cook,Kem H Cook,Kenneth C. Freeman,Kim Griest,Kim Griest,J. A. Guern,J. A. Guern,Matthew J. Lehner,Matthew J. Lehner,S. L. Marshall,S. L. Marshall,Bruce A. Peterson,M. R. Pratt,M. R. Pratt,M. R. Pratt,Peter J. Quinn,A. W. Rodgers,Christopher W. Stubbs,Christopher W. Stubbs,William J. Sutherland,Douglas L. Welch +29 more
TL;DR: In this paper, the authors estimate the total microlensing optical depth toward the LMC from events with 2 < < 200 days to be τ2002=2.9×10−7 based upon their eight event sample.