C
C. A. Nelson
Researcher at Lawrence Livermore National Laboratory
Publications - 60
Citations - 5691
C. A. Nelson is an academic researcher from Lawrence Livermore National Laboratory. The author has contributed to research in topics: Gravitational microlensing & Stars. The author has an hindex of 35, co-authored 60 publications receiving 5372 citations. Previous affiliations of C. A. Nelson include University of California, Berkeley & Association of Universities for Research in Astronomy.
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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
MACHO Project Limits on Black Hole Dark Matter in the 1-30 M☉ Range
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,Neal 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,Dante Minniti,C. A. Nelson,C. A. Nelson,Bruce A. Peterson,P. Popowski,M. R. Pratt,Peter J. Quinn,Christopher W. Stubbs,William J. Sutherland,A. B. Tomaney,T. Vandehei,T. Vandehei,D. L. Welch +33 more
TL;DR: In this paper, a search for long-duration microlensing events toward the Large Magellanic Cloud (LMC) was conducted and the authors found none and therefore put limits on the contribution of high-mass objects to the Galactic dark matter.
Journal ArticleDOI
MACHO Project Limits on Black Hole Dark Matter in the 1-30 Solar Mass Range
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,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 +23 more
TL;DR: In this article, a search for long duration microlensing events towards the Large Magellanic Cloud was conducted, and the authors found none, and therefore put limits on the contribution of high mass objects to the Galactic dark matter.
Journal ArticleDOI
The MACHO Project: Microlensing Optical Depth Toward the Galactic Bulge from Difference Image Analysis
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,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,Douglas L. Welch +32 more
TL;DR: In this paper, the authors presented the microlensing optical depth toward the Galactic bulge based on the detection of 99 events found in our Difference Image Analysis (DIA) survey.