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Your search keyword '"J. A. Guern"' showing total 2 results
Start Over Author "J. A. Guern" Publisher cambridge university press (cup)
2 results on '"J. A. Guern"'

1. Searching For Dark Matter With Gravitational Microlensing: A Report From The MACHO Collaboration

Author

William J. Sutherland, Christopher W. Stubbs, S. L. Marshall, D. L. Welch, Bruce A. Peterson, J. A. Guern, David P. Bennett, Peter J. Quinn, Mark Pratt, R. A. Allsman, Matthew J. Lehner, David R. Alves, T. S. Axelrod, David J Reiss, Kenneth C. Freeman, Charles Alcock, K. H. Cook, A. C. Becker, A. W. Rodgers, and Kim Griest

Subjects
Physics, Dark matter, Astrophysics::Solar and Stellar Astrophysics, Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Gravitational microlensing, Astrophysics::Galaxy Astrophysics
Abstract

Gravitational microlensing is the most straightforward interpretation of the stellar brightenings that have been observed by our team and other experiments. These data have provided some of the most stringent limits to date on the nature of the Galaxy's dark matter halo. The number of events seen towards the LMC indicate that our Galaxy is not surrounded by a “standard” halo of MACHOs in the mass range of 10–6 to 0.3 solar masses. The observed optical depth towards the Galactic Center is an important constraint on the distribution of mass in the plane of the Galaxy.

Published
1996
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2. Properties of LMC Planetary Nebulae and parent populations in the MACHO database

Author

Christopher W. Stubbs, David R. Alves, Charles Alcock, A. W. Rodgers, K. H. Cook, B. A. Peterson, K. Griest, W. Sutherland, S. L. Marshall, P. J. Quinn, David P. Bennett, J. A. Guern, Andrew C. Becker, D. Welch, Dante Minniti, R. A. Allsman, K. C. Freeman, Tim Axelrod, M. J. Lehner, and M. R. Pratt

Subjects
Physics, Stars, Photometry (astronomy), Database, Star formation, Astronomy, Astrophysics, computer.software_genre, Large Magellanic Cloud, Gravitational microlensing, Planetary nebula, computer
Abstract

The MACHO microlensing experiment's time-sampled photometry database contains blue and red lightcurves for nearly 9 million stars in the central bar region of the Large Magellanic Cloud (LMC). We have identified known LMC Planetary Nebulae (PN) in the database and find one, Jacoby 5, to be variable. We additionally present data on the “parent populations” of LMC PN, and discuss the star formation history of the LMC bar.

Published
1997
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