Galactic Bulge Microlensing Events from the MACHO Collaboration

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The authors present a catalog of 450 relatively high signal-to-noise microlensing events observed by the MACHO collaboration between 1993 and 1999. The events are distributed throughout the fields and, as expected, they show clear concentration toward the Galactic center. No optical depth is given for this sample since no blending efficiency calculation has been performed, and they find evidence for substantial blending. In a companion paper they give optical depths for the sub-sample of events on clump giant source stars, where blending is a less significant effect. Several events with sources that may belong to the Sagittarius dwarf galaxy are ... continued below

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Thomas, C L; Griest, K; Popowski, P; Cook, K H; Drake, A J; Minniti, D et al. June 16, 2005.

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The authors present a catalog of 450 relatively high signal-to-noise microlensing events observed by the MACHO collaboration between 1993 and 1999. The events are distributed throughout the fields and, as expected, they show clear concentration toward the Galactic center. No optical depth is given for this sample since no blending efficiency calculation has been performed, and they find evidence for substantial blending. In a companion paper they give optical depths for the sub-sample of events on clump giant source stars, where blending is a less significant effect. Several events with sources that may belong to the Sagittarius dwarf galaxy are identified. For these events even relatively low dispersion spectra could suffice to classify these events as either consistent with Sagittarius membership or as non-Sagittarius sources. Several unusual events, such as microlensing of periodic variable source stars, binary lens events, and an event showing extended source effects are identified. They also identify a number of contaminating background events as cataclysmic variable stars.

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PDF-file: 48 pages; size: 2.2 Mbytes

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  • Journal Name: Astrophysical Journal; Journal Volume: 631; Journal Issue: 2

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  • Report No.: UCRL-JRNL-213064
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 881074
  • Archival Resource Key: ark:/67531/metadc886054

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 16, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 28, 2016, 6:22 p.m.

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Thomas, C L; Griest, K; Popowski, P; Cook, K H; Drake, A J; Minniti, D et al. Galactic Bulge Microlensing Events from the MACHO Collaboration, article, June 16, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc886054/: accessed May 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.