Microlensing events toward the Galactic bulge Virtual Observatory Resource

Authors
  1. Mroz P.
  2. Udalski A.
  3. Skowron J.
  4. Szymanski M.K.
  5. Soszynski I.,Wyrzykowski L.
  6. Pietrukowicz P.
  7. Kozlowski S.
  8. Poleski R.
  9. Ulaczyk K.,Rybicki K.
  10. Iwanek P.
  11. Published by
    CDS
Abstract

The number and properties of observed gravitational microlensing events depend on the distribution and kinematics of stars and other compact objects along the line of sight. In particular, precise measurements of the microlensing optical depth and event rate toward the Galactic bulge enable strict tests of competing models of the Milky Way. Previous estimates, based on samples of up to a few hundred events, gave larger values than expected from the Galactic models and were difficult to reconcile with other constraints on the Galactic structure. Here we used long-term photometric observations of the Galactic bulge by the Optical Gravitational Lensing Experiment (OGLE) to select a homogeneous sample of 8000 gravitational microlensing events. We created the largest and most accurate microlensing optical depth and event rate maps of the Galactic bulge. The new maps ease the tension between the previous measurements and Galactic models. They are consistent with some earlier calculations based on bright stars and are systematically ~30% smaller than the other estimates based on "all-source" samples of microlensing events. The difference is caused by the careful estimation of the source star population. The new maps agree well with predictions based on the Besancon model of the Galaxy. Apart from testing the Milky Way models, our maps may have numerous other applications, such as the measurement of the initial mass function or constraining the dark matter content in the Milky Way center. The new maps will also inform the planning of future space-based microlensing experiments by revising the expected number of events.

Keywords
  1. Gravitational lensing
  2. Milky Way Galaxy
  3. Infrared photometry
  4. Optical astronomy
  5. Photometry
Bibliographic source Bibcode
2019ApJS..244...29M
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/244/29
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJS/244/29
Document Object Identifer DOI
doi:10.26093/cds/vizier.22440029

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/244/29
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/244/29
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/244/29
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/244/29/table3?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/244/29/table3?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/244/29/table3?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/244/29/table5?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/244/29/table5?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/244/29/table5?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/244/29/fields?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/244/29/fields?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/244/29/fields?

History

2020-04-14T12:24:10Z
Resource record created
2020-04-14T12:24:10Z
Created
2021-09-10T14:03:18Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr