Bulge microlensing optical depth from EROS 2 observations $^{\bullet}$
| العنوان: | Bulge microlensing optical depth from EROS 2 observations $^{\bullet}$ |
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| المؤلفون: | C. Afonso, J. N. Albert, C. Alard, J. Andersen, R. Ansari, É. Aubourg, P. Bareyre, F. Bauer, J. P. Beaulieu, G. Blanc, A. Bouquet, S. Char, X. Charlot, F. Couchot, C. Coutures, F. Derue, R. Ferlet, P. Fouqué, J. F. Glicenstein, B. Goldman, A. Gould, D. Graff, M. Gros, J. Haissinski, C. Hamadache, J. C. Hamilton, D. Hardin, J. de Kat, A. Kim, T. Lasserre, L. LeGuillou, É. Lesquoy, C. Loup, C. Magneville, B. Mansoux, J. B. Marquette, É. Maurice, A. Maury, A. Milsztajn, M. Moniez, N. Palanque-Delabrouille, O. Perdereau, L. Prévot, N. Regnault, J. Rich, M. Spiro, P. Tisserand, A. Vidal-Madjar, L. Vigroux, S. Zylberajch |
| المصدر: | Astronomy & Astrophysics. 404:145-156 |
| بيانات النشر: | EDP Sciences, 2003. |
| سنة النشر: | 2003 |
| مصطلحات موضوعية: | Physics, 010308 nuclear & particles physics, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Gravitational microlensing, 01 natural sciences, Stars, Space and Planetary Science, Bulge, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Optical depth |
| الوصف: | We present a measurement of the microlensing optical depth toward the Galactic bulge based on the analysis of 15 contiguous1 square degrees fields centered on (l=2.5 deg, b=-4.0 deg) and containing 1.42 million clump-giant stars (belonging to the extended clump area) monitored during almost three bulge seasons by EROS (Experience de Recherche d'Objets Sombres). We find a microlensing optical depth towards the bulge tau_bulge=0.94 +/- 0.29 10^-6 averaged over all fields, based on 16 microlensing events with clump giants as sources. This value is substantially below several other determinations by the MACHO and OGLE groups and is more in agreement with what is expected from axisymmetric and non-axisymmetric bulge models. |
| تدمد: | 1432-0746 0004-6361 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::abf5acbbf6a8cef8cf1a06bac2d1d3a7 https://doi.org/10.1051/0004-6361:20030307 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........abf5acbbf6a8cef8cf1a06bac2d1d3a7 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14320746 00046361 |
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