Back to Search
Start Over
Observation of Microlensing towards the Galactic Spiral Arms. EROS II 3 year survey
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2001, 373, pp.126-138, HAL
- Publication Year :
- 2000
- Publisher :
- arXiv, 2000.
-
Abstract
- We present an analysis of the light curves of 9.1 million stars observed during three seasons by EROS (Experience de Recherche d'Objets Sombres), in the Galactic plane away from the bulge. Seven stars exhibit luminosity variations compatible with gravitational microlensing effects due to unseen objects. The corresponding optical depth, averaged over four directions, is tau = 0.45 +0.24 -0.11 x 10^-6. While this value is compatible with expectations from simple galactic models under reasonable assumptions on the target distances, we find an excess of events with short timescale towards the direction closest to the Galactic Centre.<br />Comment: 4 pages, 3 figures, submitted for publication in A&A Letters
- Subjects :
- [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Astrophysics::High Energy Astrophysical Phenomena
Astrophysics (astro-ph)
FOS: Physical sciences
High Energy Physics::Experiment
Astrophysics::Earth and Planetary Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Astrophysics::Galaxy Astrophysics
Subjects
Details
- ISSN :
- 00046361
- Database :
- OpenAIRE
- Journal :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2001, 373, pp.126-138, HAL
- Accession number :
- edsair.doi.dedup.....3dfbbfe3bdcc764feebb0799490bc197
- Full Text :
- https://doi.org/10.48550/arxiv.astro-ph/0001083