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  First Resolution of Microlensed Images

Dong, S., Mérand, A., Delplancke-Ströbele, F., Gould, A., Chen, P., Post, R., et al. (2019). First Resolution of Microlensed Images. The Astrophysical Journal, 871.

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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0005-D15E-6 Versions-Permalink: https://hdl.handle.net/21.11116/0000-0005-D15F-5
Genre: Zeitschriftenartikel

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https://ui.adsabs.harvard.edu/abs/2019ApJ...871...70D (beliebiger Volltext)
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 Urheber:
Dong, Subo1, Autor
Mérand, A.1, Autor
Delplancke-Ströbele, F.1, Autor
Gould, Andrew1, Autor
Chen, Ping1, Autor
Post, R.1, Autor
Kochanek, C. S.1, Autor
Stanek, K. Z.1, Autor
Christie, G. W.1, Autor
Mutel, Robert1, Autor
Natusch, T.1, Autor
Holoien, T. W. -S.1, Autor
Prieto, J. L.1, Autor
Shappee, B. J.1, Autor
Thompson, Todd A.1, Autor
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Schlagwörter: gravitational lensing: micro techniques: interferometric Astrophysics - Solar and Stellar Astrophysics Astrophysics - Earth and Planetary Astrophysics Astrophysics - Instrumentation and Methods for Astrophysics
 Zusammenfassung: We employ Very Large Telescope Interferometer GRAVITY to resolve, for the first time, the two images generated by a gravitational microlens. The measurements of the image separation {{‚àÜ }}{Œ∏ }-,+=3.78+/- 0.05 mas, and hence the Einstein radius Œ∏ E = 1.87 ¬± 0.03 mas, are precise. This demonstrates the robustness of the method, provided that the source is bright enough for GRAVITY (K ‚â≤ 10.5) and the image separation is of order of or larger than the fringe spacing. When Œ∏ E is combined with a measurement of the ‚Äúmicrolens parallax‚Äù {œÄ }{{E}}, the two will together yield the lens mass and lens-source relative parallax and proper motion. Because the source parallax and proper motion are well measured by Gaia, this means that the lens characteristics will be fully determined, whether or not it proves to be luminous. This method can be a powerful probe of dark, isolated objects, which are otherwise quite difficult to identify, much less characterize. Our measurement contradicts Einstein‚Äôs prediction that ‚Äúthe luminous circle [i.e., microlensed image] cannot be distinguished‚Äù from a star. Based on observations made with ESO telescopes at Paranal Observatory under program ID 2100.C-5014.

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 Datum: 2019
 Publikationsstatus: Erschienen
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Titel: The Astrophysical Journal
Genre der Quelle: Zeitschrift
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Seiten: - Band / Heft: 871 Artikelnummer: - Start- / Endseite: - Identifikator: -