Raman-scattered laser guide-star photons to monitor the scatter of astronomical telescope mirrorsстатья из журнала
Аннотация: The first observations of laser guide-star photons that are Raman-scattered by air molecules above the Very Large Telescope (VLT) were reported in June 2017. The initial detection came from the Multi-Unit Spectroscopic Explorer (MUSE) optical integral field spectrograph, following the installation of the 4 Laser Guide Star Facility (4LGSF) on Unit Telescope 4 (UT4) of the VLT. In this Letter, we delve further into the symbiotic relationship between the 4LGSF laser guide-star system, the UT4 telescope, and MUSE by monitoring the spectral contamination of MUSE observations by Raman photons over a 27-month period. This dataset reveals that dust particles deposited on the primary and tertiary mirrors of UT4, which are responsible for a reflectivity loss of ∼8% at 6000 Å, contribute (60 ± 5)% to the laser line fluxes detected by MUSE. The flux of Raman lines, which contaminates scientific observations that are acquired with optical spectrographs, thus provides a new, non-invasive means to monitor the evolving scatter properties of the mirrors of astronomical telescopes that are equipped with laser guide-star systems.
Год издания: 2018
Авторы: F. Vogt, José Luis Álvarez, Domenico Bonaccini Calia, W. Hackenberg, P. Bourget, Ivan Aranda, Callum Bellhouse, Israel Blanchard, Susana Cerda, Claudia Cid, Mauro Comin, Marcela Espinoza Contreras, G. K. T. Hau, Pascale Hibon, Ronald Holzlöhner, Yara L. Jaffé, Johann Kolb, H. Kuntschner, Pierre-Yves Madec, Steffen Mieske, J. Milli, Cyrielle Opitom, Diego Parraguez, Cristian Romero, F. Selman, L. Schmidtobreick, J. V. Smoker, Sergio Vera Urrutia, G. Zins
Издательство: EDP Sciences
Источник: Astronomy and Astrophysics
Ключевые слова: Stellar, planetary, and galactic studies, Adaptive optics and wavefront sensing, Ocular and Laser Science Research
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Astronomy and Astrophysics (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
Springer Link (Chiba Institute of Technology) (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
DataCite API (HTML)
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Том: 618
Страницы: L7–L7