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BlueMUSE
Blue Multi Unit Spectroscopic Explorer
The Blue Multi Unit Spectroscopic Explorer (BlueMUSE) is an upcoming instrument for ESO’s Very Large Telescope (VLT) at Paranal Observatory in Chile. This unique instrument is an integral field unit spectrograph, optimised for studying blue optical light. Such spectrographs can simultaneously take thousands of images of each astronomical object at slightly different wavelengths; BlueMUSE will therefore provide a spectrum at each spatial pixel, resulting in a full 3D dataset. As the name suggests, BlueMUSE will be similar to the existing MUSE instrument in many respects, but it will observe at shorter, and thus bluer, wavelengths, with higher spectral resolution (how precisely it can distinguish between different wavelengths), and therefore allow astronomers to tackle a wide range of research topics.
For instance, BlueMUSE will be used to survey massive clusters of stars within the Milky Way and neighbouring galaxies, find new binary stars, as well as obtaining precise information on stellar kinematics and composition, providing a comprehensive view of stellar evolution. Moreover, it will also take a closer look at faint galaxies and explore starburst galaxies to investigate their extreme star-formation environments. Regarding nebulae, BlueMUSE will map regions of ionised hydrogen and the interstellar medium. Turning to the distant Universe, it will scrutinise the diffuse material in the space between galaxies, namely the circum-galactic medium, and probe the emergence of the first galaxy clusters.
BlueMUSE is designed to make its own discoveries and to conduct follow-up observations of large-scale imaging surveys, conducted in the optical and near-infrared. Given this, and the wavelength range that it is optimised to observe, it will ideally complement ESO’s upcoming Extremely Large Telescope as well as the James Webb Space Telescope. The astronomical community is eagerly awaiting the completion of BlueMUSE, which is expected to be as successful and productive as its predecessor, MUSE, one of ESO’s most requested instruments.
The instrument is being developed by an international consortium led by the French National Centre for Scientific Research’s (CNRS’s) Centre de Recherche Astrophysique de Lyon (CRAL – CNRS/ENS de Lyon/Claude Bernard Lyon 1 University).
BlueMUSE technical specifications
This table lists the global capabilities of the instrument. The authoritative technical specifications offered for astronomical observations are available on the Science Operations page.
350-580 nm (330-600 nm in extended wavelength rage)
Spatial resolution:
Seeing-limited, with pixels of 0.2 by 0.3 arcsec
Field of view
1 arcmin2
Spectral resolution:
R~2600 at 350 nm and R~4300 at 580 nm
First light date:
2034 (planned)
Science goals:
Stellar properties and chemical composition of massive stars within the Milky way and the local Group, mapping ionised nebulae, starburst and low-surface brightness galaxies, deriving star-formation histories, stellar and gaseous kinematics of galaxies, analysing the properties of the diffuse matter in and between galaxies at different epochs, discovering giant gas nebulae within galaxy proto-clusters
Australia: Australian Astronomical Optics, Macquarie University; France: Centre de Recherche Astrophysique de Lyon, Astrophysics, Instrumentation and Modelling, CEA IRFU CNRS, Université de Paris-Saclay; Germany: Leibniz Institute for Astrophysics Potsdam, in association with the University of Potsdam and the University of Göttingen; UK: Durham University – Centre for Advanced Instrumentation; Switzerland: Ecole Polytechnique Fédérale de Lausanne, Observatoire astronomique de l’Université de Genève; Portugal: Instituto de Astrofisica e Ciencias do Espaco, Porto; Sweden: Stockholm University; ESO (European Southern Observatory) contributes through project management and joint undertakings.
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