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posted by Fnord666 on Wednesday March 07 2018, @07:59PM   Printer-friendly
from the seeing-more-clearly dept.

After 12 years of development, the MATISSE interferometry instrument has been installed during the last 3 months at ESO’s Very Large Telescope (VLT). The instrument combines four of the VLT telescopes to obtain an interferometer with an extremely high spatial resolution. This instrument allows astronomers to study the environment of young stars, the surfaces of stars and Active Galactic Nuclei in the mid-infrared wavelength range. In February 2018, MATISSE successfully achieved ‘First Light’. This achievement consummates the decade-long efforts of a large number of engineers and astronomers in europe, including the infrared interferometry research group at the MPIfR in Bonn, Germany.

MATISSE is a second-generation Very Large Telescope Interferometer (VLTI) instrument providing extremely high spatial resolution. It is a combined imager and spectrograph for interferometry in the mid-infrared 3–5 μm spectral region (L- and M-bands) and the 8–13 μm region (N-band). MATISSE builds on the experience gained with the VLTI’s first-generation instruments, but vastly extends their capability to produce detailed images.

The instrument exploits multiple telescopes and the wave nature of the light to produce more detailed images of celestial objects than can be obtained with any existing or planned single telescope. High- resolution imaging in the infrared is technically demanding but has yielded spectacular results in detecting planet-forming discs around stars, images of the surfaces of stars, and dusty discs around Active Galactic Nuclei.

The target of the First Light observation was the bright star Sirius (see Fig. 1). Figure 2 shows the ESO VLT, which consists of four telescopes with a mirror diameter of 8.2 m (the Unit Telescopes) and four telescopes with 1.8 m mirror diameter (the Auxiliary Telescopes).

[...] “Single telescopes can achieve a maximum spatial resolution that is proportional to their mirror diameter. To obtain a higher resolution, we combine or interfere the light from four different VLT telescopes”, says Bruno Lopez from the Observatoire de la Côte d'Azur at Nice, the principal investigator of MATISSE. “This interferometric technique can provide us with a high spatial resolution that is proportional to the distance between the telescopes. Therefore, MATISSE is able to deliver the sharpest images ever in the 3–13 μm wavelength range.

Gerd Weigelt, Coinvestigator at the Max Planck Institute for Radio Astronomy, adds: “MATISSE will also allow us to obtain a high spectral resolution in addition to high spatial resolution. Therefore, we will be able to perform our studies in many different spectral channels distributed across an individual spectral line and even measure the velocity distribution in astronomical objects, which is very essential to reveal the physical properties of the objects.”

The MATISSE spectral bands will provide mid-infrared high angular resolution images that can be linked to observations at similar resolution in the submillimetre domain, with the Atacama Large Millimeter/Submillimeter Array (ALMA). MATISSE can be seen as a successor to MIDI (the MID-infrared Interferometric instrument) and a precursor of the future METIS instrument for the ELT.


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  • (Score: 2) by bob_super on Wednesday March 07 2018, @11:09PM (1 child)

    by bob_super (1357) on Wednesday March 07 2018, @11:09PM (#649217)

    TIL that JWST doesn't need a dewar and/or giant block of exotic ice. Sunshield plus passive cooling is enough to keep you at 50K.
    Maybe, instead of the complex L2 halo orbit, we should throw the thing perpendicular to the ecliptic plane, fast enough that it wouldn't come back before at least 30 years (or never). That would make cooling easier, keep it away from the planets, at the cost of a bit (ok, a lot) of bandwidth.

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  • (Score: 2) by takyon on Wednesday March 07 2018, @11:45PM

    by takyon (881) <reversethis-{gro ... s} {ta} {noykat}> on Wednesday March 07 2018, @11:45PM (#649231) Journal

    I think your proposal would make it significantly harder to communicate with it than the planned orbit. Data rate will go way down because it would move far away from Earth. It will be more difficult to keep it pointing away from the Sun and other hazards (it can't point at the Moon or Earth either in planned orbit).

    The orbit also doesn't seem that complex. It just has an expiration date. But it might be salvageable or serviceable even if it slips into a regular heliocentric orbit.

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