Abstract
An advanced conceptual design of a high-bit-rate triple product acousto-optical processor is presented that can be applied in a number of astrophysical problems. We briefly describe the Large Millimeter Telescope as one of the potential observational infrastructures where the acousto-optical spectrometer can be successfully used. A summary on the study of molecular gas in relatively old (age > 10 Myr) disks around main sequence stars is provided. We have identified this as one of the science cases in which the proposed processor can have a big impact. Then we put forward triple product acousto-optical processor is able to realize algorithm of the space-and-time integrating, which is desirable for a wideband spectrum analysis of radio-wave signals with an improved resolution providing the resolution power of about 105 - 106. It includes 1D-acousto-optic cells as the input devices for a 2D-optical data processing. The importance of this algorithm is based on exploiting the chirp Z-transform technique providing a 2D-Fourier transform of the input signals. The system produces the folded spectrum, accumulating advantages of both space and time integrating. Its frequency bandwidth is practically equal to the bandwidth of transducers inherent in acousto-optical cells. Then, similar processor is able to provide really high frequency resolution, which is practically equal to the reciprocal of the CCD-matrix photo-detector integration time. Here, the current state of developing the triple product acousto-optical processor in frames of the astrophysical instrumentation is shortly discussed.
Highlights
IntroductionSometimes called astrochemistry, has a long history. Molecules in space have been studied panchromatically since the discovery of diffuse interstellar bands nearly a century ago in the optical spectral range [1,2]
Molecular astrophysics, sometimes called astrochemistry, has a long history
Molecules are present in virtually every astrophysical scenario: Interstellar, circumstellar and pregalactic gas, circumnuclear gas in active galactic nuclei, the atmospheres of stars and planets of the solar system, and very recently in exoplanetary atmospheres [7]
Summary
Sometimes called astrochemistry, has a long history. Molecules in space have been studied panchromatically since the discovery of diffuse interstellar bands nearly a century ago in the optical spectral range [1,2]. The current debate is whether in these systems, like 49 Ceti, the gas is a residual from the primordial gas that survived the early depletion process or corresponds to a second generation material, in a similar way the dust is thought to be replenished by the collision of planetesimals [21] The answer to this controversy will certainly come out from sensitive millimeter wave observations at an increased resolution aimed at detecting molecular gas (primarily of CO) that would be eventually. The above-mentioned spectral resolution and frequency bandwidth can be realized by the triple product acousto-optical processor exploiting a space-and time integrating [22] Such an approach provides the resolution power of about 105 - 106, which makes it possible to investigate the intense emission of the carbon monoxide molecule, 12CO (2-1), and other prominent species such as sulphur dioxide (SO2), cyanoacetylene (C3HN), and others, many of which will be studied for the first time. The expected performances of the radio-wave acousto-optical spectrometer under consideration will be potentially comparable to that of the Atacama Large Millimeter Array (ALMA), and the highest ever achieved in a single dish telescope that will certainly take millimeter wave spectral observations to discovery grounds
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