Kavli Affiliate: Claudio Ricci
| First 5 Authors: Mark Booth, Pamela Klaassen, Claudia Cicone, Tony Mroczkowski, Martin A. Cordiner
| Summary:
Submillimeter and millimeter wavelengths provide a unique view of the
Universe, from the gas and dust that fills and surrounds galaxies to the
chromosphere of our own Sun. Current single-dish facilities have presented a
tantalising view of the brightest (sub-)mm sources, and interferometers have
provided the exquisite resolution necessary to analyse the details in small
fields, but there are still many open questions that cannot be answered with
current facilities. In this report we summarise the science that is guiding the
design of the Atacama Large Aperture Submillimeter Telescope (AtLAST). We
demonstrate how tranformational advances in topics including star formation in
high redshift galaxies, the diffuse circumgalactic medium, Galactic ecology,
cometary compositions and solar flares motivate the need for a 50m, single-dish
telescope with a 1-2 degree field of view and a new generation of highly
multiplexed continuum and spectral cameras. AtLAST will have the resolution to
drastically lower the confusion limit compared to current single-dish
facilities, whilst also being able to rapidly map large areas of the sky and
detect extended, diffuse structures. Its high sensitivity and large field of
view will open up the field of submillimeter transient science by increasing
the probability of serendipitous detections. Finally, the science cases listed
here motivate the need for a highly flexible operations model capable of short
observations of individual targets, large surveys, monitoring programmes,
target of opportunity observations and coordinated observations with other
observatories. AtLAST aims to be a sustainable, upgradeable, multipurpose
facility that will deliver orders of magnitude increases in sensitivity and
mapping speeds over current and planned submillimeter observatories.
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