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arxiv: 1907.04756 · v1 · pith:Z4GJG5IYnew · submitted 2019-07-10 · 🌌 astro-ph.IM

The Atacama Large Aperture Submillimeter Telescope (AtLAST)

Pamela Klaassen (UK Astronomy Technology Centre) , Tony Mroczkowski (European Southern Observatory) , Sean Bryan (Arizona State University) , Christopher Groppi (Arizona State University) , Kaustuv Basu (University of Bonn) , Claudia Cicone (University of Oslo) , Helmut Dannerbauer (Instituto de Astrofisica de Canarias Universidad de La Laguna) , Carlos De Breuck (European Southern Observatory)
show 9 more authors
William J. Fischer (Space Telescope Science Institute) James Geach (University of Hertfordshire) Evanthia Hatziminaoglou (European Southern Observatory) Wayne Holland (UK Astronomy Technology Centre) Ryohei Kawabe (National Astronomical Observatory of Japan) Neelima Sehgal (Stony Brook University Flatiron Institute) Thomas Stanke (European Southern Observatory) Eelco van Kampen (European Southern Observatory)
This is my paper

Pith reviewed 2026-05-24 23:33 UTC · model grok-4.3

classification 🌌 astro-ph.IM
keywords AtLASTsubmillimeter telescopesingle-dishmapping speedfield of viewAtacamainstrumentationlarge aperture
0
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The pith

A 50-meter single-dish submillimeter telescope with a one-degree field of view would map the sky thousands of times faster than any existing facility.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper argues that existing single-dish sub-mm facilities lack the sensitivity needed for large-scale structures in the universe, while interferometers provide high resolution but miss broader context. It presents the concept for AtLAST, a 50m class telescope sited on the Atacama plateau and equipped with a 1° field of view plus highly multiplexed instruments such as spectrometers, continuum cameras, and integral field units. If built as an international partnership, this telescope would deliver mapping speeds thousands of times greater than current or planned facilities. Those gains would allow it to reach confusion limits below L* in the distant universe and resolve low-mass protostellar cores at the distance of the Galactic Center, while observing frequencies unavailable to other observatories.

Core claim

AtLAST is a 50m class single dish telescope with high throughput and 1° FoV with a full complement of advanced instrumentation, including highly multiplexed high-resolution spectrometers, continuum cameras and Integral Field Units. It will have mapping speeds thousands of times greater than any current or planned facility, reaching confusion limits below L* in the distant universe and resolving low-mass protostellar cores at the distance of the Galactic Center, providing synergies with upcoming facilities across the spectrum and enabling a fundamentally new understanding of the sub-mm universe at unprecedented depths.

What carries the argument

The 50m aperture with 1° field of view and highly multiplexed instruments sited on the Atacama plateau.

If this is right

  • It will reach confusion limits below L* in the distant universe.
  • It will resolve low-mass protostellar cores at the distance of the Galactic Center.
  • It will provide synergies with upcoming facilities across the spectrum.
  • It will enable observations at frequencies unobtainable by other observatories.
  • It will support a comprehensive view of the formation, destruction, and evolution of objects in the universe.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The telescope could supply the missing large-scale context needed to interpret high-resolution data from interferometers like ALMA.
  • International partnerships could spread construction and operating costs while broadening access to sub-mm data.
  • Routine wide-field sub-mm mapping might accelerate statistical studies of galaxy populations and star-forming regions.
  • Later instrument upgrades could extend the initial science return without requiring a new facility.

Load-bearing premise

That a 50m single-dish submm telescope with 1° field of view and advanced multiplexed instruments can be constructed and operated on the Atacama plateau without insurmountable technical or financial obstacles.

What would settle it

Detailed engineering studies or cost models showing that the required aperture, field of view, and instrument multiplexing cannot be achieved within practical time and budget limits, or on-sky verification that mapping speeds fall short of the projected gains.

Figures

Figures reproduced from arXiv: 1907.04756 by Carlos De Breuck (European Southern Observatory), Christopher Groppi (Arizona State University), Claudia Cicone (University of Oslo), Eelco van Kampen (European Southern Observatory), Evanthia Hatziminaoglou (European Southern Observatory), Flatiron Institute), Helmut Dannerbauer (Instituto de Astrofisica de Canarias Universidad de La Laguna), James Geach (University of Hertfordshire), Kaustuv Basu (University of Bonn), Neelima Sehgal (Stony Brook University, Pamela Klaassen (UK Astronomy Technology Centre), Ryohei Kawabe (National Astronomical Observatory of Japan), Sean Bryan (Arizona State University), Thomas Stanke (European Southern Observatory), Tony Mroczkowski (European Southern Observatory), Wayne Holland (UK Astronomy Technology Centre), William J. Fischer (Space Telescope Science Institute).

Figure 1
Figure 1. Figure 1: CASA simulation of the expected molecular CGM of a star forming galaxy at z = 0.02.Panel (a) shows the input, while panels (b-d) show CASA simulations corresponding to: (b) a map obtained with a 50-m SD telescope equipped with a single ALMA detector; (c) an ACA 7m mosaic map; (d) a 576 pointing ALMA 12m mosaic map. All images are 4x4 arcmin. Time-domain photometry is also needed to probe the physics of acc… view at source ↗
Figure 2
Figure 2. Figure 2: , we show the throughputs (≡ AΩ, FoV × collecting area) of most known existing and future sub-mm/mm facilities, plotted against (approximate or planned) year of construction, which highlights AtLAST’s uniqueness in this landscape [PITH_FULL_IMAGE:figures/full_fig_p009_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Mapping of science cases (left) to proposed first light instrument suite (right) showing that each instrument can be used for a multitude of science cases. • Wideband IFU (TRL ∼ 4) Direct-detection, ultra-wide bandwidth mm/sub-mm-wave inte￾gral field units (IFUs) with resolving power R ≈ 300 − 1000, with effective receiver noise temperatures comparable to the quantum noise limit. Such IFUs will require & 1… view at source ↗
Figure 4
Figure 4. Figure 4: Transmission com￾parison for the CCAT-prime site, ALMA, Mauna Kea, and LMT sites for the upper quar￾tile weather using the year￾round average data and the am model [59]. Since transmis￾sion impacts both the signal and the noise, improvements impact the mapping speed ∝ 4th power (i.e. 42% better transmission results in ∼ 4× the mapping speed). 200 400 600 800 1000 1200 1400 1600 1800 2000 (GHz) 0 10 20 30 4… view at source ↗
read the original abstract

The sub-mm sky is a unique window for probing the architecture of the Universe and structures within it. From the discovery of dusty sub-mm galaxies, to the ringed nature of protostellar disks, our understanding of the formation, destruction, and evolution of objects in the Universe requires a comprehensive view of the sub-mm sky. The current generation single-dish sub-mm facilities have shown of the potential for discovery, while interferometers have presented a high resolution view into the finer details. However, our understanding of large-scale structure and our full use of these interferometers is now hampered by the limited sensitivity of our sub-mm view of the universe at larger scales. Thus, now is the time to start planning the next generation of sub-mm single dish facilities, to build on these revolutions in our understanding of the sub-mm sky. Here we present the case for the Atacama Large Aperture Submillimeter Telescope (AtLAST), a concept for a 50m class single dish telescope. We envision AtLAST as a facility operating as an international partnership with a suite of instruments to deliver the transformative science described in many Astro2020 science white papers. A 50m telescope with a high throughput and 1$^\circ$ FoV with a full complement of advanced instrumentation, including highly multiplexed high-resolution spectrometers, continuum cameras and Integral Field Units, AtLAST will have mapping speeds thousands of times greater than any current or planned facility. It will reach confusion limits below $L_*$ in the distant universe and resolve low-mass protostellar cores at the distance of the Galactic Center, providing synergies with upcoming facilities across the spectrum. Located on the Atacama plateau, to observe frequencies un-obtainable by other observatories, AtLAST will enable a fundamentally new understanding of the sub-mm universe at unprecedented depths.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 0 minor

Summary. The manuscript presents the scientific case for the Atacama Large Aperture Submillimeter Telescope (AtLAST), a proposed 50 m single-dish submillimeter facility on the Atacama plateau with a 1° field of view and a full suite of highly multiplexed instruments (continuum cameras, high-resolution spectrometers, and integral field units). It claims that these specifications will deliver mapping speeds thousands of times greater than any current or planned facility, reaching confusion limits below L* in the distant universe and resolving low-mass protostellar cores at Galactic Center distances, while providing synergies with interferometers and other multi-wavelength facilities.

Significance. If the stated aperture, field of view, and instrument multiplexing can be realized, AtLAST would close a critical gap in submillimeter astronomy by enabling wide-field, high-sensitivity mapping that complements ALMA's high-resolution capabilities. The paper correctly identifies the limitations of existing single-dish facilities for large-scale structure studies and ties the concept to multiple Astro2020 white papers, underscoring its potential for transformative science in galaxy evolution, star formation, and cosmology.

major comments (2)
  1. [Abstract] Abstract: The headline claim that AtLAST 'will have mapping speeds thousands of times greater than any current or planned facility' is presented as a design outcome without any scaling calculation, throughput comparison to existing 12–30 m dishes, atmospheric transmission modeling, or reference to optical performance studies that would justify the 50 m aperture plus 1° FoV at sub-mm wavelengths.
  2. [Abstract] Abstract: The assertion that the telescope will 'reach confusion limits below L* in the distant universe and resolve low-mass protostellar cores at the distance of the Galactic Center' rests on the unvalidated assumption that the required image quality and field can be achieved; no ray-tracing, Strehl ratio estimates, or error budget is supplied to support this quantitative performance.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful review and constructive comments on the AtLAST concept paper. We address each major comment below and indicate where revisions to the manuscript will be made.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The headline claim that AtLAST 'will have mapping speeds thousands of times greater than any current or planned facility' is presented as a design outcome without any scaling calculation, throughput comparison to existing 12–30 m dishes, atmospheric transmission modeling, or reference to optical performance studies that would justify the 50 m aperture plus 1° FoV at sub-mm wavelengths.

    Authors: We agree that the abstract presents this performance claim at a high level without explicit supporting calculations. The manuscript body provides the design rationale, including the benefits of the 50 m aperture combined with the 1° FoV and instrument multiplexing, along with comparisons to current facilities. To address the comment directly, we will revise the abstract to include a brief qualifier referencing the quantitative design studies and throughput arguments developed in the main text. revision: yes

  2. Referee: [Abstract] Abstract: The assertion that the telescope will 'reach confusion limits below L* in the distant universe and resolve low-mass protostellar cores at the distance of the Galactic Center' rests on the unvalidated assumption that the required image quality and field can be achieved; no ray-tracing, Strehl ratio estimates, or error budget is supplied to support this quantitative performance.

    Authors: The quoted performance goals are target metrics based on the proposed 50 m aperture and 1° FoV specifications. As this is a concept paper, the detailed optical modeling, ray-tracing, and error budgets are referenced via the linked Astro2020 white papers and will be developed in the preliminary design phase. We will revise the abstract to clarify that these outcomes assume successful realization of the stated design parameters and image quality, thereby qualifying the claims without overstating current validation. revision: yes

Circularity Check

0 steps flagged

No circularity: concept paper states design goals without equations, fits, or derivations

full rationale

The paper is a forward-looking science case and facility concept statement. It asserts that a 50 m telescope with 1° FoV and multiplexed instruments 'will have mapping speeds thousands of times greater' but supplies no equations, scaling relations, parameter fits, or derivations that could reduce to inputs by construction. No self-citations, uniqueness theorems, or ansatzes are invoked to support quantitative claims. The reader's assessment of score 0.0 is confirmed by direct inspection of the provided text.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

This is a facility concept paper with no mathematical derivations, fitted parameters, or new physical entities; all content is descriptive of a proposed instrument.

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discussion (0)

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Reference graph

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