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SPT-SLIM: A Line Intensity Mapping Pathfinder for the South Pole Telescope

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Abstract

The South Pole Telescope Summertime Line Intensity Mapper (SPT-SLIM) is a pathfinder experiment that will demonstrate the use of on-chip filter-bank spectrometers for mm-wave line intensity mapping. The SPT-SLIM focal plane consists of 18 dual-polarization filter-bank spectrometers covering 120–180 GHz with resolving power of 300, coupled to aluminum kinetic inductance detectors. A compact cryostat holds the detectors at 100 mK. SPT-SLIM will be deployed to the 10-m South Pole Telescope for observations during the 2023–2024 austral summer without removing the primary receiver. We discuss the overall instrument design, expected detector performance, and sensitivity to the carbon monoxide line signal at \(0.5< z < 2\). The technology and observational techniques demonstrated by SPT-SLIM will enable next-generation line intensity mapping experiments that constrain cosmology beyond the redshift reach of galaxy surveys.

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Acknowledgements

This work is supported by Fermilab under award LDRD-2021-048 and by the National Science Foundation under award AST-2108763. K. S. Karkare is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-2001802.

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Authors and Affiliations

  1. Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL, 60637, USA

    K. S. Karkare, P. S. Barry, B. A. Benson, J. E. Carlstrom, C. L. Chang, J. McMahon & E. Shirokoff

  2. Fermi National Accelerator Laboratory, Batavia, IL, 60510, USA

    K. S. Karkare, A. J. Anderson, B. A. Benson & M. Hollister

  3. High-Energy Physics Division, Argonne National Laboratory, Lemont, IL, 60439, USA

    P. S. Barry, J. E. Carlstrom, T. Cecil, C. L. Chang & Z. Pan

  4. Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL, 60637, USA

    P. S. Barry, B. A. Benson, J. E. Carlstrom, C. L. Chang, J. McMahon & E. Shirokoff

  5. School of Physics & Astronomy, Cardiff University, Cardiff, CF24 3AA, UK

    P. S. Barry & G. Robson

  6. Department of Physics and McGill Space Institute, McGill University, Montreal, QC, H3A2T8, Canada

    M. A. Dobbs, J. Montgomery & M. Rouble

  7. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, 02138, USA

    G. K. Keating

  8. Steward Observatory, University of Arizona, Tucson, AZ, 85721, USA

    D. P. Marrone

  9. Department of Physics, University of Chicago, Chicago, IL, 60637, USA

    J. McMahon

  10. Three-Speed Logic, Inc., Victoria, BC, V8S 3Z5, Canada

    G. Smecher

Authors
  1. K. S. Karkare
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  2. A. J. Anderson
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  3. P. S. Barry
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  5. J. E. Carlstrom
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  6. T. Cecil
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  7. C. L. Chang
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  8. M. A. Dobbs
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  9. M. Hollister
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  10. G. K. Keating
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  12. J. McMahon
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  13. J. Montgomery
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  14. Z. Pan
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  15. G. Robson
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  16. M. Rouble
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  17. E. Shirokoff
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  18. G. Smecher
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Correspondence to K. S. Karkare.

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Karkare, K.S., Anderson, A.J., Barry, P.S. et al. SPT-SLIM: A Line Intensity Mapping Pathfinder for the South Pole Telescope. J Low Temp Phys 209, 758–765 (2022). https://doi.org/10.1007/s10909-022-02702-2

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  • DOI: https://doi.org/10.1007/s10909-022-02702-2

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