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Astrophysics > Instrumentation and Methods for Astrophysics

arXiv:2103.08623 (astro-ph)
[Submitted on 15 Mar 2021]

Title:A Lunar Farside Low Radio Frequency Array for Dark Ages 21-cm
Cosmology

Authors:Jack Burns, Gregg Hallinan, Tzu-Ching Chang, Marin Anderson,
Judd Bowman, Richard Bradley, Steven Furlanetto, Alex Hegedus, Justin
Kasper, Jonathan Kocz, Joseph Lazio, Jim Lux, Robert MacDowall,
Jordan Mirocha, Issa Nesnas, Jonathan Pober, Ronald Polidan, David
Rapetti, Andres Romero-Wolf, Anze Slosar, Albert Stebbins, Lawrence
Teitelbaum, Martin White
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    Abstract: An array of low-frequency dipole antennas on the lunar
    farside surface will probe a unique, unexplored epoch in the
    early Universe called the Dark Ages. It begins at Recombination
    when neutral hydrogen atoms formed, first revealed by the cosmic
    microwave background. This epoch is free of stars and
    astrophysics, so it is ideal to investigate high energy particle
    processes including dark matter, early Dark Energy, neutrinos,
    and cosmic strings. A NASA-funded study investigated the design
    of the instrument and the deployment strategy from a lander of
    128 pairs of antenna dipoles across a 10 kmx10 km area on the
    lunar surface. The antenna nodes are tethered to the lander for
    central data processing, power, and data transmission to a relay
    satellite. The array, named FARSIDE, would provide the capability
    to image the entire sky in 1400 channels spanning frequencies
    from 100 kHz to 40 MHz, extending down two orders of magnitude
    below bands accessible to ground-based radio astronomy. The lunar
    farside can simultaneously provide isolation from terrestrial
    radio frequency interference, the Earth's auroral kilometric
    radiation, and plasma noise from the solar wind. It is thus the
    only location within the inner solar system from which sky noise
    limited observations can be carried out at sub-MHz frequencies.
    Through precision calibration via an orbiting beacon and
    exquisite foreground characterization, the farside array would
    measure the Dark Ages global 21-cm signal at redshifts z~35-200.
    It will also be a pathfinder for a larger 21-cm power spectrum
    instrument by carefully measuring the foreground with high
    dynamic range.

          14 pages, 3 figures, 1 table, response to DOE request for
Comments: information on lunar farside radio telescope to explore the
          early universe. arXiv admin note: substantial text overlap
          with arXiv:1911.08649
          Instrumentation and Methods for Astrophysics (astro-ph.IM);
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); High
          Energy Physics - Experiment (hep-ex)
Cite as:  arXiv:2103.08623 [astro-ph.IM]
          (or arXiv:2103.08623v1 [astro-ph.IM] for this version)

Submission history

From: Jack Burns [view email]
[v1] Mon, 15 Mar 2021 18:05:17 UTC (996 KB)
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