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    A Serendipitous MWA Search for Narrowband Signals from 'Oumuamua

    265790.pdf (1.144Mb)
    Access Status
    Open access
    Authors
    Tingay, Steven
    Kaplan, D.
    Lenc, E.
    Croft, S.
    McKinley, B.
    Beardsley, A.
    Crosse, B.
    Emrich, David
    Franzen, Thomas
    Gaensler, B.
    Horsley, L.
    Johnston-Hollitt, M.
    Kenney, David
    Morales, M.
    Pallot, D.
    Steele, K.
    Trott, Cathryn
    Walker, M.
    Wayth, Randall
    Williams, A.
    Wu, C.
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Tingay, S. and Kaplan, D. and Lenc, E. and Croft, S. and McKinley, B. and Beardsley, A. and Crosse, B. et al. 2018. A Serendipitous MWA Search for Narrowband Signals from 'Oumuamua. Astrophysical Journal. 857 (1): Article ID 11.
    Source Title
    Astrophysical Journal
    DOI
    10.3847/1538-4357/aab359
    ISSN
    0004-637X
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/67712
    Collection
    • Curtin Research Publications
    Abstract

    We examine data from the Murchison Widefield Array (MWA) in the frequency range 72-102 MHz for a field of view that serendipitously contained the interstellar object 'Oumuamua on 2017 November 28. Observations took place with a time resolution of 0.5 s and a freq uency resolution of 10 kHz. Based on the interesting but highly unlikely suggestion that 'Oumuamua is an interstellar spacecraft, due to some unusual orbital and morphological characteristics, we examine our data for signals that might indicate the presence of intelligent life associated with 'Oumuamua. We searched our radio data for (1) impulsive narrowband signals, (2) persistent narrowband signals, and (3) impulsive broadband signals. We found no such signals with nonterrestrial origins and make estimates of the upper limits on equivalent isotropic radiated power (EIRP) for these three cases of approximately 7 kW, 840 W, and 100 kW, respectively. These transmitter powers are well within the capabilities of human technologies, and are therefore plausible for alien civilizations. While the chances of positive detection in any given search for extraterrestrial intelligence (SETI) experiment are vanishingly small, the characteristics of new generation telescopes such as the MWA (and, in the future, the Square Kilometre Array) make certain classes of SETI experiments easy, or even a trivial by-product of astrophysical observations. This means that the future costs of SETI experiments are very low, allowing large target lists to partially balance the low probability of a positive detection.

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