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    The angular power spectrum measurement of the Galactic synchrotron emission in two fields of the TGSS survey

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    Open access
    Authors
    Choudhuri, S.
    Bharadwaj, S.
    Ali, S.
    Roy, N.
    Intema, Hubertus
    Ghosh, A.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Choudhuri, S. and Bharadwaj, S. and Ali, S. and Roy, N. and Intema, H. and Ghosh, A. 2017. The angular power spectrum measurement of the Galactic synchrotron emission in two fields of the TGSS survey. Monthly Notices of the Royal Astronomical Society. 470 (1): pp. L11-L15.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnrasl/slx066
    ISSN
    0035-8711
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/74873
    Collection
    • Curtin Research Publications
    Abstract

    Characterizing the diffuse Galactic synchrotron emission at arcminute angular scales is needed to reliably remove foregrounds in cosmological 21-cm measurements. The study of this emission is also interesting in its own right. Here, we quantify the fluctuations of the diffuse Galactic synchrotron emission using visibility data for two of the fields observed by the TIFR GMRT Sky Survey. We have used the 2D Tapered Gridded Estimator to estimate the angular power spectrum (Cℓ) from the visibilities. We find that the sky signal, after subtracting the point sources, is likely dominated by the diffuse Galactic synchrotron radiation across the angular multipole range 240 ≤ ℓ ≲ 500. We present a power-law fit, Cℓ=A×(1000l)β⁠, to the measured Cℓ over this ℓ range. We find that (A, β) have values (356 ± 109 mK2, 2.8 ± 0.3) and (54 ± 26 mK2, 2.2 ± 0.4) in the two fields. For the second field, however, there is indication of a significant residual point source contribution and for this field we interpret the measured Cℓ as an upper limit for the diffuse Galactic synchrotron emission. While in both fields the slopes are consistent with earlier measurements, the second field appears to have an amplitude that is considerably smaller compared to similar measurements in other parts of the sky.

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