Recent Publications

  • “The first power spectrum limit on the 21-cm signal of neutral hydrogen during
    the Cosmic Dawn at $z=20-25$ from LOFAR”, Gehlot, B. K., Mertens, F. G.,
    Koopmans, L. V. E., Brentjens, M. A., Zaroubi, S., Ciardi, B., Ghosh, A., Hatef,
    M., Iliev, I. T., Jelić, V., Kooistra, R., Krause, F., Mitra, M., Mevius, M.,
    Mellema, G., Offringa, A. R., Pandey, V. N., Silva, M. B., Schaye, J.,
    Sardarabadi, A. M., Vedantham, H. K. & Yatawatta, S. (2018), ArXiv e-prints,
    arXiv:1809.06661.
  • “Quantifying Suppression of the Cosmological 21-cm Signal due to Direction
    Dependent Gain Calibration in Radio Interferometers”, Mouri Sardarabadi, A. &
    Koopmans, L. V. E. (2018), ArXiv e-prints, arXiv:1809.03755.
  • “Statistical 21-cm signal separation via Gaussian Process Regression analysis”,
    Mertens, F. G., Ghosh, A. & Koopmans, L. V. E. (2018), Monthly Notices of the
    Royal Astronomical Society, 478, 3640.
  • “Wide-field LOFAR-LBA power-spectra analyses: impact of calibration,
    polarization leakage, and ionosphere”, Gehlot, B. K., Koopmans, L. V. E., de
    Bruyn, A. G., Zaroubi, S., Brentjens, M. A., Asad, K. M. B., Hatef, M., Jelić,
    V., Mevius, M., Offringa, A. R., Pandey, V. N. & Yatawatta, S. (2018), Monthly
    Notices of the Royal Astronomical Society, 478, 1484.
  • “Polarization leakage in epoch of reionization windows – III. Wide-field effects
    of narrow-field arrays”, Asad, K. M. B., Koopmans, L. V. E., Jelić, V., de
    Bruyn, A. G., Pandey, V. N. & Gehlot, B. K. (2018), Monthly Notices of the Royal
    Astronomical Society, 476, 3051.
  • “Robust Foregrounds Removal for 21-cm Experiments”, Mertens, F., Ghosh, A. &
    Koopmans, L. V. E. (2018), Peering towards Cosmic Dawn, 333, 284.
  • “Wide-field LOFAR-LBA power-spectra analyses: Impact of calibration,
    polarization leakage and ionosphere”, Gehlot, B. K. & Koopmans, L. V. E. (2018),
    Peering towards Cosmic Dawn, 333, 106.
  • “Current Status of the LOFAR EoR Key Science Project”, Koopmans, L. V. E. &
    LOFAR EoR KSP Team (2018), Peering towards Cosmic Dawn, 333, 71.
  • “Constrained Least Squares for Extended Complex Factor Analysis”, Mouri
    Sardarabadi, A., van der Veen, A.-J. & Koopmans, L. V. E. (2018), ArXiv
    e-prints, arXiv:1804.00430.
  • “Data multiplexing in radio interferometric calibration”, Yatawatta, S., Diblen,
    F., Spreeuw, H. & Koopmans, L. V. E. (2018), Monthly Notices of the Royal
    Astronomical Society, 475, 708.
  • “Deconvolving the wedge: maximum-likelihood power spectra via spherical-wave
    visibility modelling”, Ghosh, A., Mertens, F. G. & Koopmans, L. V. E. (2018),
    Monthly Notices of the Royal Astronomical Society, 474, 4552.
  • “Efficient Calibration of Radio Interferometers Using Block LDU Decomposition”,
    Mouri Sardarabadi, A., van der Veen, A.-J. & Koopmans, L. V. E. (2018), ArXiv
    e-prints, arXiv:1803.05707.
  • “Recovering the H II region size statistics from 21-cm tomography”, Kakiichi,
    K., Majumdar, S., Mellema, G., Ciardi, B., Dixon, K. L., Iliev, I. T., Jelić,
    V., Koopmans, L. V. E., Zaroubi, S. & Busch, P. (2017), Monthly Notices of the
    Royal Astronomical Society, 471, 1936.
  • “Spectral performance of SKA Log-periodic Antennas I: mitigating spectral
    artefacts in SKA1-LOW 21 cm cosmology experiments”, de Lera Acedo, E., Trott, C.
    M., Wayth, R. B., Fagnoni, N., Bernardi, G., Wakley, B., Koopmans, L. V. E.,
    Faulkner, A. J. & bij de Vaate, J. G. (2017), Monthly Notices of the Royal
    Astronomical Society, 469, 2662.
  • “Upper Limits on the 21 cm Epoch of Reionization Power Spectrum from One Night
    with LOFAR”, Patil, A. H., Yatawatta, S., Koopmans, L. V. E., de Bruyn, A. G.,
    Brentjens, M. A., Zaroubi, S., Asad, K. M. B., Hatef, M., Jelić, V., Mevius, M.,
    Offringa, A. R., Pandey, V. N., Vedantham, H., Abdalla, F. B., Brouw, W. N.,
    Chapman, E., Ciardi, B., Gehlot, B. K., Ghosh, A., Harker, G., Iliev, I. T.,
    Kakiichi, K., Majumdar, S., Mellema, G., Silva, M. B., Schaye, J., Vrbanec, D. &
    Wijnholds, S. J. (2017), The Astrophysical Journal, 838, 65.
  • “Systematic biases in low-frequency radio interferometric data due to
    calibration: the LOFAR-EoR case”, Patil, A. H., Yatawatta, S., Zaroubi, S.,
    Koopmans, L. V. E., de Bruyn, A. G., Jelić, V., Ciardi, B., Iliev, I. T.,
    Mevius, M., Pandey, V. N. & Gehlot, B. K. (2016), Monthly Notices of the Royal
    Astronomical Society, 463, 4317.
  • “Polarization leakage in epoch of reionization windows – II. Primary beam model
    and direction-dependent calibration”, Asad, K. M. B., Koopmans, L. V. E., Jelić,
    V., Ghosh, A., Abdalla, F. B., Brentjens, M. A., de Bruyn, A. G., Ciardi, B.,
    Gehlot, B. K., Iliev, I. T., Mevius, M., Pandey, V. N., Yatawatta, S. & Zaroubi,
    S. (2016), Monthly Notices of the Royal Astronomical Society, 462, 4482.
  • “Probing ionospheric structures using the LOFAR radio telescope”, Mevius, M.,
    van der Tol, S., Pandey, V. N., Vedantham, H. K., Brentjens, M. A., de Bruyn, A.
    G., Abdalla, F. B., Asad, K. M. B., Bregman, J. D., Brouw, W. N., Bus, S.,
    Chapman, E., Ciardi, B., Fernandez, E. R., Ghosh, A., Harker, G., Iliev, I. T.,
    Jelić, V., Kazemi, S., Koopmans, L. V. E., Noordam, J. E., Offringa, A. R.,
    Patil, A. H., van Weeren, R. J., Wijnholds, S., Yatawatta, S. & Zaroubi, S.
    (2016), Radio Science, 51, 927.