Spectral modelling of Cygnus A between 110 and 250 MHz. Impact on the LOFAR 21-cm signal power spectrum

Authors: Ceccotti, E., Offringa, A. R., Koopmans, L. V. E., Mertens, F. G., Mevius, M., Acharya, A., Brackenhoff, S. A., Ciardi, B., Gehlot, B. K., Ghara, R., Chege, J. K., Ghosh, S., Höfer, C., Hothi, I., Iliev, I. T., McKean, J. P., Munshi, S., Zaroubi, S.

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2502.18459

Mitigating calibration errors from mutual coupling with time-domain filtering of 21 cm cosmological radio observations

Authors: Charles, N., Kern, N. S., Pascua, R., Bernardi, G., Bester, L., Smirnov, O., Acedo, E. d. L., Abdurashidova, Z., Adams, T., Aguirre, J. E., Baartman, R., Beardsley, A. P., Berkhout, L. M., Billings, T. S., Bowman, J. D., Bull, P., Burba, J., Byrne, R., Carey, S., Chen, K., Choudhuri, S., Cox, T., DeBoer, D. R., Dexter, M., Dillon, J. S., Dynes, S., Eksteen, N., Ely, J., Ewall-Wice, A., Fritz, R., Furlanetto, S. R., Gale-Sides, K., Garsden, H., Gehlot, B. K., Ghosh, A., Gorce, A., Gorthi, D., Halday, Z., Hazelton, B. J., Hewitt, J. N., Hickish, J., Huang, T., Jacobs, D. C., Josaitis, A., Kerrigan, J., Kittiwisit, P., Kolopanis, M., Lanman, A., Liu, A., Ma, Y. -Z., MacMahon, D. H. E., Malan, L., Malgas, K., Malgas, C., Marero, B., Martinot, Z. E., McBride, L., Mesinger, A., Mohamed-Hinds, N., Molewa, M., Morales, M. F., Murray, S., Nikolic, B., Nuwegeld, H., Parsons, A. R., Patra, N., Plante, P. L., Qin, Y., Rath, E., Razavi-Ghods, N., Riley, D., Robnett, J., Rosie, K., Santos, M. G., Sims, P., Singh, S., Storer, D., Swarts, H., Tan, J., Wilensky, M. J., Williams, P. K. G., Wyngaarden, P. v., Zheng, H.

Subject Terms: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2407.20923

Ionospheric contributions to the excess power in high-redshift 21-cm power-spectrum observations with LOFAR

Authors: Brackenhoff, S. A., Mevius, M., Koopmans, L. V. E., Offringa, A., Ceccotti, E., Chege, J. K., Gehlot, B. K., Ghosh, S., Höfer, C., Mertens, F. G., Munshi, S., Zaroubi, S.

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2407.20220

The impact of lossy data compression on the power spectrum of the high redshift 21-cm signal with LOFAR

Authors: Chege, J. K., Koopmans, L. V. E., Offringa, A. R., Gehlot, B. K., Brackenhoff, S. A., Ceccotti, E., Ghosh, S., Höfer, C., Mertens, F. G., Mevius, M., Munshi, S.

Source: A&A 692, A211 (2024)

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2407.11557

Beyond the horizon: Quantifying the full sky foreground wedge in the cylindrical power spectrum

Authors: Munshi, S., Mertens, F. G., Koopmans, L. V. E., Offringa, A. R., Ceccotti, E., Brackenhoff, S. A., Chege, J. K., Gehlot, B. K., Ghosh, S., Höfer, C., Mevius, M.

Source: A&A 693, A276 (2025)

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2407.10686

Investigating Mutual Coupling in the Hydrogen Epoch of Reionization Array and Mitigating its Effects on the 21-cm Power Spectrum

Authors: Rath, E., Pascua, R., Josaitis, A. T., Ewall-Wice, A., Fagnoni, N., Acedo, E. de Lera, Martinot, Z. E., Abdurashidova, Z., Adams, T., Aguirre, J. E., Baartman, R., Beardsley, A. P., Berkhout, L. M., Bernardi, G., Billings, T. S., Bowman, J. D., Bull, P., Burba, J., Byrne, R., Carey, S., Chen, K. -F., Choudhuri, S., Cox, T., DeBoer, D. R., Dexter, M., Dillon, J. S., Dynes, S., Eksteen, N., Ely, J., Fritz, R., Furlanetto, S. R., Gale-Sides, K., Garsden, H., Gehlot, B. K., Ghosh, A., Gorce, A., Gorthi, D., Halday, Z., Hazelton, B. J., Hewitt, J. N., Hickish, J., Huang, T., Jacobs, D. C., Kern, N. S., Kerrigan, J., Kittiwisit, P., Kolopanis, M., Lanman, A., Liu, A., Ma, Y. -Z., MacMahon, D. H. E., Malan, L., Malgas, C., Malgas, K., Marero, B., McBride, L., Mesinger, A., Mohamed-Hinds, N., Molewa, M., Morales, M. F., Murray, S. G., Nikolic, B., Nuwegeld, H., Parsons, A. R., Patra, N., La Plante, P., Qin, Y., Razavi-Ghods, N., Riley, D., Robnett, J., Rosie, K., Santos, M. G., Sims, P., Singh, S., Storer, D., Swarts, H., Tan, J., Wilensky, M. J., Williams, P. K. G., van Wyngaarden, P., Zheng, H.

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2406.08549

First upper limits on the 21 cm signal power spectrum from cosmic dawn from one night of observations with NenuFAR

Authors: Munshi, S., Mertens, F. G., Koopmans, L. V. E., Offringa, A. R., Semelin, B., Aubert, D., Barkana, R., Bracco, A., Brackenhoff, S. A., Cecconi, B., Ceccotti, E., Corbel, S., Fialkov, A., Gehlot, B. K., Ghara, R., Girard, J. N., Grießmeier, J. M., Höfer, C., Hothi, I., Mériot, R., Mevius, M., Ocvirk, P., Shaw, A. K., Theureau, G., Yatawatta, S., Zarka, P., Zaroubi, S.

Source: A&A 681, A62 (2024)

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2311.05364

Transient RFI environment of LOFAR-LBA at 72-75 MHz: Impact on ultra-widefield AARTFAAC Cosmic Explorer observations of the redshifted 21-cm signal

Authors: Gehlot, B. K., Koopmans, L. V. E., Brackenhoff, S. A., Ceccotti, E., Ghosh, S., Höfer, C., Mertens, F. G., Mevius, M., Munshi, S., Offringa, A. R., Pandey, V. N., Rowlinson, A., Shulevski, A., Wijers, R. A. M. J., Yatawatta, S., Zaroubi, S.

Source: A&A 681, A71 (2024)

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2311.03023

A novel radio imaging method for physical spectral index modelling

Authors: Ceccotti, E., Offringa, A. R., Koopmans, L. V. E., Timmerman, R., Brackenhoff, S. A., Gehlot, B. K., Mertens, F. G., Munshi, S., Pandey, V. N., van Weeren, R. J., Yatawatta, S., Zaroubi, S.

Subject Terms: Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2308.07306

Diffuse Sources, Clustering and the Excess Anisotropy of the Radio Synchrotron Background

Authors: Cowie, F. J., Offringa, A. R., Gehlot, B. K., Singal, J., Heston, S., Horiuchi, S., Lucero, D. M.

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2306.00829

Assessing the impact of two independent direction-dependent calibration algorithms on the LOFAR 21-cm signal power spectrum

Authors: Gan, H., Mertens, F. G., Koopmans, L. V. E., Offringa, A. R., Mevius, M., Pandey, V. N., Brackenhoff, S. A., Ceccotti, E., Ciardi, B., Gehlot, B. K., Ghara, R., Giri, S. K., Iliev, I. T., Munshi, S.

Source: A&A 669, A20 (2023)

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2209.07854

Statistical analysis of the causes of excess variance in the 21 cm signal power spectra obtained with the Low-Frequency Array

Authors: Gan, H., Koopmans, L. V. E, Mertens, F. G., Mevius, M., Offringa, A. R., Ciardi, B., Gehlot, B. K., Ghara, R., Ghosh, A., Giri, S. K., Iliev, I. T., Mellema, G., Pandey, V. N., Zaroubi, S.

Source: A&A 663, A9 (2022)

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2203.02345

Degree-Scale Galactic Radio Emission at 122 MHz around the North Celestial Pole with LOFAR-AARTFAAC

Authors: Gehlot, B. K., Koopmans, L. V. E., Offringa, A. R., Gan, H., Ghara, R., Giri, S. K., Kuiack, M., Mertens, F. G., Mevius, M., Mondal, R., Pandey, V. N., Shulevski, A., Wijers, R. A. M. J., Yatawatta, S.

Source: A&A 662, A97 (2022)

Subject Terms: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2112.00721

A numerical study of 21-cm signal suppression and noise increase in direction-dependent calibration of LOFAR data

Authors: Mevius, M., Mertens, F., Koopmans, L. V. E., Offringa, A. R., Yatawatta, S., Brentjens, M. A., Chapman, E., Ciardi, B., Gan, H., Gehlot, B. K., Ghara, R., Ghosh, A., Giri, S. K., Iliev, I. T., Mellema, G., Pandey, V. N., Zaroubi, S.

Source: MNRAS 2021

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2111.02537

Characterization of the AARTFAAC-12 aperture array: radio source counts at 42 and 61 MHz

Authors: Shulevski, A., Franzen, T. M. O., Williams, W. L., Vernstrom, T., Gehlot, B. K., Kuiack, M., Wijers, R. A. M. J.

Subject Terms: Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2103.15160

Comparing Foreground Removal Techniques for Recovery of the LOFAR-EoR 21cm Power Spectrum

Authors: Hothi, Ian, Chapman, Emma, Pritchard, Jonathan R., Mertens, F. G., Koopmans, L. V. E, Ciardi, B., Gehlot, B. K., Ghara, R., Ghosh, A., Giri, S. K., Iliev, I. T., Jelić, V., Zaroubi, S.

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2011.01284

The AARTFAAC Cosmic Explorer: observations of the 21-cm power spectrum in the EDGES absorption trough

Authors: Gehlot, B. K., Mertens, F. G., Koopmans, L. V. E., Offringa, A. R., Shulevski, A., Mevius, M., Brentjens, M. A., Kuiack, M., Pandey, V. N., Rowlinson, A., Sardarabadi, A. M., Vedantham, H. K., Wijers, R. A. M. J., Yatawatta, S., Zaroubi, S.

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

Access URL: http://arxiv.org/abs/2010.02269

Tight Constraints on the Excess Radio Background at $z = 9.1$ from LOFAR

Authors: Mondal, R., Fialkov, A., Fling, C., Iliev, I. T., Barkana, R., Ciardi, B., Mellema, G., Zaroubi, S., Koopmans, L. V. E, Mertens, F. G., Gehlot, B. K., Ghara, R., Ghosh, A., Giri, S. K., Offringa, A., Pandey, V. N.

Source: Monthly Notices of the Royal Astronomical Society, Volume 498, Issue 3, November 2020, Pages 4178-4191

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2004.00678

Constraining the intergalactic medium at $z\approx$ 9.1 using LOFAR Epoch of Reionization observations

Authors: Ghara, R., Giri, S. K., Mellema, G., Ciardi, B., Zaroubi, S., Iliev, I. T., Koopmans, L. V. E., Chapman, E., Gazagnes, S., Gehlot, B. K., Ghosh, A., Jelic, V., Mertens, F. G., Mondal, R., Schaye, J., Silva, M. B., Asad, K. M. B., Kooistra, R., Mevius, M., Offringa, A. R., Pandey, V. N., Yatawatta, S.

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies

Access URL: http://arxiv.org/abs/2002.07195

Improved upper limits on the 21-cm signal power spectrum of neutral hydrogen at $\boldsymbol{z \approx 9.1}$ from LOFAR

Authors: Mertens, F. G., Mevius, M., Koopmans, L. V. E, Offringa, A. R., Mellema, G., Zaroubi, S., Brentjens, M. A., Gan, H., Gehlot, B. K., Pandey, V. N., Sardarabadi, A. M., Vedantham, H. K., Yatawatta, S., Asad, K. M. B., Ciardi, B., Chapman, E., Gazagnes, S., Ghara, R., Ghosh, A., Giri, S. K., Iliev, I. T., Jelić, V., Kooistra, R., Mondal, R., Schaye, J., Silva, M. B.

Subject Terms: Astrophysics - Cosmology and Nongalactic Astrophysics

Access URL: http://arxiv.org/abs/2002.07196