Výsledky vyhledávání - "V. N., Pandey"

Degree-scale galactic radio emission at 122 MHz around the North Celestial Pole with LOFAR-AARTFAAC

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

Publikováno v: Astronomy & Astrophysics, 662:A97. EDP Sciences
Astronomy & Astrophysics, 662:A97
Astronomy and astrophysics, 662:A97. EDP Sciences

Aims: Contamination from bright diffuse Galactic thermal and non-thermal radio emission poses crucial challenges in experiments aiming to measure the 21-cm signal of neutral hydrogen from the Cosmic Dawn and Epoch of Reionization. If not included in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::12aaa5ba5ed2e35717a5c31016b90443
https://hdl.handle.net/1887/3561903

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

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

Publikováno v: Astronomy & astrophysics, 669:A20. EDP Sciences

Context. Detecting the 21 cm signal from the epoch of reionisation (EoR) has been highly challenging due to the strong astrophysical foregrounds, ionospheric effects, radio frequency interference (RFI), and instrumental effects. Better characterisati

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::afc969bb06d552962f58d3d3b6a34d5c
https://doi.org/10.1051/0004-6361/202244316

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Akademický článek

The Pharmacological and Therapeutic Activities of Canavalia gladiata (Jacq.) DC.

Autor: Mrinalini, Pal, V. S., Pandey, Ajay, Dhawal, Prachi, Upadhyay, Vartika, Ratanajay, Sharma, B. N., Singh, Ishwar, Das, V. N., Pandey

Publikováno v: Journal of Drug Delivery & Therapeutics; 2022 Supplement, Vol. 12, p208-216, 9p

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

Autor: F. Mertens, Abhik Ghosh, Benedetta Ciardi, B. K. Gehlot, Saleem Zaroubi, Sarod Yatawatta, Maaijke Mevius, Garrelt Mellema, H. Gan, A. R. Offringa, Léon V. E. Koopmans, Sambit K. Giri, Ilian T. Iliev, V. N. Pandey, Michiel A. Brentjens, Emma Chapman, Raghunath Ghara

Publikováno v: Mon.Not.Roy.Astron.Soc.
Mon.Not.Roy.Astron.Soc., 2021, ⟨10.1093/mnras/stab3233⟩
Monthly Notices of the Royal Astronomical Society, 509(3), 3693-3702. Oxford University Press

We investigate systematic effects in direction dependent gain calibration in the context of the Low-Frequency Array (LOFAR) 21-cm Epoch of Reionization (EoR) experiment. The LOFAR EoR Key Science Project aims to detect the 21-cm signal of neutral hyd

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::653e98fc07d668bfa5b97710dc64c879

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Constraining the intergalactic medium at z≈9.1 using LOFAR Epoch of Reionization observations

Publikováno v: Mon.Not.Roy.Astron.Soc.
Mon.Not.Roy.Astron.Soc., 2020, 493 (4), pp.4728-4748. ⟨10.1093/mnras/staa487⟩
Mon.Not.Roy.Astron.Soc., 2020, 493 (4), pp.4728-4747. ⟨10.1093/mnras/staa487⟩
Monthly Notices of the Royal Astronomical Society, 493(4), 4728-4747
Monthly Notices of the Royal Astronomical Society, 493(4), 4728-4747. Oxford University Press
Monthly notices of the Royal Astronomical Society

We derive constraints on the thermal and ionization states of the intergalactic medium (IGM) at redshift $\approx$ 9.1 using new upper limits on the 21-cm power spectrum measured by the LOFAR radio-telescope and a prior on the ionized fraction at tha

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::80e309f24f995bd4e5fea1f3e6d349b5
https://doi.org/10.1093/mnras/staa487

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Cassiopeia A, Cygnus A, Taurus A, and Virgo A at ultra-low radio frequencies

Autor: F. de Gasperin, J. Vink, J. P. McKean, A. Asgekar, I. Avruch, M. J. Bentum, R. Blaauw, A. Bonafede, J. W. Broderick, M. Brüggen, F. Breitling, W. N. Brouw, H. R. Butcher, B. Ciardi, V. Cuciti, M. de Vos, S. Duscha, J. Eislöffel, D. Engels, R. A. Fallows, T. M. O. Franzen, M. A. Garrett, A. W. Gunst, J. Hörandel, G. Heald, M. Hoeft, M. Iacobelli, L. V. E. Koopmans, A. Krankowski, P. Maat, G. Mann, M. Mevius, G. Miley, R. Morganti, A. Nelles, M. J. Norden, A. R. Offringa, E. Orrú, H. Paas, V. N. Pandey, M. Pandey-Pommier, R. Pekal, R. Pizzo, W. Reich, A. Rowlinson, H. J. A. Rottgering, D. J. Schwarz, A. Shulevski, O. Smirnov, C. Sobey, M. Soida, M. Steinmetz, M. Tagger, M. C. Toribio, A. van Ardenne, A. J. van der Horst, M. P. van Haarlem, R. J. van Weeren, C. Vocks, O. Wucknitz, P. Zarka, P. Zucca

Publikováno v: Astronomy & Astrophysics
Astronomy & astrophysics, 635. EDP Sciences
Astronomy and Astrophysics
Astronomy and Astrophysics, EDP Sciences, 2020, 635, pp.A150. ⟨10.1051/0004-6361/201936844⟩
Astronomy and astrophysics 635, A150 (2020). doi:10.1051/0004-6361/201936844
Astronomy & Astrophysics, 635, pp. 1-7
Astronomy & Astrophysics, 635, A150
Astronomy & Astrophysics, 635:A150. EDP Sciences
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2020, 635, pp.A150. ⟨10.1051/0004-6361/201936844⟩
Astronomy & Astrophysics, 635, 1-7

The four persistent radio sources in the northern sky with the highest flux density at metre wavelengths are Cassiopeia A, Cygnus A, Taurus A, and Virgo A; collectively they are called the A-team. Their flux densities at ultra-low frequencies (

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::612dc95fc83c60d515ae5d62db17b118
https://pub.uni-bielefeld.de/record/2942903

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Wide-field LOFAR-LBA power-spectra analyses

Autor: Maaijke Mevius, Michiel A. Brentjens, Sarod Yatawatta, B. K. Gehlot, V. N. Pandey, M. Hatef, Léon V. E. Koopmans, A. R. Offringa, A. G. de Bruyn, Saleem Zaroubi, Vibor Jelić, K. M. B. Asad

Publikováno v: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 478(2), 1484-1501. Oxford University Press

Contamination due to foregrounds (Galactic and Extra-galactic), calibration errors and ionospheric effects pose major challenges in detection of the cosmic 21 cm signal in various Epoch of Reionization (EoR) experiments. We present the results of a p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ff89f8c2273613455407e12432fa585
https://research.rug.nl/en/publications/617223ee-20bd-4f79-a206-63a99b4c29cb

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Polarization leakage in epoch of reionization windows - III. Wide-field effects of narrow-field arrays

Autor: K. M. B. Asad, Léon V. E. Koopmans, V. N. Pandey, A. G. de Bruyn, Vibor Jelić, B. K. Gehlot

Publikováno v: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 476(3), 3051-3062. Oxford University Press

Leakage of polarized Galactic diffuse emission into total intensity can potentially mimic the 21-cm signal coming from the epoch of reionization (EoR), as both of them might have fluctuating spectral structure. Although we are sensitive to the EoR si

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8877a9443d9ec198306f1e39f28b2a00
https://doi.org/10.1093/mnras/sty258

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