Zobrazeno 1 - 10
of 28
pro vyhledávání: '"K. M. B. Asad"'
Autor:
K S Trehaeven, V Parekh, N Oozeer, B Hugo, O Smirnov, G Bernardi, K Knowles, C Tasse, K M B Asad, S Giacintucci
Radio mini-halos are clouds of diffuse, low surface brightness synchrotron emission that surround the Brightest Cluster Galaxy (BCG) in massive cool-core galaxy clusters. In this paper, we use third generation calibration (3GC), also called direction
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::642cf57142001a27a5ba8eb950bdb5ab
Autor:
I. Heywood, I. Rammala, F. Camilo, W. D. Cotton, F. Yusef-Zadeh, T. D. Abbott, R. M. Adam, G. Adams, M. A. Aldera, K. M. B. Asad, E. F. Bauermeister, T. G. H. Bennett, H. L. Bester, W. A. Bode, D. H. Botha, A. G. Botha, L. R. S. Brederode, S. Buchner, J. P. Burger, T. Cheetham, D. I. L. de Villiers, M. A. Dikgale-Mahlakoana, L. J. du Toit, S. W. P. Esterhuyse, B. L. Fanaroff, S. February, D. J. Fourie, B. S. Frank, R. R. G. Gamatham, M. Geyer, S. Goedhart, M. Gouws, S. C. Gumede, M. J. Hlakola, A. Hokwana, S. W. Hoosen, J. M. G. Horrell, B. Hugo, A. I. Isaacson, G. I. G. Józsa, J. L. Jonas, A. F. Joubert, R. P. M. Julie, F. B. Kapp, J. S. Kenyon, P. P. A. Kotzé, N. Kriek, H. Kriel, V. K. Krishnan, R. Lehmensiek, D. Liebenberg, R. T. Lord, B. M. Lunsky, K. Madisa, L. G. Magnus, O. Mahgoub, A. Makhaba, S. Makhathini, J. A. Malan, J. R. Manley, S. J. Marais, A. Martens, T. Mauch, B. C. Merry, R. P. Millenaar, N. Mnyandu, O. J. Mokone, T. E. Monama, M. C. Mphego, W. S. New, B. Ngcebetsha, K. J. Ngoasheng, M. T. Ockards, N. Oozeer, A. J. Otto, S. S. Passmoor, A. A. Patel, A. Peens-Hough, S. J. Perkins, A. J. T. Ramaila, N. M. R. Ramanujam, Z. R. Ramudzuli, S. M. Ratcliffe, A. Robyntjies, S. Salie, N. Sambu, C. T. G. Schollar, L. C. Schwardt, R. L. Schwartz, M. Serylak, R. Siebrits, S. K. Sirothia, M. Slabber, O. M. Smirnov, L. Sofeya, B. Taljaard, C. Tasse, A. J. Tiplady, O. Toruvanda, S. N. Twum, T. J. van Balla, A. van der Byl, C. van der Merwe, V. Van Tonder, R. Van Wyk, A. J. Venter, M. Venter, B. H. Wallace, M. G. Welz, L. P. Williams, B. Xaia
The inner $\sim$200 pc region of the Galaxy contains a 4 million M$_{\odot}$ supermassive black hole (SMBH), significant quantities of molecular gas, and star formation and cosmic ray energy densities that are roughly two orders of magnitude higher t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28fe7ee4d1e1621d3fd4322adc908210
Autor:
Abhik Ghosh, I. T. Iliev, Sambit K. Giri, Sarod Yatawatta, Léon V. E. Koopmans, A. R. Offringa, Vibor Jelić, M. B. Silva, Rajesh Mondal, Maaijke Mevius, Raghunath Ghara, Saleem Zaroubi, Joop Schaye, Garrelt Mellema, Florent Mertens, B. K. Gehlot, Simon Gazagnes, R. Kooistra, V. N. Pandey, K. M. B. Asad, B. Ciardi, Emma Chapman
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
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
https://doi.org/10.1093/mnras/staa487
Autor:
K. M. B. Asad, Florent Mertens, A. R. Offringa, B. K. Gehlot, Luitje Koopmans, I. T. Iliev, Maaijke Mevius, Sambit K. Giri, Sarod Yatawatta, B. Ciardi, Abhik Ghosh, Rajesh Mondal, Vishambhar Pandey, Michiel A. Brentjens, A. M. Sardarabadi, H. Gan, Raghunath Ghara, R. Kooistra, Simon Gazagnes, Joop Schaye, Vibor Jelić, Harish Vedantham, Garrelt Mellema, Saleem Zaroubi, M. B. Silva, Emma Chapman
Publikováno v:
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 493(2), 1662-1685
Monthly Notices of the Royal Astronomical Society, 493(2), 1662-1685
A new upper limit on the 21 cm signal power spectrum at a redshift of z ≈ 9.1 is presented, based on 141 h of data obtained with the Low-Frequency Array (LOFAR). The analysis includes significant improvements in spectrally smooth gain-calibration,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ac4e4eb4cafd3c7d4919e8c1933d868d
http://fulir.irb.hr/5324/1/staa327.pdf
http://fulir.irb.hr/5324/1/staa327.pdf
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 481:2694-2710
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
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
Publikováno v:
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 476(3), 3051-3062. Oxford University Press
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
Autor:
K. M. B. Asad, Oleg Smirnov, M. de Villiers, Dirk I. L. de Villiers, Justin L. Jonas, Robert Lehmensiek
Publikováno v:
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting.
A comparison of measured and simulated primary beam patterns of the MeerKAT radio telescope is presented. It is shown that the measured data, after removing noise through aperture projection, displays some asymmetry across the apparent symmetry plane
Autor:
M. S. de Villiers, K. Iheanetu, Kshitij Thorat, S. Makhathini, Dirk I. L. de Villiers, Oleg Smirnov, Mario G. Santos, K. M. B. Asad, Justin L. Jonas, Robert Lehmensiek, Gyula I. G. Józsa, J.N. Girard, T. Ansah-Narh, S. K. Sirothia, B. Hugo
After a decade of design and construction, South Africa's SKA-MID precursor MeerKAT has begun its science operations. To make full use of the widefield capability of the array, it is imperative that we have an accurate model of the primary beam of it
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::51c6461e821effcfe0dc9cf56f05ed9a
http://arxiv.org/abs/1904.07155
http://arxiv.org/abs/1904.07155
Autor:
K. M. B. Asad, T. E. Monama, E. F. Bauermeister, Bruce Merry, O. Toruvanda, S. J. Marais, B. M. Lunsky, L. C. Schwardt, H. Bester, H. Kriel, M. Geyer, S. February, B. H. Wallace, M. Serylak, S. N. Twum, N. Kriek, B. Taljaard, M. A. Dikgale-Mahlakoana, W. S. New, K. Madisa, R. M. Adam, Oleg Smirnov, S. Fataar, R. Millenaar, Z. R. Ramudzuli, S. Gounden, I. P. Theron, K. J. Ngoasheng, Z. B. Brits, J. Horrell, G. Stone, D. H. Botha, T. W. Kusel, B. Xaia, M. J. Hlakola, B. S. Frank, S. W. P. Esterhuyse, Jason Manley, James J. Condon, A. Robyntjies, J. A. Malan, Gyula I. G. Józsa, A. A. Patel, R. R. G. Gamatham, Justin L. Jonas, S. C. Gumede, R. Siebrits, A. J. T. Ramaila, M. T. O. Ockards, Nadeem Oozeer, J. P. Burger, A. Loots, M. A. Aldera, L. G. Magnus, R. P. M. Julie, B. L. Fanaroff, G. Fadana, Robert Lehmensiek, A. J. Otto, A. van der Byl, T. Mauch, T. J. van Balla, S. K. Sirothia, L. Sofeya, P. P. A. Kotzé, N. Mnyandu, M. S. de Villiers, T. Cheetham, J. S. Kenyon, R. Renil, J. M. Chalmers, Ian Heywood, A. M. Matthews, L. Richter, F. Kapp, S. Salie, A. R. Isaacson, I. P. T. Moeng, A. Peens-Hough, R. T. Lord, Dirk I. L. de Villiers, W. D. Cotton, V. A. Kasper, J. P. L. Main, Sharmila Goedhart, B. Hugo, L. P. Williams, C. Tasse, L. R. S. Brederode, A. Martens, M. G. Welz, S. J. Buchner, T. D. Abbott, Simon Perkins, M. C. Mphego, C.G. Van der Merwe, V. Van Tonder, C. T. G. Schollar, L. J. du Toit, Fernando Camilo, O. J. Mokone, A. J. Tiplady, T. G. H. Bennett, B. Ngcebetsha
We present the confusion-limited 1.28 GHz MeerKAT DEEP2 image covering one $\approx 68'$ FWHM primary beam area with $7.6''$ FWHM resolution and $0.55 \pm 0.01$ $\mu$Jy/beam rms noise. Its J2000 center position $\alpha=04^h 13^m 26.4^s$, $\delta=-80^
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dac0f4901d67488fe8636456c0bcfad2