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Pregled bibliografske jedinice broj: 766724

Lunar occultation of the diffuse radio sky: LOFAR measurements between 35 and 80 MHz

Vedantham, H.K.; Koopmans, L.V.E.; de Bruyn, A.G.; Wijnholds, S.J.; Brentjens, M.; Abdalla, F.B.; Asad, K.M.B.; Bernardi, G.; Bus, S.; Chapman, E. et al.
Lunar occultation of the diffuse radio sky: LOFAR measurements between 35 and 80 MHz // Monthly notices of the Royal Astronomical Society, 450 (2015), 3; 2291-2305 doi:10.1093/mnras/stv746 (međunarodna recenzija, članak, znanstveni)

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Naslov
Lunar occultation of the diffuse radio sky: LOFAR measurements between 35 and 80 MHz

Autori
Vedantham, H.K. ; Koopmans, L.V.E. ; de Bruyn, A.G. ; Wijnholds, S.J. ; Brentjens, M. ; Abdalla, F.B. ; Asad, K.M.B. ; Bernardi, G. ; Bus, S. ; Chapman, E. ; Ciardi, B. ; Daiboo, S. ; Fernandez, E.R. ; Ghosh, A. ; Harker, G. ; Jelić, Vibor ; Jensen, H. ; Kazemi, S. ; Lambropoulos, P. ; Martinez-Rubi, O. ; Mellema, G. ; Mevius, M. ; Offringa, A.R. ; Pandey, V.N. ; Patil, A.H. ; Thomas, R.M. ; Veligatla, V. ; Yatawatta, S. ; Zaroubi, S. ; Anderson, J. ; Asgekar, A. ; Bell, M.E. ; Bentum, M.J. ; Best, P. ; Bonafede, A. ; Breitling, F. ; Broderick, J. ; Brüggen, M. ; Butcher, H.R. ; Corstanje, A. ; de Gasperin, F. ; de Geus, E. ; Deller, A. ; Duscha, S. ; Eislöffel, J. ; Engels, D. ; Falcke, H. ; Fallows, R.A. ; Fender, R. ; Ferrari, C. ; Frieswijk, W. ; Garrett, M.A. ; Grießmeier, J. ; Gunst, A.W. ; Hassall, T.E. ; Heald, G. ; Hoeft, M. ; Hörandel, J. ; Iacobelli, M. ; Juette, E. ; Kondratiev, V.I. ; Kuniyoshi, M. ; Kuper, G. ; Mann, G. ; Markoff, S. ; McFadden, R. ; McKay-Bukowski, D. ; McKean, J. P. ; Mulcahy, D.D. ; Munk, H. ; Nelles, A. ; Norden, M.J. ; Orru, E. ; Pandey- Pommier, M. ; Pizzo, R. ; Polatidis, A.G. ; Reich, W. ; Renting, A. ; Röttgering, H. ; Schwarz, D. ; Shulevski, A. ; Smirnov, O. ; Stappers, B.W. ; Steinmetz, M. ; Swinbank, J. ; Tagger, M. ; Tang, Y. ; Tasse, C. ; ter Veen, S. ; Thoudam, S. ; Toribio, C. ; Vocks, C. ; Wise, M.W. ; Wucknitz, O. ; Zarka, P.

Izvornik
Monthly notices of the Royal Astronomical Society (0035-8711) 450 (2015), 3; 2291-2305

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
methods: observational; techniques: interferometric; Moon; dark ages; reionization; first stars

Sažetak
We present radio observations of the Moon between 35 and 80 MHz to demonstrate a novel technique of interferometrically measuring large-scale diffuse emission extending far beyond the primary beam (global signal) for the first time. In particular, we show that (i) the Moon appears as a negative-flux source at frequencies 35 < ν < 80 MHz since it is `colder' than the diffuse Galactic background it occults, (ii) using the (negative) flux of the lunar disc, we can reconstruct the spectrum of the diffuse Galactic emission with the lunar thermal emission as a reference, and (iii) that reflected RFI (radio-frequency interference) is concentrated at the centre of the lunar disc due to specular nature of reflection, and can be independently measured. Our RFI measurements show that (i) Moon-based Cosmic Dawn experiments must design for an Earth-isolation of better than 80 dB to achieve an RFI temperature <1 mK, (ii) Moon- reflected RFI contributes to a dipole temperature less than 20 mK for Earth-based Cosmic Dawn experiments, (iii) man- made satellite-reflected RFI temperature exceeds 20 mK if the aggregate scattering cross-section of visible satellites exceeds 175 m2 at 800 km height, or 15 m2 at 400 km height. Currently, our diffuse background spectrum is limited by sidelobe confusion on short baselines (10-15 per cent level). Further refinement of our technique may yield constraints on the redshifted global 21 cm signal from Cosmic Dawn (40 > z > 12) and the Epoch of Reionization (12 > z > 5).

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA

Profili:

Avatar Url Vibor Jelić (autor)

Poveznice na cjeloviti tekst rada:

doi arxiv.org mnras.oxfordjournals.org

Citiraj ovu publikaciju:

Vedantham, H.K.; Koopmans, L.V.E.; de Bruyn, A.G.; Wijnholds, S.J.; Brentjens, M.; Abdalla, F.B.; Asad, K.M.B.; Bernardi, G.; Bus, S.; Chapman, E. et al.
Lunar occultation of the diffuse radio sky: LOFAR measurements between 35 and 80 MHz // Monthly notices of the Royal Astronomical Society, 450 (2015), 3; 2291-2305 doi:10.1093/mnras/stv746 (međunarodna recenzija, članak, znanstveni)
Vedantham, H., Koopmans, L., de Bruyn, A., Wijnholds, S., Brentjens, M., Abdalla, F., Asad, K., Bernardi, G., Bus, S. & Chapman, E. (2015) Lunar occultation of the diffuse radio sky: LOFAR measurements between 35 and 80 MHz. Monthly notices of the Royal Astronomical Society, 450 (3), 2291-2305 doi:10.1093/mnras/stv746.
@article{article, author = {Vedantham, H.K. and Koopmans, L.V.E. and de Bruyn, A.G. and Wijnholds, S.J. and Brentjens, M. and Abdalla, F.B. and Asad, K.M.B. and Bernardi, G. and Bus, S. and Chapman, E. and Ciardi, B. and Daiboo, S. and Fernandez, E.R. and Ghosh, A. and Harker, G. and Jeli\'{c}, Vibor and Jensen, H. and Kazemi, S. and Lambropoulos, P. and Martinez-Rubi, O. and Mellema, G. and Mevius, M. and Offringa, A.R. and Pandey, V.N. and Patil, A.H. and Thomas, R.M. and Veligatla, V. and Yatawatta, S. and Zaroubi, S. and Anderson, J. and Asgekar, A. and Bell, M.E. and Bentum, M.J. and Best, P. and Bonafede, A. and Breitling, F. and Broderick, J. and Br\"{u}ggen, M. and Butcher, H.R. and Corstanje, A. and de Gasperin, F. and de Geus, E. and Deller, A. and Duscha, S. and Eisl\"{o}ffel, J. and Engels, D. and Falcke, H. and Fallows, R.A. and Fender, R. and Ferrari, C. and Frieswijk, W. and Garrett, M.A. and Grießmeier, J. and Gunst, A.W. and Hassall, T.E. and Heald, G. and Hoeft, M. and H\"{o}randel, J. and Iacobelli, M. and Juette, E. and Kondratiev, V.I. and Kuniyoshi, M. and Kuper, G. and Mann, G. and Markoff, S. and McFadden, R. and McKay-Bukowski, D. and McKean, J. P. and Mulcahy, D.D. and Munk, H. and Nelles, A. and Norden, M.J. and Orru, E. and Pandey- Pommier, M. and Pizzo, R. and Polatidis, A.G. and Reich, W. and Renting, A. and R\"{o}ttgering, H. and Schwarz, D. and Shulevski, A. and Smirnov, O. and Stappers, B.W. and Steinmetz, M. and Swinbank, J. and Tagger, M. and Tang, Y. and Tasse, C. and ter Veen, S. and Thoudam, S. and Toribio, C. and Vocks, C. and Wise, M.W. and Wucknitz, O. and Zarka, P.}, year = {2015}, pages = {2291-2305}, DOI = {10.1093/mnras/stv746}, keywords = {methods: observational, techniques: interferometric, Moon, dark ages, reionization, first stars}, journal = {Monthly notices of the Royal Astronomical Society}, doi = {10.1093/mnras/stv746}, volume = {450}, number = {3}, issn = {0035-8711}, title = {Lunar occultation of the diffuse radio sky: LOFAR measurements between 35 and 80 MHz}, keyword = {methods: observational, techniques: interferometric, Moon, dark ages, reionization, first stars} }
@article{article, author = {Vedantham, H.K. and Koopmans, L.V.E. and de Bruyn, A.G. and Wijnholds, S.J. and Brentjens, M. and Abdalla, F.B. and Asad, K.M.B. and Bernardi, G. and Bus, S. and Chapman, E. and Ciardi, B. and Daiboo, S. and Fernandez, E.R. and Ghosh, A. and Harker, G. and Jeli\'{c}, Vibor and Jensen, H. and Kazemi, S. and Lambropoulos, P. and Martinez-Rubi, O. and Mellema, G. and Mevius, M. and Offringa, A.R. and Pandey, V.N. and Patil, A.H. and Thomas, R.M. and Veligatla, V. and Yatawatta, S. and Zaroubi, S. and Anderson, J. and Asgekar, A. and Bell, M.E. and Bentum, M.J. and Best, P. and Bonafede, A. and Breitling, F. and Broderick, J. and Br\"{u}ggen, M. and Butcher, H.R. and Corstanje, A. and de Gasperin, F. and de Geus, E. and Deller, A. and Duscha, S. and Eisl\"{o}ffel, J. and Engels, D. and Falcke, H. and Fallows, R.A. and Fender, R. and Ferrari, C. and Frieswijk, W. and Garrett, M.A. and Grießmeier, J. and Gunst, A.W. and Hassall, T.E. and Heald, G. and Hoeft, M. and H\"{o}randel, J. and Iacobelli, M. and Juette, E. and Kondratiev, V.I. and Kuniyoshi, M. and Kuper, G. and Mann, G. and Markoff, S. and McFadden, R. and McKay-Bukowski, D. and McKean, J. P. and Mulcahy, D.D. and Munk, H. and Nelles, A. and Norden, M.J. and Orru, E. and Pandey- Pommier, M. and Pizzo, R. and Polatidis, A.G. and Reich, W. and Renting, A. and R\"{o}ttgering, H. and Schwarz, D. and Shulevski, A. and Smirnov, O. and Stappers, B.W. and Steinmetz, M. and Swinbank, J. and Tagger, M. and Tang, Y. and Tasse, C. and ter Veen, S. and Thoudam, S. and Toribio, C. and Vocks, C. and Wise, M.W. and Wucknitz, O. and Zarka, P.}, year = {2015}, pages = {2291-2305}, DOI = {10.1093/mnras/stv746}, keywords = {methods: observational, techniques: interferometric, Moon, dark ages, reionization, first stars}, journal = {Monthly notices of the Royal Astronomical Society}, doi = {10.1093/mnras/stv746}, volume = {450}, number = {3}, issn = {0035-8711}, title = {Lunar occultation of the diffuse radio sky: LOFAR measurements between 35 and 80 MHz}, keyword = {methods: observational, techniques: interferometric, Moon, dark ages, reionization, first stars} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus

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