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Observation of In-ice Askaryan Radiation from High-Energy Cosmic Rays

Fuente: arXiv

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Detalles Bibliográficos
Autores principales:	ARA Collaboration, Alden, N., Ali, S., Allison, P., Archambault, S., Beatty, J. J., Besson, D. Z., Bishop, A., Chen, P., Chen, Y. C., Chen, Y. -C., Chiche, S., Clark, B. A., Connolly, A., Couberly, K., Cremonesi, L., Cummings, A., Dasgupta, P., Debolt, R., de Kockere, S., de Vries, K. D., Deaconu, C., DuVernois, M. A., Flaherty, J., Friedman, E., Gaior, R., Giri, P., Hanson, J., Harty, N., Hoffman, K. D., Huang, M. -H., Hughes, K., Ishihara, A., Karle, A., Kelley, J. L., Kim, K. -C., Kim, M. -C., Kravchenko, I., Krebs, R., Kuo, C. Y., Kurusu, K., Latif, U. A., Liu, C. H., Liu, T. C., Luszczak, W., Machtay, A., Mase, K., Muzio, M. S., Nam, J., Nichol, R. J., Novikov, A., Nozdrina, A., Oberla, E., Pai, C. W., Pan, Y., Pfendner, C., Punsuebsay, N., Roth, J., Salcedo-Gomez, A., Seckel, D., Seikh, M. F. H., Shiao, Y. -S., Stethem, J., Su, S. C., Toscano, S., Torres, J., Touart, J., van Eijndhoven, N., Vieregg, A., Fostier, M. Vilarino, Wang, M. -Z., Wang, S. -H., Windischhofer, P., Wissel, S. A., Xie, C., Yoshida, S., Young, R.
Formato:	Preprint
Publicado:	2025
Materias:	High Energy Astrophysical Phenomena
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

_version_	1866908974654160896
author	ARA Collaboration Alden, N. Ali, S. Allison, P. Archambault, S. Beatty, J. J. Besson, D. Z. Bishop, A. Chen, P. Chen, Y. C. Chen, Y. -C. Chiche, S. Clark, B. A. Connolly, A. Couberly, K. Cremonesi, L. Cummings, A. Dasgupta, P. Debolt, R. de Kockere, S. de Vries, K. D. Deaconu, C. DuVernois, M. A. Flaherty, J. Friedman, E. Gaior, R. Giri, P. Hanson, J. Harty, N. Hoffman, K. D. Huang, M. -H. Hughes, K. Ishihara, A. Karle, A. Kelley, J. L. Kim, K. -C. Kim, M. -C. Kravchenko, I. Krebs, R. Kuo, C. Y. Kurusu, K. Latif, U. A. Liu, C. H. Liu, T. C. Luszczak, W. Machtay, A. Mase, K. Muzio, M. S. Nam, J. Nichol, R. J. Novikov, A. Nozdrina, A. Oberla, E. Pai, C. W. Pan, Y. Pfendner, C. Punsuebsay, N. Roth, J. Salcedo-Gomez, A. Seckel, D. Seikh, M. F. H. Shiao, Y. -S. Stethem, J. Su, S. C. Toscano, S. Torres, J. Touart, J. van Eijndhoven, N. Vieregg, A. Fostier, M. Vilarino Wang, M. -Z. Wang, S. -H. Windischhofer, P. Wissel, S. A. Xie, C. Yoshida, S. Young, R.
author_facet	ARA Collaboration Alden, N. Ali, S. Allison, P. Archambault, S. Beatty, J. J. Besson, D. Z. Bishop, A. Chen, P. Chen, Y. C. Chen, Y. -C. Chiche, S. Clark, B. A. Connolly, A. Couberly, K. Cremonesi, L. Cummings, A. Dasgupta, P. Debolt, R. de Kockere, S. de Vries, K. D. Deaconu, C. DuVernois, M. A. Flaherty, J. Friedman, E. Gaior, R. Giri, P. Hanson, J. Harty, N. Hoffman, K. D. Huang, M. -H. Hughes, K. Ishihara, A. Karle, A. Kelley, J. L. Kim, K. -C. Kim, M. -C. Kravchenko, I. Krebs, R. Kuo, C. Y. Kurusu, K. Latif, U. A. Liu, C. H. Liu, T. C. Luszczak, W. Machtay, A. Mase, K. Muzio, M. S. Nam, J. Nichol, R. J. Novikov, A. Nozdrina, A. Oberla, E. Pai, C. W. Pan, Y. Pfendner, C. Punsuebsay, N. Roth, J. Salcedo-Gomez, A. Seckel, D. Seikh, M. F. H. Shiao, Y. -S. Stethem, J. Su, S. C. Toscano, S. Torres, J. Touart, J. van Eijndhoven, N. Vieregg, A. Fostier, M. Vilarino Wang, M. -Z. Wang, S. -H. Windischhofer, P. Wissel, S. A. Xie, C. Yoshida, S. Young, R.
contents	We present the first experimental evidence for in-ice Askaryan radiation -- coherent charge-excess radio emission -- from high-energy particle cascades developing in the Antarctic ice sheet. In 208 days of data recorded with the phased-array instrument of the Askaryan Radio Array, a previous analysis has incidentally identified 13 events with impulsive radiofrequency signals originating from below the ice surface. We here present a detailed reanalysis of these events. The observed event rate, radiation arrival directions, signal shape, spectral content, and electric field polarization are consistent with in-ice Askaryan radiation from cosmic ray air shower cores impacting the ice sheet. For the brightest events, the angular radiation pattern favors an extended cascade-like emitter over a pointlike source. An origin from the geomagnetic separation of charges in cosmic ray air showers is disfavored by the arrival directions and polarization. Considering the arrival angles, timing properties, and the impulsive nature of the passing events, the event rate is inconsistent with the estimation of the combined background from thermal noise events and on-surface events at the level of $5.1\,σ$.
format	Preprint
id	arxiv_https___arxiv_org_abs_2510_21104
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Observation of In-ice Askaryan Radiation from High-Energy Cosmic Rays ARA Collaboration Alden, N. Ali, S. Allison, P. Archambault, S. Beatty, J. J. Besson, D. Z. Bishop, A. Chen, P. Chen, Y. C. Chen, Y. -C. Chiche, S. Clark, B. A. Connolly, A. Couberly, K. Cremonesi, L. Cummings, A. Dasgupta, P. Debolt, R. de Kockere, S. de Vries, K. D. Deaconu, C. DuVernois, M. A. Flaherty, J. Friedman, E. Gaior, R. Giri, P. Hanson, J. Harty, N. Hoffman, K. D. Huang, M. -H. Hughes, K. Ishihara, A. Karle, A. Kelley, J. L. Kim, K. -C. Kim, M. -C. Kravchenko, I. Krebs, R. Kuo, C. Y. Kurusu, K. Latif, U. A. Liu, C. H. Liu, T. C. Luszczak, W. Machtay, A. Mase, K. Muzio, M. S. Nam, J. Nichol, R. J. Novikov, A. Nozdrina, A. Oberla, E. Pai, C. W. Pan, Y. Pfendner, C. Punsuebsay, N. Roth, J. Salcedo-Gomez, A. Seckel, D. Seikh, M. F. H. Shiao, Y. -S. Stethem, J. Su, S. C. Toscano, S. Torres, J. Touart, J. van Eijndhoven, N. Vieregg, A. Fostier, M. Vilarino Wang, M. -Z. Wang, S. -H. Windischhofer, P. Wissel, S. A. Xie, C. Yoshida, S. Young, R. High Energy Astrophysical Phenomena We present the first experimental evidence for in-ice Askaryan radiation -- coherent charge-excess radio emission -- from high-energy particle cascades developing in the Antarctic ice sheet. In 208 days of data recorded with the phased-array instrument of the Askaryan Radio Array, a previous analysis has incidentally identified 13 events with impulsive radiofrequency signals originating from below the ice surface. We here present a detailed reanalysis of these events. The observed event rate, radiation arrival directions, signal shape, spectral content, and electric field polarization are consistent with in-ice Askaryan radiation from cosmic ray air shower cores impacting the ice sheet. For the brightest events, the angular radiation pattern favors an extended cascade-like emitter over a pointlike source. An origin from the geomagnetic separation of charges in cosmic ray air showers is disfavored by the arrival directions and polarization. Considering the arrival angles, timing properties, and the impulsive nature of the passing events, the event rate is inconsistent with the estimation of the combined background from thermal noise events and on-surface events at the level of $5.1\,σ$.
title	Observation of In-ice Askaryan Radiation from High-Energy Cosmic Rays
topic	High Energy Astrophysical Phenomena
url	https://arxiv.org/abs/2510.21104