Unusual Near-Horizon Cosmic-Ray-like Events Observed by ANITA-IV

P. W. Gorham; A. Ludwig; C. Deaconu; P. Cao; P. Allison; O. Banerjee; L. Batten; D. Bhattacharya; J. J. Beatty; K. Belov; W. R. Binns; V. Bugaev; C. H. Chen; P. Chen; Y. Chen; J. M. Clem; L. Cremonesi; B. Dailey; P. F. Dowkontt; B. D. Fox; J. W.H. Gordon; C. Hast; B. Hill; S. Y. Hsu; J. J. Huang; K. Hughes; R. Hupe; M. H. Israel; T. C. Liu; L. Macchiarulo; S. Matsuno; K. McBride; C. Miki; J. Nam; C. J. Naudet; R. J. Nichol; A. Novikov; E. Oberla; M. Olmedo; R. Prechelt; B. F. Rauch; J. M. Roberts; A. Romero-Wolf; B. Rotter; J. W. Russell; D. Saltzberg; D. Seckel; H. Schoorlemmer; J. Shiao; S. Stafford; J. Stockham; M. Stockham; B. Strutt; M. S. Sutherland; G. S. Varner; A. G. Vieregg; S. H. Wang; S. A. Wissel

doi:10.1103/PhysRevLett.126.071103

Unusual Near-Horizon Cosmic-Ray-like Events Observed by ANITA-IV

P. W. Gorham, A. Ludwig, C. Deaconu, P. Cao, P. Allison, O. Banerjee, L. Batten, D. Bhattacharya, J. J. Beatty, K. Belov, W. R. Binns, V. Bugaev, C. H. Chen, P. Chen, Y. Chen, J. M. Clem, L. Cremonesi, B. Dailey, P. F. Dowkontt, B. D. FoxJ. W.H. Gordon, C. Hast, B. Hill, S. Y. Hsu, J. J. Huang, K. Hughes, R. Hupe, M. H. Israel, T. C. Liu, L. Macchiarulo, S. Matsuno, K. McBride, C. Miki, J. Nam, C. J. Naudet, R. J. Nichol, A. Novikov, E. Oberla, M. Olmedo, R. Prechelt, B. F. Rauch, J. M. Roberts, A. Romero-Wolf, B. Rotter, J. W. Russell, D. Saltzberg, D. Seckel, H. Schoorlemmer, J. Shiao, S. Stafford, J. Stockham, M. Stockham, B. Strutt, M. S. Sutherland, G. S. Varner, A. G. Vieregg, S. H. Wang, S. A. Wissel

Physics

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Abstract

ANITA's fourth long-duration balloon flight in 2016 detected 29 cosmic-ray (CR)-like events on a background of 0.37-0.17+0.27 anthropogenic events. CRs are mainly seen in reflection off the Antarctic ice sheets, creating a phase-inverted waveform polarity. However, four of the below-horizon CR-like events show anomalous noninverted polarity, a p=5.3×10-4 chance if due to background. All anomalous events are from locations near the horizon; ANITA-IV observed no steeply upcoming anomalous events similar to the two such events seen in prior flights.

Original language	English (US)
Article number	071103
Journal	Physical review letters
Volume	126
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.126.071103
State	Published - Feb 19 2021

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.126.071103

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Gorham, P. W., Ludwig, A., Deaconu, C., Cao, P., Allison, P., Banerjee, O., Batten, L., Bhattacharya, D., Beatty, J. J., Belov, K., Binns, W. R., Bugaev, V., Chen, C. H., Chen, P., Chen, Y., Clem, J. M., Cremonesi, L., Dailey, B., Dowkontt, P. F., ... Wissel, S. A. (2021). Unusual Near-Horizon Cosmic-Ray-like Events Observed by ANITA-IV. Physical review letters, 126(7), Article 071103. https://doi.org/10.1103/PhysRevLett.126.071103

@article{8e3b3c344dc3414e847e87bfcdebe670,

title = "Unusual Near-Horizon Cosmic-Ray-like Events Observed by ANITA-IV",

abstract = "ANITA's fourth long-duration balloon flight in 2016 detected 29 cosmic-ray (CR)-like events on a background of 0.37-0.17+0.27 anthropogenic events. CRs are mainly seen in reflection off the Antarctic ice sheets, creating a phase-inverted waveform polarity. However, four of the below-horizon CR-like events show anomalous noninverted polarity, a p=5.3×10-4 chance if due to background. All anomalous events are from locations near the horizon; ANITA-IV observed no steeply upcoming anomalous events similar to the two such events seen in prior flights.",

author = "Gorham, {P. W.} and A. Ludwig and C. Deaconu and P. Cao and P. Allison and O. Banerjee and L. Batten and D. Bhattacharya and Beatty, {J. J.} and K. Belov and Binns, {W. R.} and V. Bugaev and Chen, {C. H.} and P. Chen and Y. Chen and Clem, {J. M.} and L. Cremonesi and B. Dailey and Dowkontt, {P. F.} and Fox, {B. D.} and Gordon, {J. W.H.} and C. Hast and B. Hill and Hsu, {S. Y.} and Huang, {J. J.} and K. Hughes and R. Hupe and Israel, {M. H.} and Liu, {T. C.} and L. Macchiarulo and S. Matsuno and K. McBride and C. Miki and J. Nam and Naudet, {C. J.} and Nichol, {R. J.} and A. Novikov and E. Oberla and M. Olmedo and R. Prechelt and Rauch, {B. F.} and Roberts, {J. M.} and A. Romero-Wolf and B. Rotter and Russell, {J. W.} and D. Saltzberg and D. Seckel and H. Schoorlemmer and J. Shiao and S. Stafford and J. Stockham and M. Stockham and B. Strutt and Sutherland, {M. S.} and Varner, {G. S.} and Vieregg, {A. G.} and Wang, {S. H.} and Wissel, {S. A.}",

note = "Funding Information: ANITA-IV was supported by NASA Grant No. NNX15AC24G and related grants. We thank the staff of the Columbia Scientific Balloon Facility for their generous support. This work was supported by the Kavli Institute for Cosmological Physics at the University of Chicago. Computing resources were provided by the Research Computing Center at the University of Chicago and the Ohio Supercomputing Center at The Ohio State University. O. B. and L. C.{\textquoteright}s work was supported by collaborative visits funded by the Cosmology and Astroparticle Student and Postdoc Exchange Network (CASPEN). S. A. W. thanks the Cal Poly Frost Fund and the CSU Research, Scholarship, and Creative Activity (RSCA) Grant Program. The University College London group was also supported by the Leverhulme Trust. The National Taiwan University group is supported by Taiwan{\textquoteright}s Ministry of Science and Technology (MOST) under its Vanguard Program No. 106-2119-M-002-011. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = feb,

day = "19",

doi = "10.1103/PhysRevLett.126.071103",

language = "English (US)",

volume = "126",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "7",

}

Gorham, PW, Ludwig, A, Deaconu, C, Cao, P, Allison, P, Banerjee, O, Batten, L, Bhattacharya, D, Beatty, JJ, Belov, K, Binns, WR, Bugaev, V, Chen, CH, Chen, P, Chen, Y, Clem, JM, Cremonesi, L, Dailey, B, Dowkontt, PF, Fox, BD, Gordon, JWH, Hast, C, Hill, B, Hsu, SY, Huang, JJ, Hughes, K, Hupe, R, Israel, MH, Liu, TC, Macchiarulo, L, Matsuno, S, McBride, K, Miki, C, Nam, J, Naudet, CJ, Nichol, RJ, Novikov, A, Oberla, E, Olmedo, M, Prechelt, R, Rauch, BF, Roberts, JM, Romero-Wolf, A, Rotter, B, Russell, JW, Saltzberg, D, Seckel, D, Schoorlemmer, H, Shiao, J, Stafford, S, Stockham, J, Stockham, M, Strutt, B, Sutherland, MS, Varner, GS, Vieregg, AG, Wang, SH & Wissel, SA 2021, 'Unusual Near-Horizon Cosmic-Ray-like Events Observed by ANITA-IV', Physical review letters, vol. 126, no. 7, 071103. https://doi.org/10.1103/PhysRevLett.126.071103

TY - JOUR

T1 - Unusual Near-Horizon Cosmic-Ray-like Events Observed by ANITA-IV

AU - Gorham, P. W.

AU - Ludwig, A.

AU - Deaconu, C.

AU - Cao, P.

AU - Allison, P.

AU - Banerjee, O.

AU - Batten, L.

AU - Bhattacharya, D.

AU - Beatty, J. J.

AU - Belov, K.

AU - Binns, W. R.

AU - Bugaev, V.

AU - Chen, C. H.

AU - Chen, P.

AU - Chen, Y.

AU - Clem, J. M.

AU - Cremonesi, L.

AU - Dailey, B.

AU - Dowkontt, P. F.

AU - Fox, B. D.

AU - Gordon, J. W.H.

AU - Hast, C.

AU - Hill, B.

AU - Hsu, S. Y.

AU - Huang, J. J.

AU - Hughes, K.

AU - Hupe, R.

AU - Israel, M. H.

AU - Liu, T. C.

AU - Macchiarulo, L.

AU - Matsuno, S.

AU - McBride, K.

AU - Miki, C.

AU - Nam, J.

AU - Naudet, C. J.

AU - Nichol, R. J.

AU - Novikov, A.

AU - Oberla, E.

AU - Olmedo, M.

AU - Prechelt, R.

AU - Rauch, B. F.

AU - Roberts, J. M.

AU - Romero-Wolf, A.

AU - Rotter, B.

AU - Russell, J. W.

AU - Saltzberg, D.

AU - Seckel, D.

AU - Schoorlemmer, H.

AU - Shiao, J.

AU - Stafford, S.

AU - Stockham, J.

AU - Stockham, M.

AU - Strutt, B.

AU - Sutherland, M. S.

AU - Varner, G. S.

AU - Vieregg, A. G.

AU - Wang, S. H.

AU - Wissel, S. A.

N1 - Funding Information: ANITA-IV was supported by NASA Grant No. NNX15AC24G and related grants. We thank the staff of the Columbia Scientific Balloon Facility for their generous support. This work was supported by the Kavli Institute for Cosmological Physics at the University of Chicago. Computing resources were provided by the Research Computing Center at the University of Chicago and the Ohio Supercomputing Center at The Ohio State University. O. B. and L. C.’s work was supported by collaborative visits funded by the Cosmology and Astroparticle Student and Postdoc Exchange Network (CASPEN). S. A. W. thanks the Cal Poly Frost Fund and the CSU Research, Scholarship, and Creative Activity (RSCA) Grant Program. The University College London group was also supported by the Leverhulme Trust. The National Taiwan University group is supported by Taiwan’s Ministry of Science and Technology (MOST) under its Vanguard Program No. 106-2119-M-002-011. Publisher Copyright: © 2021 American Physical Society.

PY - 2021/2/19

Y1 - 2021/2/19

N2 - ANITA's fourth long-duration balloon flight in 2016 detected 29 cosmic-ray (CR)-like events on a background of 0.37-0.17+0.27 anthropogenic events. CRs are mainly seen in reflection off the Antarctic ice sheets, creating a phase-inverted waveform polarity. However, four of the below-horizon CR-like events show anomalous noninverted polarity, a p=5.3×10-4 chance if due to background. All anomalous events are from locations near the horizon; ANITA-IV observed no steeply upcoming anomalous events similar to the two such events seen in prior flights.

AB - ANITA's fourth long-duration balloon flight in 2016 detected 29 cosmic-ray (CR)-like events on a background of 0.37-0.17+0.27 anthropogenic events. CRs are mainly seen in reflection off the Antarctic ice sheets, creating a phase-inverted waveform polarity. However, four of the below-horizon CR-like events show anomalous noninverted polarity, a p=5.3×10-4 chance if due to background. All anomalous events are from locations near the horizon; ANITA-IV observed no steeply upcoming anomalous events similar to the two such events seen in prior flights.

UR - http://www.scopus.com/inward/record.url?scp=85102404535&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85102404535&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.126.071103

DO - 10.1103/PhysRevLett.126.071103

M3 - Article

C2 - 33666466

AN - SCOPUS:85102404535

SN - 0031-9007

VL - 126

JO - Physical review letters

JF - Physical review letters

IS - 7

M1 - 071103

ER -

Unusual Near-Horizon Cosmic-Ray-like Events Observed by ANITA-IV

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