Prof Subir Sarkar: Publications

IceCube

IceCube at Oxford

I am a member since 2004 of the IceCube collaboration which discovered cosmic high energy neutrinos and identified some of their astrophysical sources.

IceCube @ Oxford

Limits on the high-energy gamma and neutrino fluxes from the SGR 1806-20 giant flare of 27 December 2004 with the AMANDA-II detector.

Phys Rev Lett 97:22 (2006) 221101

Authors:

A Achterberg, M Ackermann, J Adams, J Ahrens, K Andeen, DW Atlee, JN Bahcall, X Bai, B Baret, M Bartelt, SW Barwick, R Bay, K Beattie, T Becka, JK Becker, K-H Becker, P Berghaus, D Berley, E Bernardini, D Bertrand, DZ Besson, E Blaufuss, DJ Boersma, C Bohm, J Bolmont, S Böser, O Botner, A Bouchta, J Braun, C Burgess, T Burgess, T Castermans, D Chirkin, B Christy, J Clem, DF Cowen, MV D'Agostino, A Davour, CT Day, C De Clercq, L Demirörs, F Descamps, P Desiati, T Deyoung, JC Diaz-Velez, J Dreyer, JP Dumm, MR Duvoort, WR Edwards, R Ehrlich, J Eisch, RW Ellsworth, PA Evenson, O Fadiran, AR Fazely, T Feser, K Filimonov, BD Fox, TK Gaisser, J Gallagher, R Ganugapati, H Geenen, L Gerhardt, A Goldschmidt, JA Goodman, R Gozzini, S Grullon, A Gross, RM Gunasingha, M Gurtner, A Hallgren, F Halzen, K Han, K Hanson, D Hardtke, R Hardtke, T Harenberg, JE Hart, T Hauschildt, D Hays, J Heise, K Helbing, M Hellwig, P Herquet, GC Hill, J Hodges, KD Hoffman, B Hommez, K Hoshina, D Hubert, B Hughey, PO Hulth, K Hultqvist, S Hundertmark, J-P Hülss, A Ishihara, J Jacobsen, GS Japaridze, A Jones, JM Joseph, K-H Kampert, A Karle, H Kawai, JL Kelley, M Kestel, N Kitamura, SR Klein, S Klepser, G Kohnen, H Kolanoski, L Köpke, M Krasberg, K Kuehn, H Landsman, H Leich, I Liubarsky, J Lundberg, J Madsen, K Mase, HS Matis, T McCauley, CP McParland, A Meli, T Messarius, P Mészáros, H Miyamoto, A Mokhtarani, T Montaruli, A Morey, R Morse, SM Movit, K Münich, R Nahnhauer, JW Nam, P Niessen, DR Nygren, H Ogelman, Ph Olbrechts, A Olivas, S Patton, C Peña-Garay, C Pérez de Los Heros, A Piegsa, D Pieloth, AC Pohl, R Porrata, J Pretz, PB Price, GT Przybylski, K Rawlins, S Razzaque, F Refflinghaus, E Resconi, W Rhode, M Ribordy, A Rizzo, S Robbins, P Roth, C Rott, D Rutledge, D Ryckbosch, H-G Sander, S Sarkar, S Schlenstedt, T Schmidt, D Schneider, D Seckel, SH Seo, S Seunarine, A Silvestri, AJ Smith, M Solarz, C Song, JE Sopher, GM Spiczak, C Spiering, M Stamatikos, T Stanev, P Steffen, T Stezelberger, RG Stokstad, MC Stoufer, S Stoyanov, EA Strahler, T Straszheim, K-H Sulanke, GW Sullivan, TJ Sumner, I Taboada, O Tarasova, A Tepe, L Thollander, S Tilav, PA Toale, D Turcan, N van Eijndhoven, J Vandenbroucke, A Van Overloop, B Voigt, W Wagner, C Walck, H Waldmann, M Walter, Y-R Wang, C Wendt, CH Wiebusch, G Wikström, DR Williams, R Wischnewski, H Wissing, K Woschnagg, XW Xu, G Yodh, S Yoshida, JD Zornoza, IceCube Collaboration

Abstract:

On 27 December 2004, a giant gamma flare from the Soft Gamma-Ray Repeater 1806-20 saturated many satellite gamma-ray detectors, being the brightest transient event ever observed in the Galaxy. AMANDA-II was used to search for down-going muons indicative of high-energy gammas and/or neutrinos from this object. The data revealed no significant signal, so upper limits (at 90% C.L.) on the normalization constant were set: 0.05(0.5) TeV-1 m;{-2} s;{-1} for gamma=-1.47 (-2) in the gamma flux and 0.4(6.1) TeV-1 m;{-2} s;{-1} for gamma=-1.47 (-2) in the high-energy neutrino flux.

Einstein's Universe: The Challenge of Dark Energy

Chapter in The Legacy of Albert Einstein, World Scientific Publishing (2006) 207-224

Working group report: Astroparticle and neutrino physics

Pramana Journal of Physics 67:4 (2006) 735-742

Authors:

R Gandhi, S Mohanty, T Souradeep, S Agarwalla, K Bhattacharya, B Brahmachari, R Crittenden, S Goswami, P Ghoshal, M Lindner, HS Mani, S Mitra, S Pascoli, S Panda, R Rangarajan, S Ray, T Roy Choudhury, R Saha, S Sarkar, A Srivastava, R Sheth, S Uma Sankar, U Yajnik

Abstract:

The working group on astroparticle and neutrino physics at WHEPP-9 covered a wide range of topics. The main topics were neutrino physics at INO, neutrino astronomy and recent constraints on dark energy coming from cosmological observations of large scale structure and CMB anisotropy. © Indian Academy of Sciences.

The intergalactic propagation of ultra-high energy cosmic ray nuclei

(2006)

Authors:

Dan Hooper, Subir Sarkar, Andrew M Taylor

Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory

ArXiv astro-ph/0607382 (2006)

Abstract:

Data from the Pierre Auger Observatory are analyzed to search for anisotropies near the direction of the Galactic Centre at EeV energies. The exposure of the surface array in this part of the sky is already significantly larger than that of the fore-runner experiments. Our results do not support previous findings of localized excesses in the AGASA and SUGAR data. We set an upper bound on a point-like flux of cosmic rays arriving from the Galactic Centre which excludes several scenarios predicting sources of EeV neutrons from Sagittarius $A$. Also the events detected simultaneously by the surface and fluorescence detectors (the `hybrid' data set), which have better pointing accuracy but are less numerous than those of the surface array alone, do not show any significant localized excess from this direction.

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