Millisecond pulsars (MSPs) have been firmly established as a class of gamma-ray emitters via the detection of pulsations above 0.1 GeV from eight MSPs by the Fermi Large Area Telescope (LAT). Using 13 months of LAT data, significant gamma-ray pulsations at the radio period have been detected from the MSP PSR J0034-0534, making it the ninth clear MSP detection by the LAT. The gamma-ray light curve shows two peaks separated by 0.274 +/- 0.015 in phase which are very nearly aligned with the radio peaks, a phenomenon seen only in the Crab pulsar until now. The >= 0.1 GeV spectrum of this pulsar is well fit by an exponentially cutoff power law with a cutoff energy of 1.8 +/- 0.6 +/- 0.1 GeV and a photon index of 1.5 +/- 0.2 +/- 0.1, first errors are statistical and second are systematic. The near-alignment of the radio and gamma-ray peaks strongly suggests that the radio and gamma-ray emission regions are co-located and both are the result of caustic formation.

Discovery of pulsed γ-rays from PSR J0034-0534 with the fermi large area telescope: A case for co-located radio and γ-ray emission regions / Abdo, Aa; Ackermann, M; Ajello, M; Allafort, A; Baldini, L; Ballet, J; Barbiellini, G; Bastieri, D; Bechtol, K; Bellazzini, R; Berenji, B; Blandford, Rd; Bloom, Ed; Bonamente, E; Borgland, Aw; Bouvier, A; Bregeon, J; Brez, A; Brigida, M; Bruel, P; Burnett, Th; Buson, S; Caliandro, Ga; Cameron, Ra; Camilo, F; Caraveo, Pa; Carrigan, S; Casandjian, Jm; Cecchi, C; Celik, O; Chekhtman, A; Cheung, Cc; Chiang, J; Ciprini, S; Claus, R; Cognard, I; Cohen Tanugi, J; Conrad, J; Corbet, R; Decesar, Me; Dermer, Cd; Desvignes, G; de Angelis, A; de Palma, F; Digel, Sw; Dormody, M; Silva, Ede; Drell, Ps; Dubois, R; Dumora, D; Espinoza, C; Farnier, C; Favuzzi, Cecilia; Fegan, Sj; Focke, Wb; Frailis, M; Freire, Pcc; Fukazawa, Y; Funk, S; Fusco, P; Gargano, F; Gasparrini, D; Gehrels, N; Germani, S; Giavitto, G; Giglietto, Nicola; Giordano, F; Glanzman, T; Godfrey, G; Grenier, Ia; Grondin, Mh; Grove, Je; Guillemot, L; Guiriec, S; Hadasch, D; Harding, Ak; Hays, E; Hobbs, G; Horan, D; Hughes, Re; Johannesson, G; Johnson, As; Johnson, Tj; Johnson, Wn; Johnston, S; Kamae, T; Katagiri, H; Kataoka, J; Kawai, N; Kerr, M; Knodlseder, J; Kramer, M; Kuss, M; Lande, J; Latronico, L; Lemoine Goumard, M; Garde, Ml; Longo, F; Loparco, F; Lott, B; Lovellette, Mn; Lubrano, P; Lyne, Ag; Makeev, A; Manchester, Rn; Marelli, M; Mazziotta, Mn; Mcconville, W; Mcenery, Je; Mcglynn, S; Meurer, C; Michelson, Pf; Mitthumsiri, W; Mizuno, T; Moiseev, Aa; Monte, C; Monzani, Me; Morselli, A; Moskalenko, Iv; Murgia, S; Nolan, Pl; Norris, Jp; Noutsos, A; Nuss, E; Ohsugi, T; Omodei, N; Orlando, E; Ormes, Jf; Ozaki, M; Paneque, D; Panetta, Jh; Parent, D; Pelassa, V; Pepe, M; Pesce Rollins, M; Pierbattista, M; Piron, F; Porter, Ta; Raino, S; Rando, R; Ransom, Sm; Razzano, M; Reimer, A; Reimer, O; Reposeur, T; Ripken, J; Ritz, S; Rochester, Ls; Rodriguez, Ay; Romani, Rw; Roth, M; Ryde, F; Sadrozinski, Hfw; Sander, A; Parkinson, Pms; Scargle, Jd; Sgro, C; Siskind, Ej; Smith, Da; Smith, Pd; Spandre, G; Spinelli, P; Stappers, Bw; Starck, Jl; Strickman, Ms; Suson, Dj; Takahashi, H; Tanaka, T; Thayer, Jb; Thayer, Jg; Theureau, G; Thompson, Dj; Thorsett, Se; Tibaldo, L; Torres, Df; Tosti, G; Tramacere, A; Usher, Tl; Van Etten, A; Vasileiou, V; Venter, C; Vilchez, N; Vitale, V; Waite, Ap; Wallace, E; Wang, P; Weltevrede, P; Winer, Bl; Wood, Ks; Ylinen, T; Ziegler, M.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - ELETTRONICO. - 712:2(2010), pp. 957-963. [10.1088/0004-637X/712/2/957]

Discovery of pulsed γ-rays from PSR J0034-0534 with the fermi large area telescope: A case for co-located radio and γ-ray emission regions

FAVUZZI, Cecilia;GIGLIETTO, Nicola;
2010-01-01

Abstract

Millisecond pulsars (MSPs) have been firmly established as a class of gamma-ray emitters via the detection of pulsations above 0.1 GeV from eight MSPs by the Fermi Large Area Telescope (LAT). Using 13 months of LAT data, significant gamma-ray pulsations at the radio period have been detected from the MSP PSR J0034-0534, making it the ninth clear MSP detection by the LAT. The gamma-ray light curve shows two peaks separated by 0.274 +/- 0.015 in phase which are very nearly aligned with the radio peaks, a phenomenon seen only in the Crab pulsar until now. The >= 0.1 GeV spectrum of this pulsar is well fit by an exponentially cutoff power law with a cutoff energy of 1.8 +/- 0.6 +/- 0.1 GeV and a photon index of 1.5 +/- 0.2 +/- 0.1, first errors are statistical and second are systematic. The near-alignment of the radio and gamma-ray peaks strongly suggests that the radio and gamma-ray emission regions are co-located and both are the result of caustic formation.
2010
Discovery of pulsed γ-rays from PSR J0034-0534 with the fermi large area telescope: A case for co-located radio and γ-ray emission regions / Abdo, Aa; Ackermann, M; Ajello, M; Allafort, A; Baldini, L; Ballet, J; Barbiellini, G; Bastieri, D; Bechtol, K; Bellazzini, R; Berenji, B; Blandford, Rd; Bloom, Ed; Bonamente, E; Borgland, Aw; Bouvier, A; Bregeon, J; Brez, A; Brigida, M; Bruel, P; Burnett, Th; Buson, S; Caliandro, Ga; Cameron, Ra; Camilo, F; Caraveo, Pa; Carrigan, S; Casandjian, Jm; Cecchi, C; Celik, O; Chekhtman, A; Cheung, Cc; Chiang, J; Ciprini, S; Claus, R; Cognard, I; Cohen Tanugi, J; Conrad, J; Corbet, R; Decesar, Me; Dermer, Cd; Desvignes, G; de Angelis, A; de Palma, F; Digel, Sw; Dormody, M; Silva, Ede; Drell, Ps; Dubois, R; Dumora, D; Espinoza, C; Farnier, C; Favuzzi, Cecilia; Fegan, Sj; Focke, Wb; Frailis, M; Freire, Pcc; Fukazawa, Y; Funk, S; Fusco, P; Gargano, F; Gasparrini, D; Gehrels, N; Germani, S; Giavitto, G; Giglietto, Nicola; Giordano, F; Glanzman, T; Godfrey, G; Grenier, Ia; Grondin, Mh; Grove, Je; Guillemot, L; Guiriec, S; Hadasch, D; Harding, Ak; Hays, E; Hobbs, G; Horan, D; Hughes, Re; Johannesson, G; Johnson, As; Johnson, Tj; Johnson, Wn; Johnston, S; Kamae, T; Katagiri, H; Kataoka, J; Kawai, N; Kerr, M; Knodlseder, J; Kramer, M; Kuss, M; Lande, J; Latronico, L; Lemoine Goumard, M; Garde, Ml; Longo, F; Loparco, F; Lott, B; Lovellette, Mn; Lubrano, P; Lyne, Ag; Makeev, A; Manchester, Rn; Marelli, M; Mazziotta, Mn; Mcconville, W; Mcenery, Je; Mcglynn, S; Meurer, C; Michelson, Pf; Mitthumsiri, W; Mizuno, T; Moiseev, Aa; Monte, C; Monzani, Me; Morselli, A; Moskalenko, Iv; Murgia, S; Nolan, Pl; Norris, Jp; Noutsos, A; Nuss, E; Ohsugi, T; Omodei, N; Orlando, E; Ormes, Jf; Ozaki, M; Paneque, D; Panetta, Jh; Parent, D; Pelassa, V; Pepe, M; Pesce Rollins, M; Pierbattista, M; Piron, F; Porter, Ta; Raino, S; Rando, R; Ransom, Sm; Razzano, M; Reimer, A; Reimer, O; Reposeur, T; Ripken, J; Ritz, S; Rochester, Ls; Rodriguez, Ay; Romani, Rw; Roth, M; Ryde, F; Sadrozinski, Hfw; Sander, A; Parkinson, Pms; Scargle, Jd; Sgro, C; Siskind, Ej; Smith, Da; Smith, Pd; Spandre, G; Spinelli, P; Stappers, Bw; Starck, Jl; Strickman, Ms; Suson, Dj; Takahashi, H; Tanaka, T; Thayer, Jb; Thayer, Jg; Theureau, G; Thompson, Dj; Thorsett, Se; Tibaldo, L; Torres, Df; Tosti, G; Tramacere, A; Usher, Tl; Van Etten, A; Vasileiou, V; Venter, C; Vilchez, N; Vitale, V; Waite, Ap; Wallace, E; Wang, P; Weltevrede, P; Winer, Bl; Wood, Ks; Ylinen, T; Ziegler, M.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - ELETTRONICO. - 712:2(2010), pp. 957-963. [10.1088/0004-637X/712/2/957]
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