Fermi large area telescope observations of the vela pulsar

A. A. Abdo; M. Ackermann; W. B. Atwood; R. Bagagli; L. Baldini; J. Ballet; D. L. Band; G. Barbiellini; M. G. Baring; J. Bartelt; D. Bastieri; B. M. Baughman; K. Bechtol; F. Bellardi; R. Bellazzini; B. Berenji; D. Bisello; R. D. Blandford; E. D. Bloom; J. R. Bogart; E. Bonamente; A. W. Borgland; A. Bouvier; J. Bregeon; A. Brez; M. Brigida; P. Bruel; T. H. Burnett; G. A. Caliandro; R. A. Cameron; F. Camilo; P. A. Caraveo; J. M. Casandjian; M. Ceccanti; C. Cecchi; E. Charles; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; I. Cognard; J. Cohen-Tanugi; L. R. Cominsky; J. Conrad; R. Corbet; L. Corucci; S. Cutini; D. S. Davis; M. Deklotz; C. D. Dermer; A. De Angelis; F. De Palma; S. W. Digel; M. Dormody; E. Do Couto E. Silva; P. S. Drell; R. Dubois; D. Dumora; C. Espinoza; C. Farnier; C. Favuzzi; D. L. Flath; P. Fleury; W. B. Focke; M. Frailis; P. C.C. Friere; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; R. Giannitrapani; B. Giebels; N. Giglietto; F. Giordano; T. Glanzman; G. Godfrey; E. V. Gotthelf; I. A. Grenier; M. H. Grondin; J. E. Grove; L. Guillemot; S. Guiriec; G. Haller; A. K. Harding; P. A. Hart; R. C. Hartman; E. Hays; G. Hobbs; R. E. Hughes; G. Jóhannesson; A. S. Johnson; R. P. Johnson; T. J. Johnson; W. N. Johnson; S. Johnston; T. Kamae; G. Kanbach; V. M. Kaspi; H. Katagiri; J. Kataoka; A. Kavelaars; N. Kawai; H. Kelly; M. Kerr; B. Kiziltan; W. Klamra; J. Knödlseder; M. Kramer; F. Kuehn; M. Kuss; J. Lande; D. Landriu; L. Latronico; B. Lee; S. H. Lee; M. Lemoine-Goumard; M. Livingstone; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; A. G. Lyne; G. M. Madejski; A. Makeev; R. N. Manchester; B. Marangelli; M. Marelli; M. N. Mazziotta; J. E. McEnery; S. McGlynn; M. A. McLaughlin; N. Menon; C. Meurer; P. F. Michelson; T. Mineo; N. Mirizzi; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; M. Mongelli; C. Monte; M. E. Monzani; E. Moretti; A. Morselli; I. V. Moskalenko; S. Murgia; T. Nakamori; P. L. Nolan; A. Noutsos; E. Nuss; T. Ohsugi; N. Omodei; E. Orlando; J. F. Ormes; M. Ozaki; A. Paccagnella; D. Paneque; J. H. Panetta; D. Parent; M. Pearce; M. Pepe; M. Perchiazzi; M. Pesce-Rollins; L. Pieri; M. Pinchera; F. Piron; T. A. Porter; S. Rainò; R. Rando; S. M. Ransom; E. Rapposelli; M. Razzano; A. Reimer; O. Reimer; T. Reposeur; L. C. Reyes; S. Ritz; L. S. Rochester; A. Y. Rodriguez; R. W. Romani; M. Roth; F. Ryde; A. Sacchetti; H. F.W. Sadrozinski; N. Saggini; D. Sanchez; A. Sander; P. M.Saz Parkinson; K. N. Segal; A. Sellerholm; C. Sgrò; E. J. Siskind; D. A. Smith; P. D. Smith; G. Spandre; P. Spinelli; M. Stamatikos; J. L. Starck; F. W. Stecker; T. E. Stephens; M. S. Strickman; A. W. Strong; D. J. Suson; H. Tajima; H. Takahashi; T. Takahashi; T. Tanaka; A. Tenze; J. B. Thayer; J. G. Thayer; G. Theureau; D. J. Thompson; S. E. Thorsett; L. Tibaldo; O. Tibolla; D. F. Torres; A. Tramacere; M. Turri; T. L. Usher; L. Vigiani; N. Vilchez; V. Vitale; A. P. Waite; P. Wang; K. Watters; P. Weltevrede; B. L. Winer; K. S. Wood; T. Ylinen; M. Ziegler

doi:10.1088/0004-637X/696/2/1084

Fermi large area telescope observations of the vela pulsar

A. A. Abdo^*, M. Ackermann, W. B. Atwood, R. Bagagli, L. Baldini, J. Ballet, D. L. Band, G. Barbiellini, M. G. Baring, J. Bartelt, D. Bastieri, B. M. Baughman, K. Bechtol, F. Bellardi, R. Bellazzini, B. Berenji, D. Bisello, R. D. Blandford, E. D. Bloom, J. R. BogartE. Bonamente, A. W. Borgland, A. Bouvier, J. Bregeon, A. Brez, M. Brigida, P. Bruel, T. H. Burnett, G. A. Caliandro, R. A. Cameron, F. Camilo, P. A. Caraveo, J. M. Casandjian, M. Ceccanti, C. Cecchi, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, I. Cognard, J. Cohen-Tanugi, L. R. Cominsky, J. Conrad, R. Corbet, L. Corucci, S. Cutini, D. S. Davis, M. Deklotz, C. D. Dermer, A. De Angelis, F. De Palma, S. W. Digel, M. Dormody, E. Do Couto E. Silva, P. S. Drell, R. Dubois, D. Dumora, C. Espinoza, C. Farnier, C. Favuzzi, D. L. Flath, P. Fleury, W. B. Focke, M. Frailis, P. C.C. Friere, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, R. Giannitrapani, B. Giebels, N. Giglietto, F. Giordano, T. Glanzman, G. Godfrey, E. V. Gotthelf, I. A. Grenier, M. H. Grondin, J. E. Grove, L. Guillemot, S. Guiriec, G. Haller, A. K. Harding, P. A. Hart, R. C. Hartman, E. Hays, G. Hobbs, R. E. Hughes, G. Jóhannesson, A. S. Johnson, R. P. Johnson, T. J. Johnson, W. N. Johnson, S. Johnston, T. Kamae, G. Kanbach, V. M. Kaspi, H. Katagiri, J. Kataoka, A. Kavelaars, N. Kawai, H. Kelly, M. Kerr, B. Kiziltan, W. Klamra, J. Knödlseder, M. Kramer, F. Kuehn, M. Kuss, J. Lande, D. Landriu, L. Latronico, B. Lee, S. H. Lee, M. Lemoine-Goumard, M. Livingstone, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, A. G. Lyne, G. M. Madejski, A. Makeev, R. N. Manchester, B. Marangelli, M. Marelli, M. N. Mazziotta, J. E. McEnery, S. McGlynn, M. A. McLaughlin, N. Menon, C. Meurer, P. F. Michelson, T. Mineo, N. Mirizzi, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, M. Mongelli, C. Monte, M. E. Monzani, E. Moretti, A. Morselli, I. V. Moskalenko, S. Murgia, T. Nakamori, P. L. Nolan, A. Noutsos, E. Nuss, T. Ohsugi, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, A. Paccagnella, D. Paneque, J. H. Panetta, D. Parent, M. Pearce, M. Pepe, M. Perchiazzi, M. Pesce-Rollins, L. Pieri, M. Pinchera, F. Piron, T. A. Porter, S. Rainò, R. Rando, S. M. Ransom, E. Rapposelli, M. Razzano, A. Reimer, O. Reimer, T. Reposeur, L. C. Reyes, S. Ritz, L. S. Rochester, A. Y. Rodriguez, R. W. Romani, M. Roth, F. Ryde, A. Sacchetti, H. F.W. Sadrozinski, N. Saggini, D. Sanchez, A. Sander, P. M.Saz Parkinson, K. N. Segal, A. Sellerholm, C. Sgrò, E. J. Siskind, D. A. Smith, P. D. Smith, G. Spandre, P. Spinelli, M. Stamatikos, J. L. Starck, F. W. Stecker, T. E. Stephens, M. S. Strickman, A. W. Strong, D. J. Suson, H. Tajima, H. Takahashi, T. Takahashi, T. Tanaka, A. Tenze, J. B. Thayer, J. G. Thayer, G. Theureau, D. J. Thompson, S. E. Thorsett, L. Tibaldo, O. Tibolla, D. F. Torres, A. Tramacere, M. Turri, T. L. Usher, L. Vigiani, N. Vilchez, V. Vitale, A. P. Waite, P. Wang, K. Watters, P. Weltevrede, B. L. Winer, K. S. Wood, T. Ylinen, M. Ziegler

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

140 Citations (Scopus)

Abstract

The Vela pulsar is the brightest persistent source in the GeV sky and thus is the traditional first target for new γ-ray observatories. We report here on initial Fermi Large Area Telescope observations during verification phase pointed exposure and early sky survey scanning. We have used the Vela signal to verify Fermi timing and angular resolution. The high-quality pulse profile, with some 32,400 pulsed photons at E ≥ 0.03GeV, shows new features, including pulse structure as fine as 0.3ms and a distinct third peak, which shifts in phase with energy. We examine the high-energy behavior of the pulsed emission; initial spectra suggest a phase-averaged power-law index of Γ = 1.51^+0.05 _-0.04 with an exponential cutoff at E _c = 2.9 ± 0.1 GeV. Spectral fits with generalized cutoffs of the form require b ≤ 1, which is inconsistent with magnetic pair attenuation, and thus favor outer-magnetosphere emission models. Finally, we report on upper limits to any unpulsed component, as might be associated with a surrounding pulsar wind nebula.

Original language	English
Pages (from-to)	1084-1093
Number of pages	10
Journal	Astrophysical Journal
Volume	696
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/696/2/1084
Publication status	Published - 2009 May 10
Externally published	Yes

Keywords

gamma rays: observations
pulsars: individual (PSR B0833-45)

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1088/0004-637X/696/2/1084

Cite this

Abdo, A. A., Ackermann, M., Atwood, W. B., Bagagli, R., Baldini, L., Ballet, J., Band, D. L., Barbiellini, G., Baring, M. G., Bartelt, J., Bastieri, D., Baughman, B. M., Bechtol, K., Bellardi, F., Bellazzini, R., Berenji, B., Bisello, D., Blandford, R. D., Bloom, E. D., ... Ziegler, M. (2009). Fermi large area telescope observations of the vela pulsar. Astrophysical Journal, 696(2), 1084-1093. https://doi.org/10.1088/0004-637X/696/2/1084

Abdo, AA, Ackermann, M, Atwood, WB, Bagagli, R, Baldini, L, Ballet, J, Band, DL, Barbiellini, G, Baring, MG, Bartelt, J, Bastieri, D, Baughman, BM, Bechtol, K, Bellardi, F, Bellazzini, R, Berenji, B, Bisello, D, Blandford, RD, Bloom, ED, Bogart, JR, Bonamente, E, Borgland, AW, Bouvier, A, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Burnett, TH, Caliandro, GA, Cameron, RA, Camilo, F, Caraveo, PA, Casandjian, JM, Ceccanti, M, Cecchi, C, Charles, E, Chekhtman, A, Cheung, CC, Chiang, J, Ciprini, S, Claus, R, Cognard, I, Cohen-Tanugi, J, Cominsky, LR, Conrad, J, Corbet, R, Corucci, L, Cutini, S, Davis, DS, Deklotz, M, Dermer, CD, De Angelis, A, De Palma, F, Digel, SW, Dormody, M, Silva, EDCE, Drell, PS, Dubois, R, Dumora, D, Espinoza, C, Farnier, C, Favuzzi, C, Flath, DL, Fleury, P, Focke, WB, Frailis, M, Friere, PCC, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giannitrapani, R, Giebels, B, Giglietto, N, Giordano, F, Glanzman, T, Godfrey, G, Gotthelf, EV, Grenier, IA, Grondin, MH, Grove, JE, Guillemot, L, Guiriec, S, Haller, G, Harding, AK, Hart, PA, Hartman, RC, Hays, E, Hobbs, G, Hughes, RE, Jóhannesson, G, Johnson, AS, Johnson, RP, Johnson, TJ, Johnson, WN, Johnston, S, Kamae, T, Kanbach, G, Kaspi, VM, Katagiri, H, Kataoka, J, Kavelaars, A, Kawai, N, Kelly, H, Kerr, M, Kiziltan, B, Klamra, W, Knödlseder, J, Kramer, M, Kuehn, F, Kuss, M, Lande, J, Landriu, D, Latronico, L, Lee, B, Lee, SH, Lemoine-Goumard, M, Livingstone, M, Longo, F, Loparco, F, Lott, B, Lovellette, MN, Lubrano, P, Lyne, AG, Madejski, GM, Makeev, A, Manchester, RN, Marangelli, B, Marelli, M, Mazziotta, MN, McEnery, JE, McGlynn, S, McLaughlin, MA, Menon, N, Meurer, C, Michelson, PF, Mineo, T, Mirizzi, N, Mitthumsiri, W, Mizuno, T, Moiseev, AA, Mongelli, M, Monte, C, Monzani, ME, Moretti, E, Morselli, A, Moskalenko, IV, Murgia, S, Nakamori, T, Nolan, PL, Noutsos, A, Nuss, E, Ohsugi, T, Omodei, N, Orlando, E, Ormes, JF, Ozaki, M, Paccagnella, A, Paneque, D, Panetta, JH, Parent, D, Pearce, M, Pepe, M, Perchiazzi, M, Pesce-Rollins, M, Pieri, L, Pinchera, M, Piron, F, Porter, TA, Rainò, S, Rando, R, Ransom, SM, Rapposelli, E, Razzano, M, Reimer, A, Reimer, O, Reposeur, T, Reyes, LC, Ritz, S, Rochester, LS, Rodriguez, AY, Romani, RW, Roth, M, Ryde, F, Sacchetti, A, Sadrozinski, HFW, Saggini, N, Sanchez, D, Sander, A, Parkinson, PMS, Segal, KN, Sellerholm, A, Sgrò, C, Siskind, EJ, Smith, DA, Smith, PD, Spandre, G, Spinelli, P, Stamatikos, M, Starck, JL, Stecker, FW, Stephens, TE, Strickman, MS, Strong, AW, Suson, DJ, Tajima, H, Takahashi, H, Takahashi, T, Tanaka, T, Tenze, A, Thayer, JB, Thayer, JG, Theureau, G, Thompson, DJ, Thorsett, SE, Tibaldo, L, Tibolla, O, Torres, DF, Tramacere, A, Turri, M, Usher, TL, Vigiani, L, Vilchez, N, Vitale, V, Waite, AP, Wang, P, Watters, K, Weltevrede, P, Winer, BL, Wood, KS, Ylinen, T & Ziegler, M 2009, 'Fermi large area telescope observations of the vela pulsar', Astrophysical Journal, vol. 696, no. 2, pp. 1084-1093. https://doi.org/10.1088/0004-637X/696/2/1084

@article{f63033fa3bdb4e0b8dbb11e666ae5d86,

title = "Fermi large area telescope observations of the vela pulsar",

abstract = "The Vela pulsar is the brightest persistent source in the GeV sky and thus is the traditional first target for new γ-ray observatories. We report here on initial Fermi Large Area Telescope observations during verification phase pointed exposure and early sky survey scanning. We have used the Vela signal to verify Fermi timing and angular resolution. The high-quality pulse profile, with some 32,400 pulsed photons at E ≥ 0.03GeV, shows new features, including pulse structure as fine as 0.3ms and a distinct third peak, which shifts in phase with energy. We examine the high-energy behavior of the pulsed emission; initial spectra suggest a phase-averaged power-law index of Γ = 1.51+0.05 -0.04 with an exponential cutoff at E c = 2.9 ± 0.1 GeV. Spectral fits with generalized cutoffs of the form require b ≤ 1, which is inconsistent with magnetic pair attenuation, and thus favor outer-magnetosphere emission models. Finally, we report on upper limits to any unpulsed component, as might be associated with a surrounding pulsar wind nebula.",

keywords = "gamma rays: observations, pulsars: individual (PSR B0833-45)",

author = "Abdo, {A. A.} and M. Ackermann and Atwood, {W. B.} and R. Bagagli and L. Baldini and J. Ballet and Band, {D. L.} and G. Barbiellini and Baring, {M. G.} and J. Bartelt and D. Bastieri and Baughman, {B. M.} and K. Bechtol and F. Bellardi and R. Bellazzini and B. Berenji and D. Bisello and Blandford, {R. D.} and Bloom, {E. D.} and Bogart, {J. R.} and E. Bonamente and Borgland, {A. W.} and A. Bouvier and J. Bregeon and A. Brez and M. Brigida and P. Bruel and Burnett, {T. H.} and Caliandro, {G. A.} and Cameron, {R. A.} and F. Camilo and Caraveo, {P. A.} and Casandjian, {J. M.} and M. Ceccanti and C. Cecchi and E. Charles and A. Chekhtman and Cheung, {C. C.} and J. Chiang and S. Ciprini and R. Claus and I. Cognard and J. Cohen-Tanugi and Cominsky, {L. R.} and J. Conrad and R. Corbet and L. Corucci and S. Cutini and Davis, {D. S.} and M. Deklotz and Dermer, {C. D.} and {De Angelis}, A. and {De Palma}, F. and Digel, {S. W.} and M. Dormody and Silva, {E. Do Couto E.} and Drell, {P. S.} and R. Dubois and D. Dumora and C. Espinoza and C. Farnier and C. Favuzzi and Flath, {D. L.} and P. Fleury and Focke, {W. B.} and M. Frailis and Friere, {P. C.C.} and Y. Fukazawa and S. Funk and P. Fusco and F. Gargano and D. Gasparrini and N. Gehrels and S. Germani and R. Giannitrapani and B. Giebels and N. Giglietto and F. Giordano and T. Glanzman and G. Godfrey and Gotthelf, {E. V.} and Grenier, {I. A.} and Grondin, {M. H.} and Grove, {J. E.} and L. Guillemot and S. Guiriec and G. Haller and Harding, {A. K.} and Hart, {P. A.} and Hartman, {R. C.} and E. Hays and G. Hobbs and Hughes, {R. E.} and G. J{\'o}hannesson and Johnson, {A. S.} and Johnson, {R. P.} and Johnson, {T. J.} and Johnson, {W. N.} and S. Johnston and T. Kamae and G. Kanbach and Kaspi, {V. M.} and H. Katagiri and J. Kataoka and A. Kavelaars and N. Kawai and H. Kelly and M. Kerr and B. Kiziltan and W. Klamra and J. Kn{\"o}dlseder and M. Kramer and F. Kuehn and M. Kuss and J. Lande and D. Landriu and L. Latronico and B. Lee and Lee, {S. H.} and M. Lemoine-Goumard and M. Livingstone and F. Longo and F. Loparco and B. Lott and Lovellette, {M. N.} and P. Lubrano and Lyne, {A. G.} and Madejski, {G. M.} and A. Makeev and Manchester, {R. N.} and B. Marangelli and M. Marelli and Mazziotta, {M. N.} and McEnery, {J. E.} and S. McGlynn and McLaughlin, {M. A.} and N. Menon and C. Meurer and Michelson, {P. F.} and T. Mineo and N. Mirizzi and W. Mitthumsiri and T. Mizuno and Moiseev, {A. A.} and M. Mongelli and C. Monte and Monzani, {M. E.} and E. Moretti and A. Morselli and Moskalenko, {I. V.} and S. Murgia and T. Nakamori and Nolan, {P. L.} and A. Noutsos and E. Nuss and T. Ohsugi and N. Omodei and E. Orlando and Ormes, {J. F.} and M. Ozaki and A. Paccagnella and D. Paneque and Panetta, {J. H.} and D. Parent and M. Pearce and M. Pepe and M. Perchiazzi and M. Pesce-Rollins and L. Pieri and M. Pinchera and F. Piron and Porter, {T. A.} and S. Rain{\`o} and R. Rando and Ransom, {S. M.} and E. Rapposelli and M. Razzano and A. Reimer and O. Reimer and T. Reposeur and Reyes, {L. C.} and S. Ritz and Rochester, {L. S.} and Rodriguez, {A. Y.} and Romani, {R. W.} and M. Roth and F. Ryde and A. Sacchetti and Sadrozinski, {H. F.W.} and N. Saggini and D. Sanchez and A. Sander and Parkinson, {P. M.Saz} and Segal, {K. N.} and A. Sellerholm and C. Sgr{\`o} and Siskind, {E. J.} and Smith, {D. A.} and Smith, {P. D.} and G. Spandre and P. Spinelli and M. Stamatikos and Starck, {J. L.} and Stecker, {F. W.} and Stephens, {T. E.} and Strickman, {M. S.} and Strong, {A. W.} and Suson, {D. J.} and H. Tajima and H. Takahashi and T. Takahashi and T. Tanaka and A. Tenze and Thayer, {J. B.} and Thayer, {J. G.} and G. Theureau and Thompson, {D. J.} and Thorsett, {S. E.} and L. Tibaldo and O. Tibolla and Torres, {D. F.} and A. Tramacere and M. Turri and Usher, {T. L.} and L. Vigiani and N. Vilchez and V. Vitale and Waite, {A. P.} and P. Wang and K. Watters and P. Weltevrede and Winer, {B. L.} and Wood, {K. S.} and T. Ylinen and M. Ziegler",

year = "2009",

month = may,

day = "10",

doi = "10.1088/0004-637X/696/2/1084",

language = "English",

volume = "696",

pages = "1084--1093",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "2",

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TY - JOUR

T1 - Fermi large area telescope observations of the vela pulsar

AU - Abdo, A. A.

AU - Ackermann, M.

AU - Atwood, W. B.

AU - Bagagli, R.

AU - Baldini, L.

AU - Ballet, J.

AU - Band, D. L.

AU - Barbiellini, G.

AU - Baring, M. G.

AU - Bartelt, J.

AU - Bastieri, D.

AU - Baughman, B. M.

AU - Bechtol, K.

AU - Bellardi, F.

AU - Bellazzini, R.

AU - Berenji, B.

AU - Bisello, D.

AU - Blandford, R. D.

AU - Bloom, E. D.

AU - Bogart, J. R.

AU - Bonamente, E.

AU - Borgland, A. W.

AU - Bouvier, A.

AU - Bregeon, J.

AU - Brez, A.

AU - Brigida, M.

AU - Bruel, P.

AU - Burnett, T. H.

AU - Caliandro, G. A.

AU - Cameron, R. A.

AU - Camilo, F.

AU - Caraveo, P. A.

AU - Casandjian, J. M.

AU - Ceccanti, M.

AU - Cecchi, C.

AU - Charles, E.

AU - Chekhtman, A.

AU - Cheung, C. C.

AU - Chiang, J.

AU - Ciprini, S.

AU - Claus, R.

AU - Cognard, I.

AU - Cohen-Tanugi, J.

AU - Cominsky, L. R.

AU - Conrad, J.

AU - Corbet, R.

AU - Corucci, L.

AU - Cutini, S.

AU - Davis, D. S.

AU - Deklotz, M.

AU - Dermer, C. D.

AU - De Angelis, A.

AU - De Palma, F.

AU - Digel, S. W.

AU - Dormody, M.

AU - Silva, E. Do Couto E.

AU - Drell, P. S.

AU - Dubois, R.

AU - Dumora, D.

AU - Espinoza, C.

AU - Farnier, C.

AU - Favuzzi, C.

AU - Flath, D. L.

AU - Fleury, P.

AU - Focke, W. B.

AU - Frailis, M.

AU - Friere, P. C.C.

AU - Fukazawa, Y.

AU - Funk, S.

AU - Fusco, P.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Gehrels, N.

AU - Germani, S.

AU - Giannitrapani, R.

AU - Giebels, B.

AU - Giglietto, N.

AU - Giordano, F.

AU - Glanzman, T.

AU - Godfrey, G.

AU - Gotthelf, E. V.

AU - Grenier, I. A.

AU - Grondin, M. H.

AU - Grove, J. E.

AU - Guillemot, L.

AU - Guiriec, S.

AU - Haller, G.

AU - Harding, A. K.

AU - Hart, P. A.

AU - Hartman, R. C.

AU - Hays, E.

AU - Hobbs, G.

AU - Hughes, R. E.

AU - Jóhannesson, G.

AU - Johnson, A. S.

AU - Johnson, R. P.

AU - Johnson, T. J.

AU - Johnson, W. N.

AU - Johnston, S.

AU - Kamae, T.

AU - Kanbach, G.

AU - Kaspi, V. M.

AU - Katagiri, H.

AU - Kataoka, J.

AU - Kavelaars, A.

AU - Kawai, N.

AU - Kelly, H.

AU - Kerr, M.

AU - Kiziltan, B.

AU - Klamra, W.

AU - Knödlseder, J.

AU - Kramer, M.

AU - Kuehn, F.

AU - Kuss, M.

AU - Lande, J.

AU - Landriu, D.

AU - Latronico, L.

AU - Lee, B.

AU - Lee, S. H.

AU - Lemoine-Goumard, M.

AU - Livingstone, M.

AU - Longo, F.

AU - Loparco, F.

AU - Lott, B.

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AU - Ziegler, M.

PY - 2009/5/10

Y1 - 2009/5/10

N2 - The Vela pulsar is the brightest persistent source in the GeV sky and thus is the traditional first target for new γ-ray observatories. We report here on initial Fermi Large Area Telescope observations during verification phase pointed exposure and early sky survey scanning. We have used the Vela signal to verify Fermi timing and angular resolution. The high-quality pulse profile, with some 32,400 pulsed photons at E ≥ 0.03GeV, shows new features, including pulse structure as fine as 0.3ms and a distinct third peak, which shifts in phase with energy. We examine the high-energy behavior of the pulsed emission; initial spectra suggest a phase-averaged power-law index of Γ = 1.51+0.05 -0.04 with an exponential cutoff at E c = 2.9 ± 0.1 GeV. Spectral fits with generalized cutoffs of the form require b ≤ 1, which is inconsistent with magnetic pair attenuation, and thus favor outer-magnetosphere emission models. Finally, we report on upper limits to any unpulsed component, as might be associated with a surrounding pulsar wind nebula.

AB - The Vela pulsar is the brightest persistent source in the GeV sky and thus is the traditional first target for new γ-ray observatories. We report here on initial Fermi Large Area Telescope observations during verification phase pointed exposure and early sky survey scanning. We have used the Vela signal to verify Fermi timing and angular resolution. The high-quality pulse profile, with some 32,400 pulsed photons at E ≥ 0.03GeV, shows new features, including pulse structure as fine as 0.3ms and a distinct third peak, which shifts in phase with energy. We examine the high-energy behavior of the pulsed emission; initial spectra suggest a phase-averaged power-law index of Γ = 1.51+0.05 -0.04 with an exponential cutoff at E c = 2.9 ± 0.1 GeV. Spectral fits with generalized cutoffs of the form require b ≤ 1, which is inconsistent with magnetic pair attenuation, and thus favor outer-magnetosphere emission models. Finally, we report on upper limits to any unpulsed component, as might be associated with a surrounding pulsar wind nebula.

KW - gamma rays: observations

KW - pulsars: individual (PSR B0833-45)

UR - http://www.scopus.com/inward/record.url?scp=84863115445&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84863115445&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/696/2/1084

DO - 10.1088/0004-637X/696/2/1084

M3 - Article

AN - SCOPUS:84863115445

SN - 0004-637X

VL - 696

SP - 1084

EP - 1093

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

Fermi large area telescope observations of the vela pulsar

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