Pulsed gamma-rays from PSR j2021+3651 with the Fermi large area telescope

A. A. Abdo; M. Ackermann; M. Ajello; W. B. Atwood; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; M. Battelino; B. M. Baughman; K. Bechtol; R. Bellazzini; B. Berenji; E. D. Bloom; G. Bogaert; A. W. Borgland; 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; C. Cecchi; E. Charles; A. Chekhtman; A. W. Chen; C. C. Cheung; J. Chiang; S. Ciprini; I. Cognard; J. Cohen-Tanugi; L. R. Cominsky; J. Conrad; S. Cutini; P. Demorest; C. D. Dermer; A. De Angelis; A. De Luca; 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; W. B. Focke; M. Frailis; P. C.C. Freire; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; B. Giebels; N. Giglietto; F. Giordano; T. Glanzman; G. Godfrey; I. A. Grenier; M. H. Grondin; J. E. Grove; L. Guillemot; S. Guiriec; Y. Hanabata; A. K. Harding; M. Hayashida; E. Hays; R. E. Hughes; G. Jóhannesson; A. S. Johnson; R. P. Johnson; T. J. Johnson; W. N. Johnson; S. Johnston; T. Kamae; H. Katagiri; J. Kataoka; N. Kawai; M. Kerr; B. Kiziltan; J. Knödlseder; N. Komin; M. Kramer; F. Kuehn; M. Kuss; J. Lande; L. Latronico; S. H. Lee; M. Lemoine-Goumard; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; A. G. Lyne; A. Makeev; R. N. Manchester; M. Marelli; M. N. Mazziotta; W. McConville; J. E. McEnery; M. A. McLaughlin; C. Meurer; P. F. Michelson; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; P. L. Nolan; A. Noutsos; E. Nuss; T. Ohsugi; N. Omodei; E. Orlando; J. F. Ormes; M. Ozaki; D. Paneque; J. H. Panetta; D. Parent; M. Pepe; M. Pesce-Rollins; F. Piron; T. A. Porter; S. Rainò; R. Rando; S. M. Ransom; M. Razzano; A. Reimer; O. Reimer; T. Reposeur; S. Ritz; L. S. Rochester; A. Y. Rodriguez; R. W. Romani; F. Ryde; H. F.W. Sadrozinski; D. Sanchez; P. M.Saz Parkinson; C. Sgrò; A. Sierpowska-Bartosik; E. J. Siskind; D. A. Smith; P. D. Smith; G. Spandre; P. Spinelli; B. W. Stappers; J. L. Starck; M. S. Strickman; D. J. Suson; H. Tajima; H. Takahashi; T. Takahashi; T. Tanaka; J. B. Thayer; J. G. Thayer; G. Theureau; D. J. Thompson; S. E. Thorsett; L. Tibaldo; D. F. Torres; G. Tosti; A. Tramacere; Y. Uchiyama; T. L. Usher; A. Van Etten; N. Vilchez; V. Vitale; A. P. Waite; E. Wallace; K. Watters; P. Weltevrede; K. S. Wood; T. Ylinen; M. Ziegler

doi:10.1088/0004-637X/700/2/1059

Pulsed gamma-rays from PSR j2021+3651 with the Fermi large area telescope

A. A. Abdo, M. Ackermann, M. Ajello, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, M. Battelino, B. M. Baughman, K. Bechtol, R. Bellazzini, B. Berenji, E. D. Bloom, G. Bogaert, A. W. Borgland, J. Bregeon, A. Brez, M. Brigida, P. BruelT. H. Burnett, G. A. Caliandro, R. A. Cameron, F. Camilo, P. A. Caraveo, J. M. Casandjian, C. Cecchi, E. Charles, A. Chekhtman, A. W. Chen, C. C. Cheung, J. Chiang, S. Ciprini, I. Cognard, J. Cohen-Tanugi, L. R. Cominsky, J. Conrad, S. Cutini, P. Demorest, C. D. Dermer, A. De Angelis, A. De Luca, 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, W. B. Focke, M. Frailis, P. C.C. Freire, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, B. Giebels, N. Giglietto, F. Giordano, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, J. E. Grove, L. Guillemot, S. Guiriec, Y. Hanabata, A. K. Harding, M. Hayashida, E. Hays, R. E. Hughes, G. Jóhannesson, A. S. Johnson, R. P. Johnson, T. J. Johnson, W. N. Johnson, S. Johnston, T. Kamae, H. Katagiri, J. Kataoka, N. Kawai, M. Kerr, B. Kiziltan, J. Knödlseder, N. Komin, M. Kramer, F. Kuehn, M. Kuss, J. Lande, L. Latronico, S. H. Lee, M. Lemoine-Goumard, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, A. G. Lyne, A. Makeev, R. N. Manchester, M. Marelli, M. N. Mazziotta, W. McConville, J. E. McEnery, M. A. McLaughlin, C. Meurer, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, P. L. Nolan, A. Noutsos, E. Nuss, T. Ohsugi, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, D. Paneque, J. H. Panetta, D. Parent, M. Pepe, M. Pesce-Rollins, F. Piron, T. A. Porter, S. Rainò, R. Rando, S. M. Ransom, M. Razzano, A. Reimer, O. Reimer, T. Reposeur, S. Ritz, L. S. Rochester, A. Y. Rodriguez, R. W. Romani, F. Ryde, H. F.W. Sadrozinski, D. Sanchez, P. M.Saz Parkinson, C. Sgrò, A. Sierpowska-Bartosik, E. J. Siskind, D. A. Smith, P. D. Smith, G. Spandre, P. Spinelli, B. W. Stappers, J. L. Starck, M. S. Strickman, D. J. Suson, H. Tajima, H. Takahashi, T. Takahashi, T. Tanaka, J. B. Thayer, J. G. Thayer, G. Theureau, D. J. Thompson, S. E. Thorsett, L. Tibaldo, D. F. Torres, G. Tosti, A. Tramacere, Y. Uchiyama, T. L. Usher, A. Van Etten, N. Vilchez, V. Vitale, A. P. Waite, E. Wallace, K. Watters, P. Weltevrede, K. S. Wood, T. Ylinen, M. Ziegler

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

46 Citations (Scopus)

Abstract

We report the detection of pulsed gamma-rays from the young, spin-powered radio pulsar PSR J2021+3651 using data acquired with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). The light curve consists of two narrow peaks of similar amplitude separated by 0.468 0.002 in phase. The first peak lags the maximum of the 2 GHz radio pulse by 0.162 ± 0.004±0.01 in phase. The integral gamma-ray photon flux above 100 MeV is (56±3±11) × 10^-8 cm^-2 s^-1. The photon spectrum is well described by an exponentially cut-off power law of the form , where the energy E is expressed in GeV. The photon index is Γ = 1.5±0.1±0.1 and the exponential cut-off is E_c = 2.4±0.3±0.5 GeV. The first uncertainty is statistical and the second is systematic. The integral photon flux of the bridge is approximately 10% of the pulsed emission, and the upper limit on off-pulse gamma-ray emission from a putative pulsar wind nebula is < 10% of the pulsed emission at the 95% confidence level. Radio polarization measurements yield a rotation measure of RM = 524±4 rad m^-2 but a poorly constrained magnetic geometry. Re-analysis of Chandra X-ray Observatory data enhanced the significance of the weak X-ray pulsations, and the first peak is roughly phase aligned with the first gamma-ray peak. We discuss the emission region and beaming geometry based on the shape and spectrum of the gamma-ray light curve combined with radio and X-ray measurements, and the implications for the pulsar distance. Gamma-ray emission from the polar cap region seems unlikely for this pulsar.

Original language	English
Pages (from-to)	1059-1066
Number of pages	8
Journal	Astrophysical Journal
Volume	700
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/700/2/1059
Publication status	Published - 2009
Externally published	Yes

Keywords

Gamma rays: observations pulsars: general pulsars: individual

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1088/0004-637X/700/2/1059

Cite this

Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Battelino, M., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Bloom, E. D., Bogaert, G., Borgland, A. W., Bregeon, J., Brez, A., Brigida, M., ... Ziegler, M. (2009). Pulsed gamma-rays from PSR j2021+3651 with the Fermi large area telescope. Astrophysical Journal, 700(2), 1059-1066. https://doi.org/10.1088/0004-637X/700/2/1059

Abdo, AA, Ackermann, M, Ajello, M, Atwood, WB, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Battelino, M, Baughman, BM, Bechtol, K, Bellazzini, R, Berenji, B, Bloom, ED, Bogaert, G, Borgland, AW, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Burnett, TH, Caliandro, GA, Cameron, RA, Camilo, F, Caraveo, PA, Casandjian, JM, Cecchi, C, Charles, E, Chekhtman, A, Chen, AW, Cheung, CC, Chiang, J, Ciprini, S, Cognard, I, Cohen-Tanugi, J, Cominsky, LR, Conrad, J, Cutini, S, Demorest, P, Dermer, CD, De Angelis, A, De Luca, A, De Palma, F, Digel, SW, Dormody, M, Do Couto E Silva, E, Drell, PS, Dubois, R, Dumora, D, Espinoza, C, Farnier, C, Favuzzi, C, Focke, WB, Frailis, M, Freire, PCC, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giebels, B, Giglietto, N, Giordano, F, Glanzman, T, Godfrey, G, Grenier, IA, Grondin, MH, Grove, JE, Guillemot, L, Guiriec, S, Hanabata, Y, Harding, AK, Hayashida, M, Hays, E, Hughes, RE, Jóhannesson, G, Johnson, AS, Johnson, RP, Johnson, TJ, Johnson, WN, Johnston, S, Kamae, T, Katagiri, H, Kataoka, J, Kawai, N, Kerr, M, Kiziltan, B, Knödlseder, J, Komin, N, Kramer, M, Kuehn, F, Kuss, M, Lande, J, Latronico, L, Lee, SH, Lemoine-Goumard, M, Longo, F, Loparco, F, Lott, B, Lovellette, MN, Lubrano, P, Lyne, AG, Makeev, A, Manchester, RN, Marelli, M, Mazziotta, MN, McConville, W, McEnery, JE, McLaughlin, MA, Meurer, C, Michelson, PF, Mitthumsiri, W, Mizuno, T, Moiseev, AA, Monte, C, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Nolan, PL, Noutsos, A, Nuss, E, Ohsugi, T, Omodei, N, Orlando, E, Ormes, JF, Ozaki, M, Paneque, D, Panetta, JH, Parent, D, Pepe, M, Pesce-Rollins, M, Piron, F, Porter, TA, Rainò, S, Rando, R, Ransom, SM, Razzano, M, Reimer, A, Reimer, O, Reposeur, T, Ritz, S, Rochester, LS, Rodriguez, AY, Romani, RW, Ryde, F, Sadrozinski, HFW, Sanchez, D, Parkinson, PMS, Sgrò, C, Sierpowska-Bartosik, A, Siskind, EJ, Smith, DA, Smith, PD, Spandre, G, Spinelli, P, Stappers, BW, Starck, JL, Strickman, MS, Suson, DJ, Tajima, H, Takahashi, H, Takahashi, T, Tanaka, T, Thayer, JB, Thayer, JG, Theureau, G, Thompson, DJ, Thorsett, SE, Tibaldo, L, Torres, DF, Tosti, G, Tramacere, A, Uchiyama, Y, Usher, TL, Van Etten, A, Vilchez, N, Vitale, V, Waite, AP, Wallace, E, Watters, K, Weltevrede, P, Wood, KS, Ylinen, T & Ziegler, M 2009, 'Pulsed gamma-rays from PSR j2021+3651 with the Fermi large area telescope', Astrophysical Journal, vol. 700, no. 2, pp. 1059-1066. https://doi.org/10.1088/0004-637X/700/2/1059

@article{3c06f28e115d491ab17b9a1be2f079bc,

title = "Pulsed gamma-rays from PSR j2021+3651 with the Fermi large area telescope",

abstract = "We report the detection of pulsed gamma-rays from the young, spin-powered radio pulsar PSR J2021+3651 using data acquired with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). The light curve consists of two narrow peaks of similar amplitude separated by 0.468 0.002 in phase. The first peak lags the maximum of the 2 GHz radio pulse by 0.162 ± 0.004±0.01 in phase. The integral gamma-ray photon flux above 100 MeV is (56±3±11) × 10-8 cm-2 s-1. The photon spectrum is well described by an exponentially cut-off power law of the form , where the energy E is expressed in GeV. The photon index is Γ = 1.5±0.1±0.1 and the exponential cut-off is Ec = 2.4±0.3±0.5 GeV. The first uncertainty is statistical and the second is systematic. The integral photon flux of the bridge is approximately 10% of the pulsed emission, and the upper limit on off-pulse gamma-ray emission from a putative pulsar wind nebula is < 10% of the pulsed emission at the 95% confidence level. Radio polarization measurements yield a rotation measure of RM = 524±4 rad m-2 but a poorly constrained magnetic geometry. Re-analysis of Chandra X-ray Observatory data enhanced the significance of the weak X-ray pulsations, and the first peak is roughly phase aligned with the first gamma-ray peak. We discuss the emission region and beaming geometry based on the shape and spectrum of the gamma-ray light curve combined with radio and X-ray measurements, and the implications for the pulsar distance. Gamma-ray emission from the polar cap region seems unlikely for this pulsar.",

keywords = "Gamma rays: observations pulsars: general pulsars: individual",

author = "Abdo, {A. A.} and M. Ackermann and M. Ajello and Atwood, {W. B.} and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and M. Battelino and Baughman, {B. M.} and K. Bechtol and R. Bellazzini and B. Berenji and Bloom, {E. D.} and G. Bogaert and Borgland, {A. W.} 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 C. Cecchi and E. Charles and A. Chekhtman and Chen, {A. W.} and Cheung, {C. C.} and J. Chiang and S. Ciprini and I. Cognard and J. Cohen-Tanugi and Cominsky, {L. R.} and J. Conrad and S. Cutini and P. Demorest and Dermer, {C. D.} and {De Angelis}, A. and {De Luca}, A. and {De Palma}, F. and Digel, {S. W.} and M. Dormody and {Do Couto E Silva}, E. and Drell, {P. S.} and R. Dubois and D. Dumora and C. Espinoza and C. Farnier and C. Favuzzi and Focke, {W. B.} and M. Frailis and Freire, {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 B. Giebels and N. Giglietto and F. Giordano and T. Glanzman and G. Godfrey and Grenier, {I. A.} and Grondin, {M. H.} and Grove, {J. E.} and L. Guillemot and S. Guiriec and Y. Hanabata and Harding, {A. K.} and M. Hayashida and E. Hays 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 H. Katagiri and J. Kataoka and N. Kawai and M. Kerr and B. Kiziltan and J. Kn{\"o}dlseder and N. Komin and M. Kramer and F. Kuehn and M. Kuss and J. Lande and L. Latronico and Lee, {S. H.} and M. Lemoine-Goumard and F. Longo and F. Loparco and B. Lott and Lovellette, {M. N.} and P. Lubrano and Lyne, {A. G.} and A. Makeev and Manchester, {R. N.} and M. Marelli and Mazziotta, {M. N.} and W. McConville and McEnery, {J. E.} and McLaughlin, {M. A.} and C. Meurer and Michelson, {P. F.} and W. Mitthumsiri and T. Mizuno and Moiseev, {A. A.} and C. Monte and Monzani, {M. E.} and A. Morselli and Moskalenko, {I. V.} and S. Murgia 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 D. Paneque and Panetta, {J. H.} and D. Parent and M. Pepe and M. Pesce-Rollins and F. Piron and Porter, {T. A.} and S. Rain{\`o} and R. Rando and Ransom, {S. M.} and M. Razzano and A. Reimer and O. Reimer and T. Reposeur and S. Ritz and Rochester, {L. S.} and Rodriguez, {A. Y.} and Romani, {R. W.} and F. Ryde and Sadrozinski, {H. F.W.} and D. Sanchez and Parkinson, {P. M.Saz} and C. Sgr{\`o} and A. Sierpowska-Bartosik and Siskind, {E. J.} and Smith, {D. A.} and Smith, {P. D.} and G. Spandre and P. Spinelli and Stappers, {B. W.} and Starck, {J. L.} and Strickman, {M. S.} and Suson, {D. J.} and H. Tajima and H. Takahashi and T. Takahashi and T. Tanaka and Thayer, {J. B.} and Thayer, {J. G.} and G. Theureau and Thompson, {D. J.} and Thorsett, {S. E.} and L. Tibaldo and Torres, {D. F.} and G. Tosti and A. Tramacere and Y. Uchiyama and Usher, {T. L.} and {Van Etten}, A. and N. Vilchez and V. Vitale and Waite, {A. P.} and E. Wallace and K. Watters and P. Weltevrede and Wood, {K. S.} and T. Ylinen and M. Ziegler",

year = "2009",

doi = "10.1088/0004-637X/700/2/1059",

language = "English",

volume = "700",

pages = "1059--1066",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "2",

}

TY - JOUR

T1 - Pulsed gamma-rays from PSR j2021+3651 with the Fermi large area telescope

AU - Abdo, A. A.

AU - Ackermann, M.

AU - Ajello, M.

AU - Atwood, W. B.

AU - Baldini, L.

AU - Ballet, J.

AU - Barbiellini, G.

AU - Bastieri, D.

AU - Battelino, M.

AU - Baughman, B. M.

AU - Bechtol, K.

AU - Bellazzini, R.

AU - Berenji, B.

AU - Bloom, E. D.

AU - Bogaert, G.

AU - Borgland, A. W.

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 - Cecchi, C.

AU - Charles, E.

AU - Chekhtman, A.

AU - Chen, A. W.

AU - Cheung, C. C.

AU - Chiang, J.

AU - Ciprini, S.

AU - Cognard, I.

AU - Cohen-Tanugi, J.

AU - Cominsky, L. R.

AU - Conrad, J.

AU - Cutini, S.

AU - Demorest, P.

AU - Dermer, C. D.

AU - De Angelis, A.

AU - De Luca, A.

AU - De Palma, F.

AU - Digel, S. W.

AU - Dormody, M.

AU - Do Couto E Silva, E.

AU - Drell, P. S.

AU - Dubois, R.

AU - Dumora, D.

AU - Espinoza, C.

AU - Farnier, C.

AU - Favuzzi, C.

AU - Focke, W. B.

AU - Frailis, M.

AU - Freire, 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 - Giebels, B.

AU - Giglietto, N.

AU - Giordano, F.

AU - Glanzman, T.

AU - Godfrey, G.

AU - Grenier, I. A.

AU - Grondin, M. H.

AU - Grove, J. E.

AU - Guillemot, L.

AU - Guiriec, S.

AU - Hanabata, Y.

AU - Harding, A. K.

AU - Hayashida, M.

AU - Hays, E.

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 - Katagiri, H.

AU - Kataoka, J.

AU - Kawai, N.

AU - Kerr, M.

AU - Kiziltan, B.

AU - Knödlseder, J.

AU - Komin, N.

AU - Kramer, M.

AU - Kuehn, F.

AU - Kuss, M.

AU - Lande, J.

AU - Latronico, L.

AU - Lee, S. H.

AU - Lemoine-Goumard, M.

AU - Longo, F.

AU - Loparco, F.

AU - Lott, B.

AU - Lovellette, M. N.

AU - Lubrano, P.

AU - Lyne, A. G.

AU - Makeev, A.

AU - Manchester, R. N.

AU - Marelli, M.

AU - Mazziotta, M. N.

AU - McConville, W.

AU - McEnery, J. E.

AU - McLaughlin, M. A.

AU - Meurer, C.

AU - Michelson, P. F.

AU - Mitthumsiri, W.

AU - Mizuno, T.

AU - Moiseev, A. A.

AU - Monte, C.

AU - Monzani, M. E.

AU - Morselli, A.

AU - Moskalenko, I. V.

AU - Murgia, S.

AU - Nolan, P. L.

AU - Noutsos, A.

AU - Nuss, E.

AU - Ohsugi, T.

AU - Omodei, N.

AU - Orlando, E.

AU - Ormes, J. F.

AU - Ozaki, M.

AU - Paneque, D.

AU - Panetta, J. H.

AU - Parent, D.

AU - Pepe, M.

AU - Pesce-Rollins, M.

AU - Piron, F.

AU - Porter, T. A.

AU - Rainò, S.

AU - Rando, R.

AU - Ransom, S. M.

AU - Razzano, M.

AU - Reimer, A.

AU - Reimer, O.

AU - Reposeur, T.

AU - Ritz, S.

AU - Rochester, L. S.

AU - Rodriguez, A. Y.

AU - Romani, R. W.

AU - Ryde, F.

AU - Sadrozinski, H. F.W.

AU - Sanchez, D.

AU - Parkinson, P. M.Saz

AU - Sgrò, C.

AU - Sierpowska-Bartosik, A.

AU - Siskind, E. J.

AU - Smith, D. A.

AU - Smith, P. D.

AU - Spandre, G.

AU - Spinelli, P.

AU - Stappers, B. W.

AU - Starck, J. L.

AU - Strickman, M. S.

AU - Suson, D. J.

AU - Tajima, H.

AU - Takahashi, H.

AU - Takahashi, T.

AU - Tanaka, T.

AU - Thayer, J. B.

AU - Thayer, J. G.

AU - Theureau, G.

AU - Thompson, D. J.

AU - Thorsett, S. E.

AU - Tibaldo, L.

AU - Torres, D. F.

AU - Tosti, G.

AU - Tramacere, A.

AU - Uchiyama, Y.

AU - Usher, T. L.

AU - Van Etten, A.

AU - Vilchez, N.

AU - Vitale, V.

AU - Waite, A. P.

AU - Wallace, E.

AU - Watters, K.

AU - Weltevrede, P.

AU - Wood, K. S.

AU - Ylinen, T.

AU - Ziegler, M.

PY - 2009

Y1 - 2009

N2 - We report the detection of pulsed gamma-rays from the young, spin-powered radio pulsar PSR J2021+3651 using data acquired with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). The light curve consists of two narrow peaks of similar amplitude separated by 0.468 0.002 in phase. The first peak lags the maximum of the 2 GHz radio pulse by 0.162 ± 0.004±0.01 in phase. The integral gamma-ray photon flux above 100 MeV is (56±3±11) × 10-8 cm-2 s-1. The photon spectrum is well described by an exponentially cut-off power law of the form , where the energy E is expressed in GeV. The photon index is Γ = 1.5±0.1±0.1 and the exponential cut-off is Ec = 2.4±0.3±0.5 GeV. The first uncertainty is statistical and the second is systematic. The integral photon flux of the bridge is approximately 10% of the pulsed emission, and the upper limit on off-pulse gamma-ray emission from a putative pulsar wind nebula is < 10% of the pulsed emission at the 95% confidence level. Radio polarization measurements yield a rotation measure of RM = 524±4 rad m-2 but a poorly constrained magnetic geometry. Re-analysis of Chandra X-ray Observatory data enhanced the significance of the weak X-ray pulsations, and the first peak is roughly phase aligned with the first gamma-ray peak. We discuss the emission region and beaming geometry based on the shape and spectrum of the gamma-ray light curve combined with radio and X-ray measurements, and the implications for the pulsar distance. Gamma-ray emission from the polar cap region seems unlikely for this pulsar.

AB - We report the detection of pulsed gamma-rays from the young, spin-powered radio pulsar PSR J2021+3651 using data acquired with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). The light curve consists of two narrow peaks of similar amplitude separated by 0.468 0.002 in phase. The first peak lags the maximum of the 2 GHz radio pulse by 0.162 ± 0.004±0.01 in phase. The integral gamma-ray photon flux above 100 MeV is (56±3±11) × 10-8 cm-2 s-1. The photon spectrum is well described by an exponentially cut-off power law of the form , where the energy E is expressed in GeV. The photon index is Γ = 1.5±0.1±0.1 and the exponential cut-off is Ec = 2.4±0.3±0.5 GeV. The first uncertainty is statistical and the second is systematic. The integral photon flux of the bridge is approximately 10% of the pulsed emission, and the upper limit on off-pulse gamma-ray emission from a putative pulsar wind nebula is < 10% of the pulsed emission at the 95% confidence level. Radio polarization measurements yield a rotation measure of RM = 524±4 rad m-2 but a poorly constrained magnetic geometry. Re-analysis of Chandra X-ray Observatory data enhanced the significance of the weak X-ray pulsations, and the first peak is roughly phase aligned with the first gamma-ray peak. We discuss the emission region and beaming geometry based on the shape and spectrum of the gamma-ray light curve combined with radio and X-ray measurements, and the implications for the pulsar distance. Gamma-ray emission from the polar cap region seems unlikely for this pulsar.

KW - Gamma rays: observations pulsars: general pulsars: individual

UR - http://www.scopus.com/inward/record.url?scp=68949200058&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=68949200058&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/700/2/1059

DO - 10.1088/0004-637X/700/2/1059

M3 - Article

AN - SCOPUS:68949200058

SN - 0004-637X

VL - 700

SP - 1059

EP - 1066

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

Pulsed gamma-rays from PSR j2021+3651 with the Fermi large area telescope

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