PULSED GAMMA-RAYS FROM PSR J2021+3651 WITH THE FERMI LARGE AREA TELESCOPE

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 CM, 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, Johannesson G, Johnson AS, Johnson RP, Johnson TJ, Johnson WN, Johnston S, Kamae T, Katagiri H, Kataoka J, Kawai N, Kerr M, Kiziltan B, Knoedlseder J, Komin N, Kramer M, Kuehn F, Kuss MW, 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, Raino 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, Sgro 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 HH, 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)

Publication Type: Journal article

Publication year: 2009

Journal

Book Volume: 700

Pages Range: 1059-1066

Journal Issue: 2

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

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) x 10(-8) cm(-2) s(-1). The photon spectrum is well described by an exponentially cut-off power law of the form dF/dE = kE(-Gamma)e((-E/Ec)), where the energy E is expressed in GeV. The photon index is Gamma = 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.

Authors with CRIS profile

Involved external institutions

National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) Italy (IT) University of Paris 7 - Denis Diderot / Université Paris VII Denis Diderot France (FR) Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH) Sweden (SE) Ohio State University United States (USA) (US) Stanford University United States (USA) (US) U.S. Naval Research Laboratory United States (USA) (US) University of California Santa Cruz United States (USA) (US) National Center for Scientific Research / Centre national de la recherche scientifique (CNRS) France (FR) University of Montpellier / Université Montpellier France (FR) Sonoma State University United States (USA) (US) ASI Science Data Center (ASDC) Italy (IT) National Radio Astronomy Observatory (NRAO) United States (USA) (US) University of Udine / Università degli Studi di Udine Italy (IT) Istituto Universitario Di Studi Superiori Di Pavia Italy (IT) Politecnico di Bari Italy (IT) University of Manchester United Kingdom (GB) Hiroshima University Japan (JP) National Aeronautics and Space Administration (NASA) United States (USA) (US) École Polytechnique - Université Paris-Saclay France (FR) University of Washington United States (USA) (US) Columbia University United States (USA) (US) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) Italy (IT) Université Bordeaux 1, Sciences et Technologies France (FR) Arecibo Observatory United States (USA) (US) Commonwealth Scientific and Industrial Research Organisation (CSIRO) Australia (AU) Tokyo Institute of Technology Japan (JP) Riken Institute of Physical and Chemical Research / 理研 Japan (JP) Université Toulouse III - Paul Sabatier France (FR) George Mason University United States (USA) (US) University of Denver United States (USA) (US) West Virginia University (WVU) United States (USA) (US) Stockholm University / Stockholms universitet Sweden (SE) Max-Planck-Institut für extraterrestrische Physik (MPE) / Max Planck Institute for Extraterrestrial Physics Germany (DE) Japan Aerospace eXploration Agency (JAXA) Japan (JP) Spanish National Research Council / Consejo Superior de Investigaciones Científicas (CSIC) Spain (ES) NYCB Real-Time Computing, Inc. United States (USA) (US) Purdue University Northwest / Purdue University Calumet United States (USA) (US)

How to cite

APA:

Abdo, A.A., Ackermann, M., Ajello, M., Atwood, W.B., Baldini, L., Ballet, J.,... Ziegler, M. (2009). PULSED GAMMA-RAYS FROM PSR J2021+3651 WITH THE FERMI LARGE AREA TELESCOPE. Astrophysical Journal, 700(2), 1059-1066. https://dx.doi.org/10.1088/0004-637X/700/2/1059

MLA:

Abdo, A. A., et al. "PULSED GAMMA-RAYS FROM PSR J2021+3651 WITH THE FERMI LARGE AREA TELESCOPE." Astrophysical Journal 700.2 (2009): 1059-1066.

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