%0 Journal Article
%T Discovery of gamma- and X-ray pulsations from the young and energetic PSR J1357−6429 with Fermi and XMM-Newton
%+ GLAST
%+ Laboratoire Univers et Particules de Montpellier (LUPM)
%A Lemoine-Goumard, M.
%A E. Zavlin, V.
%A Grondin, M.-H.
%A Shannon, R.
%A Smith, David Stanley
%A Burgay, M.
%A Camilo, F.
%A Cohen-Tanugi, J.
%A C. C. Freire, P.
%A E. Grove, J.
%A Guillemot, L.
%A Johnston, S.
%A Keith, M.
%A Kramer, M.
%A N. Manchester, R.
%A F. Michelson, P.
%A Parent, D.
%A Possenti, A.
%A S. Ray, P.
%A Renaud, M.
%A E. Thorsett, S.
%A Weltevrede, P.
%A T. Wolff, M.
%< avec comité de lecture
%@ 0004-6361
%J Astronomy and Astrophysics - A&A
%I EDP Sciences
%V 533
%P A102
%8 2011-09-13
%D 2011
%Z 1108.0161
%R 10.1051/0004-6361/201117413
%K pulsars: individual: PSR J1357
%K 6429
%K gamma rays: general
%K pulsars: general
%Z Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]Journal articles
%X Since the launch of the Fermi satellite, the number of known gamma-ray pulsars has increased tenfold. Most gamma-ray detected pulsars are young and energetic, and many are associated with TeV sources. PSR J1357-6429 is a high spin-down power pulsar (Edot = 3.1 * 10^36 erg/s), discovered during the Parkes multibeam survey of the Galactic plane, with significant timing noise typical of very young pulsars. In the very-high-energy domain, H.E.S.S. has reported the detection of the extended source HESS J1356-645 (intrinsic Gaussian width of 12') whose centroid lies 7' from PSR J1357-6429. Using a rotational ephemeris obtained with 74 observations made with the Parkes telescope at 1.4 GHz, we phase-fold more than two years of gamma-ray data acquired by Fermi-LAT as well as those collected with XMM-Newton, and perform gamma-ray spectral modeling. Significant gamma and X-ray pulsations are detected from PSR J1357-6429. The light curve in both bands shows one broad peak. Gamma-ray spectral analysis of the pulsed emission suggests that it is well described by a simple power-law of index 1.5 +/- 0.3stat +/- 0.3syst with an exponential cut-off at 0.8 +/- 0.3stat +/- 0.3syst GeV and an integral photon flux above 100 MeV of (6.5 +/- 1.6stat +/- 2.3syst) * 10^-8 cm^-2 s^-1. The X-ray spectra obtained from the new data provide results consistent with those reported by Zavlin (2007). Upper limits on the gamma-ray emission from its potential pulsar wind nebula (PWN) are also reported. Assuming a distance of 2.4 kpc, the Fermi LAT energy flux yields a gamma-ray luminosity for PSR J1357-6429 of L_gamma = (2.13 +/- 0.25stat +/- 0.83syst) * 10^34 erg/s, consistent with an L_gamma \propto sqrt(Edot) relationship. The Fermi non-detection of the pulsar wind nebula associated with HESS J1356-645 provides new constraints on the electron population responsible for the extended TeV emission.
%G English
%L in2p3-00656586
%U https://hal.in2p3.fr/in2p3-00656586
%~ IN2P3
%~ CENBG
%~ CNRS
%~ UNIV-MONTP2
%~ LUPM
%~ MIPS
%~ UNIV-MONTPELLIER
%~ LUPM_EMA
%~ UM1-UM2