NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
PSR J0007+7303 in the CTA1I Supenova Remnant: New Gamma-Ray Results from Two Years of Fermi Large Area Telescope ObservationsOne of the main results of the Fermi Gamma-Ray Space Telescope is the discovery of -ray selected pulsars. The high magnetic field pulsar, PSR J0007+7303 in CTA1, was the first ever to be discovered through its -ray pulsations. Based on analysis of two years of Large Area Telescope (LAT) survey data, we report on the discovery of -ray emission in the off-pulse phase interval at the 6 level. The emission appears to be extended at the 2 level with a disk of extension 0.6. level. The flux from this emission in the energy range E 100 MeV is F 100 = (1.73 0.40stat 0.18sys) 108photonscm2 s1 and is best fitted by a power law with a photon index of = 2.54 0.14stat 0.05sys. The pulsed -ray flux in the same energy range is F 100 = (3.95 0.07stat 0.30sys) 107photonscm2 s1 and is best fitted by an exponentially cutoff power-law spectrum with a photon index of = 1.41 0.23stat 0.03sys and a cutoff energy Ec = 4.04 0.20stat 0.67sysGeV. We find no flux variability either at the 2009 May glitch or in the long-term behavior. We model the -ray light curve with two high-altitude emission models, the outer gap and slot gap, and find that the preferred model depends strongly on the assumed origin of the off-pulse emission. Both models favor a large angle between the magnetic axis and observer line of sight, consistent with the nondetection of radio emission being a geometrical effect. Finally, we discuss how the LAT results bear on the understanding of the cooling of this neutron star.
Document ID
20120006852
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Abdo, A.
(George Mason Univ. Fairfax, VA, United States)
Wood, K.
(Naval Research Lab. Washington, DC, United States)
DeCesar, M.
(Maryland Univ. College Park, MD, United States)
Gargano, F.
(Istituto Nazionale di Fisica Nucleare Bari, Italy)
Giordano, F.
(Istituto Nazionale di Fisica Nucleare Bari, Italy)
Ray, P. S.
(Naval Research Lab. Washington, DC, United States)
Parent, D.
(George Mason Univ. Fairfax, VA, United States)
Harding, A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Coleman, M.
(Maryland Univ. College Park, MD, United States)
Wood, D. L.
(Praxis, Inc. Alexandria, VA, United States)
Wolff, M.
(Naval Research Lab. Washington, DC, United States)
Date Acquired
August 25, 2013
Publication Date
January 10, 2012
Publication Information
Publication: The Astrophysical Journal
Volume: 744
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: N000173-08-2-C004
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available