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Title: PSR J0007+7303 In The CTA1 Supernova Remnant: New Gamma-Ray Results From Two Years Of Fermi Large Area Telescope Observations

Journal Article · · The Astrophysical Journal
 [1];  [2];  [3];  [4];  [5];  [2];  [1];  [6];  [7];  [8];  [2]
  1. George Mason Univ., Fairfax, VA (United States); Naval Research Lab. (NRL), Washington, DC (United States)
  2. Naval Research Lab. (NRL), Washington, DC (United States)
  3. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States)
  4. Istituto Nazionale di Fisica Nucleare (INFN), Bari (Italy)
  5. Istituto Nazionale di Fisica Nucleare (INFN), Bari (Italy); Univ. e del Politecnico di Bari (Italy)
  6. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  7. Univ. of Maryland, College Park, MD (United States)
  8. Praxis Inc., Alexandria, VA (United States); Naval Research Lab. (NRL), Washington, DC (United States)
+ Show Author Affiliations

One of the main results of the Fermi Gamma-Ray Space Telescope is the discovery of γ-ray selected pulsars. The high magnetic field pulsar, PSR J0007+7303 in CTA1, was the first ever to be discovered through its γ-ray pulsations. Based on analysis of 2 years of LAT survey data, we report on the discovery of γ-ray emission in the off-pulse phase interval at the ~ 6σ level. The flux from this emission in the energy range E ≥ 100 MeV is F100 = (1.73±0.40)×10-8 photons cm-2 s-1 and is best fitted by a power law with a photon index of Γ = 2.54±0.14. The pulsed -ray flux in the same energy range is F100 = (3.95±0.07)×10-7 photons cm-2 s-1 and is best fitted by an exponentially-cutoff power-law spectrum with a photon index of Γ = 1.41 ± 0.23 and a cutoff energy Ec = 4.04 ± 0.20 GeV. We find no flux variability neither at the 2009 May glitch nor in the long term behavior. We model the γ-ray light curve with two high-altitude emission models, the outer gap and slot gap, and find that the model that best fits the data 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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1356766
Journal Information:
The Astrophysical Journal, Vol. 744, Issue 2; ISSN 0004-637X
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

References (33)

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Cited By (10)

Nuclear Equation of State for Compact Stars and Supernovae book January 2018
THE SECOND FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS journal September 2013
An analytic approach for the study of pulsar spindown journal June 2018
Molecular environment, reverberation, and radiation from the pulsar wind nebula in CTA 1 journal April 2016
Prospects for the detection of high-energy (E > 25 GeV) Fermi pulsars with the Cherenkov Telescope Array journal June 2017
Optical detection of the black widow binary PSR J2052+1219 journal September 2019
The Second Fermi Large area Telescope Catalog of Gamma-Ray Pulsars text January 2013
Molecular environment, reverberation, and radiation from the pulsar wind nebula in CTA 1 text January 2016
Molecular environment, reverberation, and radiation from the pulsar wind nebula in CTA 1 text January 2016
Nuclear Equation of state for Compact Stars and Supernovae text January 2018

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