Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

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
Alternate ID(s):
OSTI ID: 22004200
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 744; ISSN 0004-637X
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

References (33)

Neutrino emission from neutron stars journal November 2001
The on-orbit calibration of the Fermi Large Area Telescope journal October 2009
A candidate gamma-ray pulsar in the supernova remnant CTA 1 journal April 1998
The supernova remnant CTA1 and the surrounding interstellar medium journal March 1993
Parameter estimation in X-ray astronomy journal August 1976
Gamma-ray pulsars: Emission zones and viewing geometries journal January 1995
X-Ray Emission from the Supernova Remnant CTA 1 journal November 1995
The Likelihood Analysis of EGRET Data journal April 1996
Nonthermal X‐Ray Emission from CTA 1 journal August 1997
First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Parameter Estimation Methodology journal September 2003
X‐Ray Observations of the Compact Source in CTA 1 journal February 2004
High‐Altitude Particle Acceleration and Radiation in Pulsar Slot Gaps journal May 2004
Relativistic Effects and Polarization in Three High‐Energy Pulsar Models journal May 2004
X‐Ray, Radio, and Optical Observations of the Putative Pulsar in the Supernova Remnant CTA 1 journal September 2004
Population Synthesis of Radio and γ‐Ray Millisecond Pulsars from the Galactic Disk journal December 2007
A Search for Radio‐Quiet Gamma‐Ray Pulsars in EGRET Data Using a Time‐Differencing Technique journal June 2008
An Atlas for Interpreting γ-Ray Pulsar Light Curves journal April 2009
THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION journal May 2009
Neutrino Emission from Cooper Pairs and Minimal Cooling of Neutron Stars journal December 2009
PSR J1907+0602: A RADIO-FAINT GAMMA-RAY PULSAR POWERING A BRIGHT TeV PULSAR WIND NEBULA journal February 2010
Constraining Pulsar Magnetosphere Geometry with γ-Ray Light Curves journal April 2010
FERMI LARGE AREA TELESCOPE OBSERVATIONS OF GAMMA-RAY PULSARS PSR J1057–5226, J1709–4429, AND J1952+3252 journal August 2010
FERMI -LAT SEARCH FOR PULSAR WIND NEBULAE AROUND GAMMA-RAY PULSARS journal December 2010
THE FIRST FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS journal March 2010
FERMI LARGE AREA TELESCOPE FIRST SOURCE CATALOG journal May 2010
PRECISE γ-RAY TIMING AND RADIO OBSERVATIONS OF 17 FERMI γ-RAY PULSARS journal April 2011
TEMPO2: a New Pulsar Timing Package journal October 2006
Detection of an X-Ray Pulsation for the Gamma-Ray Pulsar Centered in cta 1 journal November 2010
X-Ray Pulsations from the Radio-Quiet Gamma-Ray Pulsar in cta 1 journal November 2010
Pulsar pair Cascades in a Distorted Magnetic Dipole Field journal December 2010
The Fermi Gamma-Ray Space Telescope Discovers the Pulsar in the Young Galactic Supernova Remnant CTA 1 journal November 2008
Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT journal July 2009
Gamma-Ray Flares from the Crab Nebula journal January 2011

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

Similar Records

PSR J0007+7303 IN THE CTA1 SUPERNOVA REMNANT: NEW GAMMA-RAY RESULTS FROM TWO YEARS OF FERMI LARGE AREA TELESCOPE OBSERVATIONS
Journal Article · Mon Jan 09 23:00:00 EST 2012 · Astrophysical Journal · OSTI ID:22004200
Gamma-ray emission from PSR J0007+7303 using seven year
Journal Article · Sun Oct 23 20:00:00 EDT 2016 · The Astrophysical Journal (Online) · OSTI ID:1355711
GAMMA-RAY EMISSION FROM PSR J0007+7303 USING SEVEN YEARS OF FERMI LARGE AREA TELESCOPE OBSERVATIONS
Journal Article · Tue Nov 01 00:00:00 EDT 2016 · Astrophysical Journal · OSTI ID:22667279

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS