PSR J2021+4026 IN THE GAMMA CYGNI REGION: THE FIRST VARIABLE γ-RAY PULSAR SEEN BY THE Fermi LAT

PSR J2021+4026 IN THE GAMMA CYGNI REGION: THE FIRST VARIABLE γ-RAY PULSAR SEEN BY THE Fermi LAT

Long-term monitoring of PSR J2021+4026 in the heart of the Cygnus region with the Fermi Large Area Telescope unveiled a sudden decrease in flux above 100 MeV over a timescale shorter than a week. The "jump" was near MJD 55850 (2011 October 16), with the flux decreasing from (8.33 + or - 0....

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Veröffentlicht in:Astrophysical journal. Letters 2013-11, Vol.777 (1), p.1-8
Hauptverfasser: ALLAFORT, A, Baldini, L, Ballet, J, Barbiellini, G, Baring, M G, BASTIERI, D, Bellazzini, R, Bonamente, E, Bottacini, E, Brandt, T J
Format: Artikel
Sprache:eng
Schlagworte:
ASTRONOMY AND ASTROPHYSICS
Astrophysics
Emission
Flux
gamma rays: stars
High Energy Astrophysical Phenomena
Inclination
Magnetic fields
Monitoring
Physics
Pulsars
pulsars: individual (PSR J2021+4026)
Sciences of the Universe
stars: neutron
Telescopes
Wavelengths
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Zusammenfassung:Long-term monitoring of PSR J2021+4026 in the heart of the Cygnus region with the Fermi Large Area Telescope unveiled a sudden decrease in flux above 100 MeV over a timescale shorter than a week. The "jump" was near MJD 55850 (2011 October 16), with the flux decreasing from (8.33 + or - 0.08) x 10 super(-10) erg cm super(-2) s super(-1) to (6.86+ or -0.13) x 10 super(-10) erg cm super(-2) s super(-1). Simultaneously, the frequency spindown rate increased from (7.8 + or - 0.1) x 10 super(-13) Hz s super(-1) to (8.1 + or - 0.1) x 10 super(-13) Hz s super(-1). Significant (>5[sigma]) changes in the pulse profile and marginal (
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/777/1/L2