The Fermi LAT detection of magnetar-like pulsar PSR J1846-0258 at high-energy gamma-rays

Abstract

We report the detection of the pulsed signal of the radio-quiet magnetar-like pulsar PSR J1846-0258 in the high-energy \gr-ray data of the Fermi Large Area Telescope (Fermi LAT). We produced phase-coherent timing models exploiting RXTE PCA and Swift XRT monitoring data for the post- (magnetar-like) outburst period from 2007 August 28 to 2016 September 4, with independent verification using INTEGRAL ISGRI and Fermi GBM data. Phase-folding barycentric arrival times of selected Fermi LAT events from PSR J1846-0258, resulted in a 4.2 sigma detection (30--100 MeV) of a broad pulse consistent in shape and aligned in phase with the profiles that we measured with Swift XRT (2.5--10 keV), INTEGRAL ISGRI (20--150 keV) and Fermi GBM (20--300 keV). The pulsed flux (30--100 MeV) is (3.91 +/- 0.97)E-9 photons/(cm^2 s MeV). Declining significances of the INTEGRAL ISGRI 20--150 keV pulse profiles suggest fading of the pulsed hard X-ray emission during the post-outburst epochs. We revisited with greatly improved statistics the timing and spectral characteristics of PSR B1509-58 as measured with the Fermi LAT. The broad-band pulsed emission spectra (from 2 keV up to GeV energies) of PSR J1846-0258 and PSR B1509-58 can be accurately described with similarly curved shapes, with maximum luminosities at 3.5 +/- 1.1 MeV (PSR J1846-0258) and 2.23 +/- 0.11 MeV (PSR B1509-58). We discuss possible explanations for observational differences between Fermi LAT detected pulsars that reach maximum luminosities at GeV energies, like the second magnetar-like pulsar PSR J1119-6127, and pulsars with maximum luminosities at MeV energies, which might be due to geometric differences rather than exotic physics in high-B fields.

13 pages, 8 figures, accepted by MNRAS on 2017 November 30

References in corpus (6)

• Magnetar-like Emission from the Young Pulsar in Kes 75
• Ground-based calibration and characterization of the Fermi Gamma-Ray Burst Monitor Detectors
• The soft gamma-ray pulsar population: an high-energy overview
• Test of the Formation mechanism of the Broad Line Region in Active Galactic Nuclei
• No detectable radio emission from the magnetar-like pulsar in Kes 75
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Cited by in corpus (14)

• The Third Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
• High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst
• Timing six energetic rotation-powered X-ray pulsars, including the fast-spinning young PSR J0058-7218 and Big Glitcher PSR J0537-6910
• Spectral characterization of the non-thermal X-ray emission of gamma-ray pulsars
• X-ray Spectroscopy of the Highly Magnetized Pulsar PSR J1846-0258, its Wind Nebula and Hosting Supernova Remnant Kes 75
• The INTEGRAL view of the pulsating hard X-ray sky: from accreting and transitional millisecond pulsars to rotation-powered pulsars and magnetars
• Discovery of GeV gamma-ray emission from PWN Kes 75 and PSR J1846-0258
• A NICER View on the 2020 Magnetar-Like Outburst of PSR J1846-0258
• Synchro-curvature emitting regions in high-energy pulsar models
• Observational connection of non-thermal X-ray emission from pulsars with their timing properties and thermal emission
• The power-law component of the X-ray emissions from pulsar wind nebulae and their pulsars
• The Vela pulsar and its pulsar wind nebula Vela-X using 13 years of Fermi-LAT Observations
• Spatio-spectral-temporal Modelling of Two Young Pulsar Wind Nebulae
• Multiwavelength Radiation from the Interaction between Magnetar Bursts and Companion Star in a Binary System