The Identification of the X-ray Counterpart to PSR J2021+4026

Abstract

We report the probable identification of the X-ray counterpart to the gamma-ray pulsar PSR J2021+4026 using imaging with the Chandra X-ray Observatory ACIS and timing analysis with the Fermi satellite. Given the statistical and systematic errors, the positions determined by both satellites are coincident. The X-ray source position is R.A. 20h21m30.733s, Decl. +40 deg 26 min 46.04sec (J2000) with an estimated uncertainty of 1.3 arsec combined statistical and systematic error. Moreover, both the X-ray to gamma-ray and the X-ray to optical flux ratios are sensible assuming a neutron star origin for the X-ray flux. The X-ray source has no cataloged infrared-to-visible counterpart and, through new observations, we set upper limits to its optical emission of i' >23.0 mag and r' > 25.2mag. The source exhibits an X-ray spectrum with most likely both a powerlaw and a thermal component. We also report on the X-ray and visible light properties of the 43 other sources detected in our Chandra observation.

Accepted for publication in the Astrophysical Journal

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Cited by in corpus (13)

• The Second Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
• PSR J2021+4026 in the Gamma Cygni region: the first variable gamma-ray pulsar seen by the Fermi LAT
• Gamma-ray Pulsar Revolution
• Timing Gamma-ray Pulsars with the Fermi Large Area Telescope: Timing Noise and Astrometry
• Discovery of X-ray Pulsation from the Geminga-like Pulsar PSR J2021+4026
• Mode change of a gamma-ray pulsar, PSR J2021+4026
• A detailed X-ray investigation of PSR J2021+4026 and $\gamma$-Cygni supernova remnant
• Multiwavelength observations of PSR J2021+4026 across a mode change reveal a phase shift in its X-ray emission
• X-ray study of Variable Gamma-ray Pulsar PSR J2021+4026
• Modeling the non-recycled Fermi gamma-ray pulsar population
• AGILE study of the gamma-ray emission from the SNR G78.2+2.1 (Gamma Cygni)
• X-ray observations and the search for Fermi-LAT gamma-ray pulsars
• Search for gamma-ray variability around Fermi-LAT pulsar glitches