A DETAILED X-RAY INVESTIGATION OF PSR J2021+4026 AND THE γ-CYGNI SUPERNOVA REMNANT

We have investigated the field around the radio-quiet gamma -ray pulsar, PSR J2021+4026, with a ~140 ks XMM-Newton observation and ~56 ks archival Chandra data. In re-analyzing the Chandra data, we have confirmed the presence of a bow-shock nebula that extends from the pulsar to the west by ~10 arcs...

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Bibliographic Details
Published in:The Astrophysical journal 2015-01, Vol.799 (1), p.1-15
Main Authors: Hui, C Y, Seo, K A, Lin, L C C, Huang, R H H, Hu, C P, Wu, J H K, Trepl, L, Takata, J, Wang, Y, Chou, Y, Cheng, K S, Kong, A K H
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COMPARATIVE EVALUATIONS
Emission
Extrapolation
IONIZATION
NEBULAE
NEUTRON STARS
NEUTRONS
Orientation
PHOTONS
PROPER MOTION
PULSARS
PULSATIONS
SHOCK WAVES
STELLAR WINDS
SUPERNOVA REMNANTS
SUPERNOVAE
X RADIATION
X-rays
XMM (spacecraft)
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Summary:We have investigated the field around the radio-quiet gamma -ray pulsar, PSR J2021+4026, with a ~140 ks XMM-Newton observation and ~56 ks archival Chandra data. In re-analyzing the Chandra data, we have confirmed the presence of a bow-shock nebula that extends from the pulsar to the west by ~10 arcsec. The orientation of this nebular feature suggests that the pulsar is probably moving eastward, which is consistent with the speculated proper motion by extrapolating from the nominal geometrical center of the supernova remnant (SNR) G78.2+2.1 to the current pulsar position. The remnant emission in both of the examined regions is in a non-equilibrium ionization state. Also, the elapsed time of both regions after shock-heating is apparently shorter than the Sedov age of G78.2+2.1. This might suggest that the reverse shock has reached the center not long ago. Apart from PSR J2021+4026 and G78.2+2.1, we have also serendipitously detected an X-ray flash-like event, XMM J202154.7+402855, from this XMM-Newton observation.
ISSN:1538-4357
0004-637X
1538-4357
DOI:10.1088/0004-637X/799/1/76