A search for the radio counterpart of the unidentified gamma-ray source 3EG J1410-6147

M. Doherty; S. Johnston; A. J. Green; M. S. E. Roberts; R. W. Romani; B. M. Gaensler; F. Crawford

doi:10.1046/j.1365-8711.2003.06265.x

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A search for the radio counterpart of the unidentified gamma-ray source 3EG J1410-6147

M. Doherty·S. Johnston·A. J. Green·M. S. E. Roberts·R. W. Romani·B. M. Gaensler·F. Crawford

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Abstract

We have made radio continuum, HI and X-ray observations in the direction of the unidentified EGRET source 3EG J1410-6147, using the Australia Telescope Compact Array and the Chandra X-ray Observatory. The observations encompass the supernova remnant (SNR) G312.4-0.4 and the two young pulsars PSRs J1412-6145 and J1413-6141. We derive a lower distance limit of 6 kpc to the SNR, although interpretation of positive velocity features in the HI spectrum may imply the SNR is more distant than 14 kpc. PSR J1412-6145, with an age of 50 kyr, is the pulsar most likely associated with SNR G312.4-0.4. X-rays are not detected from either pulsar and diffuse X-ray emission near the bright western edge of the SNR is weak. Although there is circumstantial evidence that this western region is a pulsar wind nebula (PWN), the embedded pulsar PSR J1412-6145 is apparently not sufficiently powerful to explain the radio enhancement. The origin of the electron acceleration in this region and of the gamma-rays remain unidentified, unless the distance to PSR J1413-6141 is at least a factor of 3 lower than its dispersion measure distance.

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M. Doherty, S. Johnston, A. J. Green, M. S. E. Roberts, R. W. Romani, B. M. Gaensler, F. Crawford. 2002-11-13. A search for the radio counterpart of the unidentified gamma-ray source 3EG J1410-6147. https://doi.org/10.1046/j.1365-8711.2003.06265.x

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