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The Chandra X-ray Observatory Resolves the X-ray Morphology and Spectra of a Jet in PKS 0637-752

G. Chartas·D. M. Worrall·M. Birkinshaw·M. Cresitello-Dittmar·W. Cui·K. K. Ghosh·D. E. Harris·E. J. Hooper·D. L. Jauncey·D. - W. Kim·J. Lovell·H. L. Marshall·S. Mathur·D. A. Schwartz·S. J. Tingay·S. N. Virani·B. J. Wilkes
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Abstract

The core-dominated radio-loud quasar PKS 0637-752 (z = 0.654) was the first celestial object observed with the Chandra X-ray Observatory, offering the early surprise of the detection of a remarkable X-ray jet. Several observations with a variety of detector configurations contribute to a total exposure time with the Chandra Advanced CCD Imaging Spectrometer (ACIS; Garmire et al. 2000, in preparation) of about 100ks. A spatial analysis of all the available X-ray data, making use of Chandra's spatial resolving power of about 0.4 arcsec, reveals a jet that extends about 10 arcsec to the west of the nucleus. At least four X-ray knots are resolved along the jet, which contains about 5% of the overall X-ray luminosity of the source. Previous observations of PKS 0637-752 in the radio band (Tingay et al. 1998) had identified a kpc-scale radio jet extending to the West of the quasar. The X-ray and radio jets are similar in shape, intensity distribution, and angular structure out to about 9 arcsec, after which the X-ray brightness decreases more rapidly and the radio jet turns abruptly to the north. The X-ray luminosity of the total source is log Lx ~ 45.8 erg/s (2 - 10keV), and appears not to have changed since it was observed with ASCA in November 1996. We present the results of fitting a variety of emission models to the observed spectral distribution, comment on the non-existence of emission lines recently reported in the ASCA observations of PKS 0637-752, and briefly discuss plausible X-ray emission mechanisms.

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G. Chartas, D. M. Worrall, M. Birkinshaw, M. Cresitello-Dittmar, W. Cui, K. K. Ghosh, D. E. Harris, E. J. Hooper, D. L. Jauncey, D. - W. Kim, J. Lovell, H. L. Marshall, S. Mathur, D. A. Schwartz, S. J. Tingay, S. N. Virani, B. J. Wilkes. 2000-05-10. The Chandra X-ray Observatory Resolves the X-ray Morphology and Spectra of a Jet in PKS 0637-752. https://doi.org/10.1086/317049

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