Chandra X-ray imaging and IC/CMB model for the inner jet of PKS 0637-752
Abstract
We present the X-ray surface brightness maps of the jet from the quasar PKS 0637-752, using two epochs of archival Chandra observations (1999 and 2017). We present, for the first time, a model of the faint inner jet extending from 3.4 to 7 arcsec from the core, interpreting its X-ray emission as inverse Compton scattering of cosmic microwave background photons by the synchrotron-emitting relativistic electrons. The inner jet contrasts with the bright outer part of the jet, dominated by several discrete knots for which upper limits to the Fermi gamma-ray flux rule out the inverse Compton mechanism. It is the first detailed inverse Compton model published for this inner jet. We examine three physically motivated scenarios, distinguished by the high-energy cutoff of the electron distribution, that can account for the observed radio, millimeter/submillimeter, and X-ray emission while remaining consistent with optical and gamma-ray upper limits. We also report for the first time X-rays from the radio lobe at the end of the receding jet.
Related
- Chandra X-Ray Imaging and an Inverse Compton/Cosmic Microwave Background Model for the Inner Jet of PKS 0637–752
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- The Chandra-Gaia Catalog of Counterparts: Resolving ambiguous Gaia matches to X-ray sources in the Chandra Source Catalog using Machine Learning
- The thermal emission for knot A of radio galaxy M87 by Chandra
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BibTeX
@misc{maithil2026chandra,
title = {{Chandra X-ray imaging and IC/CMB model for the inner jet of PKS 0637-752}},
author = {Jaya Maithil and Daniel A. Schwartz and Aneta Siemiginowska and Diana M. Worrall and Preeti Kharb},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.06587},
eprint = {2609.06587},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.06587},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Chandra X-ray imaging and IC/CMB model for the inner jet of PKS 0637-752
AU - Jaya Maithil
AU - Daniel A. Schwartz
AU - Aneta Siemiginowska
AU - Diana M. Worrall
AU - Preeti Kharb
PY - 2026
DA - 2026/09/06
PB - arXiv
DO - 10.48550/arxiv.2609.06587
UR - https://arxiv.org/abs/2609.06587
AB - We present the X-ray surface brightness maps of the jet from the quasar PKS 0637-752, using two epochs of archival Chandra observations (1999 and 2017). We present, for the first time, a model of the faint inner jet extending from 3.4 to 7 arcsec from the core, interpreting its X-ray emission as inverse Compton scattering of cosmic microwave background photons by the synchrotron-emitting relativistic electrons. The inner jet contrasts with the bright outer part of the jet, dominated by several discrete knots for which upper limits to the Fermi gamma-ray flux rule out the inverse Compton mechanism. It is the first detailed inverse Compton model published for this inner jet. We examine three physically motivated scenarios, distinguished by the high-energy cutoff of the electron distribution, that can account for the observed radio, millimeter/submillimeter, and X-ray emission while remaining consistent with optical and gamma-ray upper limits. We also report for the first time X-rays from the radio lobe at the end of the receding jet.
ER -