A Galactic microblazar as a potential accelerator of ultra-high-energy particles
Abstract
Context. Persistent jets from X-ray binaries which are aligned very close to the line of sight could be considered to be Galactic equivalents of blazars, or 'microblazars'. They are also expected to power gamma-ray sources. Aims. We intend to assess a serious candidate apparently fulfilling many of the requirements to be considered a genuine member of this class: IRAS 18293-0941. Methods. An intense multi-wavelength observational and theoretical study has been carried out on our proposed candidate source. Results. With photometric and spectroscopic properties typical of a binary star, this system exhibits clear collimated and one-sided radio emission matching the effects of relativistic motion along a reduced ejection angle. Only fast variability is not observed possibly smoothed by a dense circumstellar envelope. A physical scenario is consistently modeled that also gives credibility to its likely connection with LHAASO J1831-1007u*, an ultra-high-energy source in its immediate vicinity. Conclusions. Our reported identification not only helps to fill a gap in Galactic taxonomy, but also potentially strengthens the role of the microblazar and microquasar families in our understanding of the most energetic Milky Way phenomena.
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BibTeX
@misc{marti2026galactic,
title = {{A Galactic microblazar as a potential accelerator of ultra-high-energy particles}},
author = {Josep Martí and Pedro L. Luque-Escamilla and Benito Marcote and Leandro Abaroa and Arnau Aguasca-Cabot and Jorge A. Combi and Gustavo E. Romero and Josep M. Paredes and Federico García and Federico Fogantini and Enzo A. Saavedra and Daniel del Ser and Jakob van den Eijnden},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.00990},
eprint = {2609.00990},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.00990},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - A Galactic microblazar as a potential accelerator of ultra-high-energy particles
AU - Josep Martí
AU - Pedro L. Luque-Escamilla
AU - Benito Marcote
AU - Leandro Abaroa
AU - Arnau Aguasca-Cabot
AU - Jorge A. Combi
AU - Gustavo E. Romero
AU - Josep M. Paredes
AU - Federico García
AU - Federico Fogantini
AU - Enzo A. Saavedra
AU - Daniel del Ser
AU - Jakob van den Eijnden
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.00990
UR - https://arxiv.org/abs/2609.00990
AB - Context. Persistent jets from X-ray binaries which are aligned very close to the line of sight could be considered to be Galactic equivalents of blazars, or 'microblazars'. They are also expected to power gamma-ray sources. Aims. We intend to assess a serious candidate apparently fulfilling many of the requirements to be considered a genuine member of this class: IRAS 18293-0941. Methods. An intense multi-wavelength observational and theoretical study has been carried out on our proposed candidate source. Results. With photometric and spectroscopic properties typical of a binary star, this system exhibits clear collimated and one-sided radio emission matching the effects of relativistic motion along a reduced ejection angle. Only fast variability is not observed possibly smoothed by a dense circumstellar envelope. A physical scenario is consistently modeled that also gives credibility to its likely connection with LHAASO J1831-1007u*, an ultra-high-energy source in its immediate vicinity. Conclusions. Our reported identification not only helps to fill a gap in Galactic taxonomy, but also potentially strengthens the role of the microblazar and microquasar families in our understanding of the most energetic Milky Way phenomena.
ER -