Journal
NATURE ASTRONOMY
Volume 4, Issue 12, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41550-020-1164-6
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Funding
- National Aeronautics and Space Administration
- Department of Energy in the United States
- Commissariat a l'Energie Atomique
- Centre National de la Recherche Scientifique/Institut National de Physique Nucleaire et de Physique des Particules in France
- Agenzia Spaziale Italiana
- Istituto Nazionale di Fisica Nucleare in Italy
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- High Energy Accelerator Research Organization (KEK)
- Japan Aerospace Exploration Agency (JAXA) in Japan
- K. A. Wallenberg Foundation
- Swedish Research Council
- Swedish National Space Board in Sweden
- Istituto Nazionale di Astrofisica in Italy
- Centre National d'Etudes Spatiales in France
- DOE [DE-AC02-76SF00515]
- Alexander von Humboldt Foundation
- National Natural Science Foundation of China [NSFC-11673013, NSFC-11733009]
- COST Action PHAROS [CA16214]
- NASA
- National Science Foundation [AST-1100968]
- NSF
- University of Wisconsin
- University of California
- Ana G. Mendez-Universidad Metropolitana
- Universities Space Research Association
- [PGC2018-095512-B-I00]
- [SGR2017-1383]
- [AYA2017-92402-EXP]
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Microquasars, the local siblings of extragalactic quasars, are binary systems comprising a compact object and a companion star. By accreting matter from their companions, microquasars launch powerful winds and jets, influencing the interstellar environment around them. Steady gamma-ray emission is expected to rise from their central objects, or from interactions between their outflows and the surrounding medium. The latter prediction was recently confirmed with the detection of SS 433 at high (TeV) energies(1). In this report, we analyse more than ten years of gigaelectronvolt gamma-ray data from the Fermi Gamma-ray Space Telescope on this source. Detailed scrutiny of the data reveal emission in the vicinity of SS 433, co-spatial with a gas enhancement, and hints of emission possibly associated with a terminal lobe of one of the jets. Both gamma-ray excesses are relatively far from the central binary, and the former shows evidence of a periodic variation at the precessional period of SS 433, linking it with the microquasar. This result challenges obvious interpretations and is unexpected from previously published theoretical models. It provides us with a chance to unveil the particle transport from SS 433 and to probe the structure of the magnetic field in its vicinity. Ten years of gamma-ray data reveal emission in the vicinity of the microquasar SS 433 that is co-spatial with an interstellar gas enhancement and varies periodically at the precessional period of SS 433, challenging existing theoretical models.
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