A Supernova Remnant Counterpart for HESS J1832-085
| Autor: | Denis Leahy, H. Su, Gavin Rowell, Wenwu Tian, Manami Sasaki, N. Maxted, Paul Hancock, Ivan S. Bojičić, Catherine Braiding, Miroslav Filipovic, Yasuo Fukui, Ashley J. Ruiter, Frank Haberl, X. Cui, Natasha Hurley-Walker, Graeme F Wong, Hidetoshi Sano, Michael G. Burton, Fiona H. Panther, Ivo R. Seitenzahl, Gerd Pühlhofer |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Spectral index 010504 meteorology & atmospheric sciences Infrared Astrophysics::High Energy Astrophysical Phenomena Hadron FOS: Physical sciences Astronomy and Astrophysics Cosmic ray Murchison Widefield Array Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Radio telescope Interstellar medium Space and Planetary Science 0103 physical sciences High Energy Physics::Experiment Supernova remnant Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences |
| Popis: | We examine the new Galactic supernova remnant (SNR) candidate, G23.11+0.18, as seen by the Murchison Widefield Array (MWA) radio telescope. We describe the morphology of the candidate and find a spectral index of -0.63+/-0.05 in the 70-170MHz domain. A coincident TeV gamma-ray detection in High-Energy Stereoscopic System (HESS) data supports the SNR nature of G23.11+0.18 and suggests that G23.11+0.18 is accelerating particles beyond TeV energies, thus making this object a promising new cosmic ray hadron source candidate. The remnant cannot be seen in current optical, infrared and X-ray data-sets. We do find, however, a dip in CO-traced molecular gas at a line-of-sight velocity of ~85 km/s, suggesting the existence of a G23.11+0.18 progenitor wind-blown bubble. Furthermore, the discovery of molecular gas clumps at a neighbouring velocity towards HESS J1832-085 adheres to the notion that a hadronic gamma-ray production mechanism is plausible towards the north of the remnant. Based on these morphological arguments, we propose an interstellar medium association for G23.11+0.18 at a kinematic distance of 4.6+/-0.8 kpc. 22 pages, 12 figures, Accepted for publication in The Astrophysical Journal |
| Databáze: | OpenAIRE |
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