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Discovery of recombining plasma inside the extended gamma-ray supernova remnant HB9
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Date
2019-11-01
Author
Sezer, A.
Ergin, Tülün
Yamazaki, R.
Sano, H.
Fukui, Y.
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We present the results from the Suzaku X-ray Imaging Spectrometer observation of the mixed-morphology supernova remnant (SNR) HB9 (G160.9+2.6). We discovered recombining plasma (RP) in the western Suzaku observation region and the spectra here are well described by a model having collisional ionization equilibrium (CIE) and RP components. On the other hand, the X-ray spectra from the eastern Suzaku observation region are best reproduced by the CIE and non-equilibrium ionization model. We discuss possible scenarios to explain the origin of the RP emission based on the observational properties and concluded that the rarefaction scenario is a possible explanation for the existence of RP. In addition, the gamma-ray emission morphology and spectrum within the energy range of 0.2-300 GeV are investigated using 10 yr of data from the Fermi Large Area Telescope (LAT). The gamma-ray morphology of HB9 is best described by the spatial template of radio continuum emission. The spectrum is well fit to a log-parabola function and its detection significance was found to be 25 sigma. Moreover, a new gamma-ray point source located just outside the south-east region of the SNR's shell was detected with a significance of 6 sigma. We also investigated the archival HI and CO data and detected an expanding shell structure in the velocity range of -10.5 and +1.8 km s(-1) that is coinciding with a region of gamma-ray enhancement at the southern rim of the HB9 shell.
Subject Keywords
: ISM: individual objects: (HB9: G160.9+2.6)
,
ISM: supernova remnants
,
X-rays: ISM
,
gamma-rays: ISM
,
ISM: atoms
,
ISM: molecules
URI
https://hdl.handle.net/11511/33003
Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
DOI
https://doi.org/10.1093/mnras/stz2461
Collections
Department of Physics, Article
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A. Sezer, T. Ergin, R. Yamazaki, H. Sano, and Y. Fukui, “Discovery of recombining plasma inside the extended gamma-ray supernova remnant HB9,”
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
, pp. 4300–4310, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/33003.