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Title: GeV Detection of HESS J0632+057

Abstract

HESS J0632+057 is the only gamma-ray binary that has been detected at TeV energies, but not at GeV energies yet. Based on nearly nine years of Fermi Large Area Telescope (LAT) Pass 8 data, we report here on a deep search for the gamma-ray emission from HESS J0632+057 in the 0.1–300 GeV energy range. We find a previously unknown gamma-ray source, Fermi J0632.6+0548, spatially coincident with HESS J0632+057. The measured flux of Fermi J0632.6+0548 is consistent with the previous flux upper limit on HESS J0632+057 and shows variability that can be related to the HESS J0632+057 orbital phase. We propose that Fermi J0632.6+0548 is the GeV counterpart of HESS J0632+057. Considering the Very High Energy spectrum of HESS J0632+057, a possible spectral turnover above 10 GeV may exist in Fermi J0632.6+0548, as appears to be common in other established gamma-ray binaries.

Authors:
; ;  [1];  [2];  [3];  [4];  [5]
  1. Institute of Space Sciences (CSIC–IEEC), Campus UAB, Carrer de Magrans s/n, E-08193 Barcelona (Spain)
  2. Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong (China)
  3. European Space Astronomy Centre (ESA/ESAC), Science Operations Department, Villanueva de la Cañada (Madrid) (Spain)
  4. Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216 (China)
  5. School of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China)
Publication Date:
OSTI Identifier:
22679849
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 846; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMIC GAMMA SOURCES; DETECTION; EMISSION; ENERGY SPECTRA; GAMMA RADIATION; GEV RANGE; STARS; TELESCOPES; TEV RANGE; X RADIATION

Citation Formats

Li, Jian, Torres, Diego F., Wilhelmi, Emma de Oña, Cheng, K. -S., Kretschmar, Peter, Hou, Xian, and Takata, Jumpei. GeV Detection of HESS J0632+057. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA7FF7.
Li, Jian, Torres, Diego F., Wilhelmi, Emma de Oña, Cheng, K. -S., Kretschmar, Peter, Hou, Xian, & Takata, Jumpei. GeV Detection of HESS J0632+057. United States. doi:10.3847/1538-4357/AA7FF7.
Li, Jian, Torres, Diego F., Wilhelmi, Emma de Oña, Cheng, K. -S., Kretschmar, Peter, Hou, Xian, and Takata, Jumpei. Sun . "GeV Detection of HESS J0632+057". United States. doi:10.3847/1538-4357/AA7FF7.
@article{osti_22679849,
title = {GeV Detection of HESS J0632+057},
author = {Li, Jian and Torres, Diego F. and Wilhelmi, Emma de Oña and Cheng, K. -S. and Kretschmar, Peter and Hou, Xian and Takata, Jumpei},
abstractNote = {HESS J0632+057 is the only gamma-ray binary that has been detected at TeV energies, but not at GeV energies yet. Based on nearly nine years of Fermi Large Area Telescope (LAT) Pass 8 data, we report here on a deep search for the gamma-ray emission from HESS J0632+057 in the 0.1–300 GeV energy range. We find a previously unknown gamma-ray source, Fermi J0632.6+0548, spatially coincident with HESS J0632+057. The measured flux of Fermi J0632.6+0548 is consistent with the previous flux upper limit on HESS J0632+057 and shows variability that can be related to the HESS J0632+057 orbital phase. We propose that Fermi J0632.6+0548 is the GeV counterpart of HESS J0632+057. Considering the Very High Energy spectrum of HESS J0632+057, a possible spectral turnover above 10 GeV may exist in Fermi J0632.6+0548, as appears to be common in other established gamma-ray binaries.},
doi = {10.3847/1538-4357/AA7FF7},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 846,
place = {United States},
year = {2017},
month = {9}
}