2017/07/13 by Jian Li, Diego F. Torres, D. F. Torres +10 · 25 citations
Chemistry · Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Chemistry #Fermi Gamma-ray Space Telescope #Flux (metallurgy) #Gamma ray #Physics #Pulsars and Gravitational Waves Research #Range (aeronautics) #Telescope #astro-ph.HE
paper · pdf · doi:10.3847/1538-4357/aa7ff7
published in The Astrophysical Journal 846(2), 169 (IOP Publishing) · 17 pages, 4 figures, 1 table; Accepted for publication in ApJ
arxiv created 2017/07/13 · openalex publication_date 2017/09/10 · arxiv updated 2017/09/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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.