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 (VHE) 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.

arXiv comment17 pages, 4 figures, 1 table; Accepted for publication in ApJ

References in corpus (72)

• The Milky Way in Molecular Clouds: A New Complete CO Survey
• The Second Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
• Studies in Astronomical Time Series Analysis. VI. Bayesian Block Representations
• The Fermi Large Area Telescope On Orbit: Event Classification, Instrument Response Functions, and Calibration
• Development of the Model of Galactic Interstellar Emission for Standard Point-Source Analysis of Fermi Large Area Telescope Data
• An Algorithm for Optimal Partitioning of Data on an Interval
• Variable Very High Energy Gamma-ray Emission from the Microquasar LS I +61 303
• Discovery of the Binary Pulsar PSR B1259-63 in Very-High-Energy Gamma Rays around Periastron with H.E.S.S
• Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT
• Discovery of very high energy gamma-rays associated with an X-ray binary
• 2FHL: The Second Catalog of Hard Fermi-LAT Sources
• Gamma-ray binaries: pulsars in disguise ?
• 3.9 day orbital modulation in the TeV gamma-ray flux and spectrum from the X-ray binary LS 5039
• Precise Gamma-Ray Timing and Radio Observations of 17 Fermi Gamma-Ray Pulsars
• Very High Energy Gamma-ray Radiation from the Stellar-mass Black Hole Cygnus X-1
• Direct observation of a sharp transition to coherence in Dense Cores
• Discovery of extreme particle acceleration in the microquasar Cygnus X-3
• Discovery of High-Energy Gamma-Ray Emission from the Binary System PSR B1259-63/LS 2883 Around Periastron with Fermi
• Understanding the Very High-Energy Emission from Microquasars
• Fermi LAT Observations of LS I +61 303: First detection of an orbital modulation in GeV Gamma Rays
• Fermi LAT Observations of LS 5039
• The H-test probability distribution revisited: Improved sensitivity
• Discovery of a point-like very-high-energy gamma-ray source in Monoceros
• HESS J0632+057 : A new gamma-ray binary?
• A High Sensitivity Measurement of the MeV Gamma-Ray Spectrum of Cygnus X-1
• {\it NuSTAR} Reveals an Intrinsically X-ray Weak Broad Absorption Line Quasar in the Ultraluminous Infrared Galaxy Markarian 231
• Periodic Emission from the Gamma-ray Binary 1FGL J1018.6-5856
• The Relation Between Cool Cluster Cores and Herschel-Detected Star Formation in Brightest Cluster Galaxies
• A giant radio flare from Cygnus X-3 with associated Gamma-ray emission
• Long-term monitoring of the high-energy gamma-ray emission from LS I +61° 303 and LS 5039
• A magnetar-like event from LS I +61 303 and its nature as a gamma-ray binary
• A New TeV Binary: The Discovery of an Orbital Period in HESS J0632+057
• Episodic Transient Gamma-Ray Emission from the Microquasar Cygnus X-1
• On the binary nature of the gamma-ray sources AGL J2241+4454 (=MWC 656) and HESS J0632+057 (=MWC 148)
• A Luminous Gamma-ray Binary in the Large Magellanic Cloud
• Chandra Observations of the Gamma-ray Binary LSI+61303: Extended X-ray Structure?
• Long-term TeV and X-ray Observations of the Gamma-ray Binary HESS J0632+057
• Gamma-ray flare activity from PSR B1259-63 during 2014 periastron passage and comparison to its 2010 passage
• Evidence for long-term Gamma-ray and X-ray variability from the unidentified TeV source HESS J0632+057
• Pulsar wind zone processes in LS 5039
• Associating long-term gamma-ray variability with the superorbital period of LS I 61 303
• The Evolution of Primordial Binary Open Star Clusters: Mergers, Shredded Secondaries and Separated Twins
• Inclination Mixing in the Classical Kuiper Belt
• Revealing the extended radio emission from the gamma-ray binary HESS J0632+057
• HD 259440: The Proposed Optical Counterpart of the gamma-ray Binary HESS J0632+057
• The radio counterpart of the likely TeV binary HESS J0632+057
• Discovery of variable VHE gamma-ray emission from the binary system 1FGL J1018.6-5856
• Unveiling the super-orbital modulation of LS I +61 303 in X-rays
• Superorbital modulation of X-ray emission from gamma-ray binary LSI +61 303
• Deep Chandra observations of TeV binaries I: LSI +61 303
• NGC 5548: Lack of a Broad Fe K Line and Constraints on the Location of the Hard X-ray Source
• gamma-ray emission from LS I +61 303: The impact of basic system uncertainties
• Deep Chandra observations of TeV binaries II: LS 5039
• Possible changes of state and relevant timescales for a neutron star in LS I +61°303
• Super-orbital variability of LS I +61°303 at TeV energies
• LS 5039 - the counterpart of the unidentified MeV source GRO J1823-12
• Long-term X-ray monitoring of LS I +61 303: analysis of spectral variability and flares
• Probing the Nature of the unidentified TeV Gamma-ray source HESS J0632+057 with Swift
• Variability in the orbital profiles of the X-ray emission of the gamma-ray binary LS I +61 303
• Detection of VHE γ-rays from HESS J0632+057 during the 2011 February X-ray outburst with the MAGIC Telescopes
• Long-term monitoring of LS I+61303 with INTEGRAL
• Optical spectroscopy of Be/gamma-ray binaries
• A model for the two component gamma-ray spectra observed from the gamma-ray binaries
• The TeV binary HESS J0632+057 in the low and high X-ray state
• The missing GeV γ-ray binary: Searching for HESS J0632+057 with Fermi-LAT
• Spectral analysis in orbital/superorbital phase space and hints of superorbital variability in the hard X-rays of LS I +61 303
• AXPs and SGRs in the outer gap model: confronting Fermi observations
• Gamma-rays from nebulae around binary systems containing energetic rotation powered pulsars
• Very high energy Fermi/LAT detection of HESS J0632+057
• Fermi Large Area Telescope Observations of the Monoceros Loop Supernova Remnant
• INTEGRAL observations of the gamma-ray binary 1FGL J1018.6-5856
• The Multi-wavelength Characteristics of the TeV Binary LS I +61${}^{\circ }$ 303

Cited by in corpus (21)

• Fermi Large Area Telescope Fourth Source Catalog
• Discovery of the Galactic High-Mass Gamma-ray Binary 4FGL J1405.1-6119
• Gamma-ray heartbeat powered by the microquasar SS 433
• Overview of non-transient gamma-ray binaries and prospects for the Cherenkov Telescope Array
• Observation of the gamma-ray binary HESS J0632+057 with the H.E.S.S., MAGIC, and VERITAS telescopes
• A hydrodynamics-informed, radiation model for HESS J0632$+$057 from radio to gamma rays
• Observing and modeling the gamma-ray emission from pulsar/pulsar wind nebula complex PSR J0205+6449/3C 58
• Orbital solution leading to an acceptable interpretation for the enigmatic gamma-ray binary HESS J0632+057
• An update on Fermi-LAT transients in the Galactic plane, including strong activity of Cygnus X-3 in mid-2020
• The GeV emission of PSR B1259-63 during its last three periastron passages observed by Fermi-LAT
• X-ray and gamma-ray orbital variability from the gamma-ray binary HESS J1832-093
• Long-term evolution of non-thermal emission from Type Ia and core-collapse supernova remnants in a diversified circumstellar medium
• Probing the Properties of the Pulsar Wind in the Gamma-Ray Binary HESS J0632+057 with NuSTAR and VERITAS Observations
• A multi-wavelength study of the gamma-ray binary candidate HESS J1832-093
• Multi-Wavelength Observation Campaign of the TeV Gamma-Ray Binary HESS J0632+057 with NuSTAR, VERITAS, MDM, and Swift
• Investigation of the broadband emission of the gamma-ray binary HESS J0632+057 using an intrabinary shock model
• Radius, rotational period and inclination of the Be stars in the Be/gamma-ray binaries MWC 148 and MWC 656
• Possible TeV $\gamma$-ray binary origin of HESS J1828-099
• Polarization study of gamma-ray binary
• GeV emission of gamma-ray binary with pulsar scenario
• The likely Fermi detection of the Be X-ray binary GRO J1008-57: hint for gamma-ray production in neutron-star X-ray binaries