X-Ray Observation of Very High Energy Gamma-Ray Source, HESS J1745-303, with Suzaku

Abstract

Suzaku observations of a TeV unidentified (unID) source, HESS J1745-303, are presented. A possible excess of neutral iron line emission is discovered, and is likely associated with the main part of HESS J1745-303, named "region A". It may be an X-ray reflection nebula where the X-rays from previous Galactic Center (GC) activity are reflected by a molecular cloud. This result further strengthens the assumption that the molecular cloud which is spatially coincident with region A of HESS J1745-303 is located in the GC region. The TeV emission from molecular clouds is reminiscent of the diffuse TeV gamma-rays from the GC giant molecular clouds, and it could have the same emission mechanism. With deep exposure mapping observations by Suzaku, a tight upper-limit on the 2-10 keV continuum diffuse emission from region A is obtained, as 2.1x10^-13ergs s^-1cm^-2. The flux ratio between 1-10 TeV and 2-10 keV is larger than 4. Possible scenarios to reproduce wide-band spectra from keV to TeV are examined. Thermal X-rays from nearby two old supernova remnants, G359.0-0.9 and G359.1-0.5, are detected, and their emission properties are well determined in the present study with deep exposure.

18 pages, 14 figures, ApJ accepted

References in corpus (9)

• Reproducibility of Non-X-ray Background for the X-ray Imaging Spectrometer aboard Suzaku
• Exploring a SNR/Molecular Cloud Association Within HESS J1745-303
• Performance of the Charge Injection Capability of Suzaku XIS
• VLA and XMM-Newton observations of the SNR W41/TeV Gamma-ray source HESS J1834-087
• Suzaku Spectroscopy of an X-Ray Reflection Nebula and a New Supernova Remnant Candidate in the Sgr B1 Region
• Gamma-ray spectrum of RX J1713.7-3946 in the Fermi era and future detection of neutrinos
• Suzaku Detection of Extended/Diffuse Hard X-Ray Emission from the Galactic Center
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Cited by in corpus (22)

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• The XMM-Newton view of the central degrees of the Milky Way
• The gas-to-extinction ratio and the gas distribution in the Galaxy
• X-ray emission from HESS J1731-347/SNR G353.6-0.7 and Central Compact Source XMMS J173203-344518
• Diffuse X-Ray Sky in the Galactic Center
• GW150914-like Black Holes as Galactic High-Energy Sources
• Gamma rays from the Galactic Centre region: a review
• Suzaku Observations of the Non-thermal Supernova Remnant HESS J1731-347
• The Metal-enriched Thermal Composite Supernova Remnant Kesteven 41 (G337.8-0.1) in a Molecular Environment
• Suzaku Observation of the Diffuse X-Ray Emission from the Open Cluster Westerlund 2: a Hypernova Remnant?
• Exploring the dark accelerator HESS J1745-303 with Fermi Large Area Telescope
• X-ray Spectroscopy of the Mixed Morphology Supernova Remnant W28 with XMM-Newton
• Uniform distribution of the extremely overionized plasma associated with the supernova remnant G359.1-0.5
• Molecular and Atomic Gas toward HESS J1745-303 in the Galactic Center: Further Support for the Hadronic Scenario
• Observing two dark accelerators around the Galactic Centre with Fermi Large Area Telescope
• Fe K and ejecta emission in SNR G15.9+0.2 with XMM-Newton
• Suzaku observation of the unidentified VHE gamma-ray source HESS J1702-420
• No X-Ray Excess from the HESS J1741-302 Region except a New Intermediate Polar Candidate
• Spatial and Temporal Variations of the Diffuse Iron 6.4 keV Line in the Galactic Center Region
• High Energy Emission from the Galactic Center