Multifrequency studies of the enigmatic gamma-ray source 3EG J1835+5918

Abstract

The EGRET telescope has repeatedly observed 3EG J1835+5918 as a bright and steady source of high-energy gamma-ray radiation which has not yet been indentified. EGRET data from CGRO observation cycle 1 to 7 have been reanalysed above 100 MeV and above 1 GeV. The gamma-ray source location represents the latest and probably final positional assessment based on EGRET data. We especially adress the question of flux variability and spectral variability. The results of a X-ray/optical identification campaign towards 3EG J1835+5918 are given. The one object which might be associated with the gamma-ray source 3EG J1835+5918 has the characteristics of an isolated neutron star and possible of a radio-quiet pulsar.

arXiv comment8 pages, 5 figures, accepted for publication in MNRAS

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• Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT
• Variability of EGRET Gamma-Ray Sources
• Thermal luminosities of cooling neutron stars
• The Gamma-Ray Blazar Content of the Northern Sky
• Pulsar Timing for the Fermi Gamma-ray Space Telescope
• Gamma-ray Pulsar Revolution
• Gamma ray astrophysics: the EGRET results
• Gamma Ray Pulsars: Multiwavelength Observations
• Is the EGRET source 3EG J1621+8203 the radio galaxy NGC 6251?
• The Next Geminga: Deep Multiwavelength Observations of a Neutron Star Identified with 3EG J1835+5918
• Fermi Large Area Telescope observations of PSR J1836+5925
• First gamma-rays from galaxy clusters. Preliminary evidence of the association of galaxy clusters with EGRET unidentified gamma-ray sources
• The Next Geminga: Search for Radio and X-ray Pulsations from the Neutron Star Identified with 3EG J1835+5918
• An AGN Identification for 3EG J2006-2321
• On the cross correlation between the arrival direction of ultra-high energy cosmic rays, BL Lacertae, and EGRET detections: A new way to identify EGRET sources?
• A multi-wavelength search for a counterpart of the unidentified gamma-ray source 3EG J2020+4017 (2CG078+2)
• Unraveling the Nature of Unidentified High Galactic Latitude Fermi/LAT Gamma-ray Sources with Suzaku
• XMM-Newton and ESO observations of the two unidentified gamma-ray sources 3EG J0616-3310 and 3EG J1249-8330
• The Dark Knight Falters
• Dense gas clouds and the Unidentified EGRET sources
• The Multiwavelength Approach to Unidentified Gamma-Ray Sources
• Pulsars and Their Nebulae as EGRET Sources
• Long-term AGILE monitoring of the puzzling gamma-ray source 3EG J1835+5918
• Multifrequency Strategies for the Identification of Gamma-Ray Sources
• Region of Excessive Flux of PeV Cosmic Rays in the Direction Toward Pulsars PSR J1840+5640 and LAT PSR J1836+5925
• A Deep Optical Observation for an Enigmatic Unidentified Gamma-Ray Source 3EG J1835+5918
• GLAST Large Area Telescope Multiwavelength Planning