Search for the Identification of 3EG J1835+5918: Evidence for a New Type of High-Energy Gamma-ray Source

Details Search for the Identification of 3EG J1835+5918: Evidence for a New Type of High-Energy Gamma-ray Source Search for the Identification of 3EG J1835+5918: Evidence for a New Type of High-Energy Gamma-ray Source

2000-05-11

arxiv.org/abs/astro-ph/0005256v1

Astronomy and Astrophysics

Astrophysics

31 pages, 6 figures, Accepted for publication in ApJ, figures with finding charts excluded (version with finding charts is ava

Scientific paper

10.1086/309418

The EGRET source 3EG J1835+5918 is the brightest and most accurately positioned of the as-yet unidentified high-energy gamma-ray sources at high Galactic latitude (l,b=89,25). We present a multiwavelength study of the region around it, including X-ray, radio, and optical imaging surveys, as well as optical spectroscopic classification of most of the active objects in this area. The identified X-ray sources in or near the EGRET error ellipse are radio-quiet QSOs, a galaxy cluster, and coronal emitting stars. The radio sources inside the error ellipse are all fainter than 4 mJy at 1.4 GHz. In addition there are no flat-spectrum radio sources in the vicinity. Since no blazar-like or pulsar-like candidate has been found as a result of these searches, 3EG J1835+5918 must be lacking one or more of the physically essential attributes of these known classes of gamma-ray emitters. If it is an AGN it lacks the beamed radio emission of blazars by at least a factor of 100 relative to identified EGRET blazars. If it is an isolated neutron star, it lacks the steady thermal X-rays from a cooling surface and the magnetospheric non-thermal X-ray emission that is characteristic of all EGRET pulsars. If a pulsar, 3EG J1835+5918 must be either older or more distant than Geminga, and probably an even more efficient or beamed gamma-ray engine.

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