Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-11
Astronomy and Astrophysics
Astrophysics
6 pages, 2 tables. To appear in Astrophysics & Space Science
Scientific paper
10.1007/s10509-005-7700-0
Statistical studies indicate that the 271 point sources of high-energy gamma rays belong to two groups: a Galactic population and an isotropic extragalactic population. Many unidentified extragalactic sources are certainly blazars, and it is the intention of this work to uncover gamma-ray blazars missed by previous attempts. Until recently, searches for blazar counterparts to unidentified EGRET sources have focused on finding AGN that have 5-GHz radio flux densities S_5 near or above 1 Jy. However, the recent blazar identification of 3EG J2006-2321 (S_5 = 260 mJy) and other work suggest that careful studies of weaker flat-spectrum sources may be fruitful. In this spirit, error circles of 4 high-latitude unidentified EGRET sources have been searched for 5-GHz sources. The gamma-ray sources are 3EG J1133+0033, 3EG J1212+2304, 3EG J1222+2315, and 3EG J1227+4302. Within the error contours of each of the four sources are found 6 radio candidates; by observing the positions of the radio sources with the 0.81-m Tenagra II telescope it is determined that 14 of these 24 radio sources have optical counterparts with R < 22. Eight of these from two different EGRET sources have been observed in the B, V, and R bands in more than one epoch and the analysis of these data is ongoing. Any sources that are found to be variable will be the objects of multi-epoch polarimetry studies.
Bloom Steven David
Lewis Susan M.
Wallace Paul M.
No associations
LandOfFree
A Multiwavelength Investigation of Unidentified EGRET Sources does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Multiwavelength Investigation of Unidentified EGRET Sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Multiwavelength Investigation of Unidentified EGRET Sources will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-201145