SUMMARY OF PROPOSAL 62137
COLUMBIA UNIVERSITY
550 WEST 120TH STREET
NEW YORK
NY USA 10027
Tel: (212) 854-2554 Fax: (212) 854-8121
Medium: 2GB8MM
Subject: AGN
DEEP SEARCH FOR AN ENIGMATIC EGRET SOURCE
ABSTRACT
The brightest EGRET source at high Galactic latitude that remains unidentified is 2EG J1835+5919. Its uncertainty in position is only 9 arc minutes, yet there are no blazar or pulsar candidates in its error circle, and no X-ray source was detected in a ROSAT HRI observation. The absence of any plausible counterpart already makes it likely that 2EG J1835+5919 is the prototype of a new class of variable high-energy gamma-ray source, possibly the long-sought radio quiet or "proton blazar". One reason that ROSAT may have failed to detect an X-ray counterpart is if the source is highly absorbed. Another is if its X-rays are intrinsically hard or variable. A deep ASCA pointing may identify such a source, and reveal the nature of a new class of gamma-ray emitters.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| GREG MADEJSKI | NASA/GSFC | USA |
| BRENDA DINGUS | U. UTAH | USA |
| MATTHEW MALKAN | UCLA | USA |
| MICHAEL ERACLEOUS | UC BERKELEY | USA |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)2EG J1835+5919 | 2 | 278.7879 | 59.3222 | 80 ks | N | N | P | 0.01000 | 1 |
TARGET 1
SET LOWER-LEVEL DISCRIMINATOR IN 4-CCD MODE TO WHATEVER LEVEL IS NECESSARY TO AVOID TELEMETRY SATURATION.