SUMMARY OF SEQUENCE NUMBER 900012
SUMMARY OF SEQUENCE NUMBER 900012
Title: AXAF OBSERVATION OF FAINT HARD X-RAY SOURCES DISCOVERED WITH ASCA
Observer: TAKAHASHI
Subject Category: Diffuse Emission and Surveys
Seq: 900012 ObsId: 00940
Long-term Plan bin: no LTS bin
ABSTRACT
The origin of the Cosmic X-ray background (CXB) has been one of the key issues of X-ray astronomy. We propose AXAF observations of 15 selected hard X-ray sources discovered by the serendipitous source survey project with ASCA. These sources have 2-10 keV fluxes below 5 x 10^(-13) erg/cm2/s. ASCA 0.7-2/2-10 keV counting rates that require them to either have power law photon indecies flatter than 1.0, or if they have intrinsic slopes of 1.7, have column density greater than Nh = 2 x 10^22/cm^2. For the determination of the nature of the 2-10 keV source population excellent X-ray positions are absolutely vital to obtain reliable identifications, in particular if one does not know a priori the nature of the optical objects.
TARGET SUMMARY
| TARGET NAME |
RA | DEC |
TIME |
SI |
GRAT |
TYPE |
TC |
ROLL |
PRE |
PHASE |
MULTI |
PRI |
| AX J1951+5609 |
297.753070 | 56.160480 |
6.000000 |
ACIS-I |
NONE |
GO |
no |
no |
no |
no |
no |
5 |
IMAGES
(NOTE: RASS images currently only available for targets LTS scheduled on or after Apr-09-2000)
PARAMETERS
Obscat Parameters
