SUMMARY OF PROPOSAL 53027
MULLARD SPACE SCIENCE LABORATORY
SURREY UK RH5 6NT
HOLMBURY ST. MARY
Tel: +1483 204157 Fax: +1483 278312
INVESTIGATING THE STEEP, SOFT POWER-LAW IN THE X-RAY SPECTRUM OF THE EUV-SELECTED AGN, REJ2248-511.
ABSTRACTThe ROSAT PSPC spectrum of the EUV-selected AGN REJ2248-511 (z=0.10) shows an unusual degree of curvature; already soft between 0.3-2keV (with an energy index of 1.6), it steepens further at lower energies to form a `true' ultra-soft X-ray excess. This poses a problem for the nature of the alpha=1.6 power-law; is this the softening of the more typical alpha=1 hard X-ray continuum, or is it an extrapolation of an unusually soft X-ray power-law slope? We request ASCA observations to measure the index of the 1-10keV spectrum; the results will test the nature of the 0.1-2keV X-rays measured by ROSAT and challenge models of what has previously been considered to be the `canonical' X-ray power-law in AGN.
|TARGET NAME||PRI||RA||DEC||TIME||TC||OFF||GIS||SIS CNT||OBS|
|1)REJ2248-511|| 1||342.1708||-51.1650|| 20 ks||N||Y||P||0.39000||1|