SUMMARY OF PROPOSAL 63034
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THE VARIABLE ABSORBER IN THE HIGH-Z QUASAR S5 0836+710
ABSTRACTShort term variation of the absorbing column density in the highly redshifted quasar S5 0836+710 (z = 2.172) was previously observed. An increase by a factor 4 within 0.8 years (quasar frame) was reported and sets stringent constraints on the location of the absorber. This is the first finding of relatively high AND variable absorption in a quasar at high redshift and strengthens the hypotheses of a population of absorbed AGN at high redshift which is postulated to explain the X-ray background. To confirm the presence of high and variable absorption and to investigate the time scale of the variation four observations of the quasar S5 0836+710 with ASCA for a total of 80 ksec are proposed.
|CO-I NAME ||INSTITUTE ||COUNTRY |
|TARGET NAME||PRI||RA||DEC||TIME||TC||OFF||GIS||SIS CNT||OBS|
|1)S5 0836+710|| 3||130.3517|| 70.8951|| 80 ks||N||Y||P||0.30000||4|
TARGET 1THE OBSERVATION IS NOT MARKED TO BE A MONITORING PROGRAM SINCE THE SPACING OF THE FOUR OBSERVATIONS COULD BE ARRANGED TO FIT THE ASCA SCHEDULE.