Strong X-ray absorption in the quasar RXJ1028.6-0844 at redshift 4.28

Details Strong X-ray absorption in the quasar RXJ1028.6-0844 at redshift 4.28 Strong X-ray absorption in the quasar RXJ1028.6-0844 at redshift 4.28

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.0205y&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #02.05; Bulletin of the American Astronomical Society, Vol. 32, p.1183

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the evidence for a strong low-energy spectral cutoff in the radio-loud quasar RXJ1028.6-0844 at a redshift of 4.28 obtained with an ASCA observation. The most likely explanation is photoelectric absorption of the soft X-rays. Our result confirmed that the excess X-ray absorption is common for radio-loud quasars at redshifts extending up to z>4. If the absorber lies close to the quasar, the derived H column density ( ~ 2x 1023} cm{-2) is the largest among those found in high-redshift radio quasars. This may indicate the presence of a remarkably large amount of obscuring matter in the quasar environment in the early universe. Possible origins of the absorber are discussed.

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