ASCA Observation of the Lyman-limit Quasar PKS2145+067

Details ASCA Observation of the Lyman-limit Quasar PKS2145+067 ASCA Observation of the Lyman-limit Quasar PKS2145+067

2000-06-16

arxiv.org/abs/astro-ph/0006224v1

Astronomy and Astrophysics

Astrophysics

15 pages, 3figures, Latex(PASJadd,sty, PASJ95.sty) accepted in PASJ

Scientific paper

X-ray observation of a famous Lyman-limit quasar PKS2145+067at z_em= 0.990 was carried with ASCA. The source showed a 2-10 keV flux of 1.3 E-11 erg cm^-2 sec^-1 (L_X = 2.5 E46 erg sec^-1 for H_0=50 km s^-1 Mpc^-1) described by a power-law spectrum with a photon index Gamma=1.63 +/- 0.04 . In the ASCA energy band, no excess absorption was detected implying the absorption column density at z_ ab=0.791 was less than 1.6 E21 cm^-2 if absorbing medium had a metal abundance of 0.5 solar. Comparison with previous Einstein and ROSAT observations shows that PKS2145+067 has increased its luminosity by a factor of 2--3 between 1991 and 1998.

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