منابع مشابه
X-ray and optical study of the giant radio quasar 4C+74.26
We present the optical and X-ray study of the radioloud quasar 4C +74.26. The ASCA spectrum is rather complex with indications of a reflection component, a neutral iron line and a warm absorber. The underlying power law has a photon index of Γ = 2.03± 0.09. The soft X-ray flux in 1996 is nearly twice as high as that found in a ROSAT observation in 1993 without apparent spectral changes. The X-r...
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15 صفحه اولX-ray observation of the super-luminal quasar 4C +73.18 (1928+738) by ASCA
The results of an X-ray observation of the nearby core-dominated, super-luminal quasar 4C +73.18 (1928+738) with ASCA are reported. Variations of the 1–10 keV flux on time-scales of the order of 10 hours were found while the 0.5– 1 keV flux remained almost unchanged. The measured flux at 1 keV had increased by ∼ 50% compared with previous observations 18 years ago. The quasar shows a curved spe...
متن کاملExploring the disc/jet interaction in the radio-loud quasar 4C +74.26 with Suzaku
We report on a 90 ks Suzaku observation of the radio-loud quasar 4C +74.26. The source was observed in its highest flux state to date, and we find that it brightened by about 20 per cent during the observation. We see evidence of spectral hardening as the count rate increases and also find that the rms variability increases with energy up to about 4 keV. We clearly detect a broadened Fe line bu...
متن کاملLong-term optical photometric monitoring of the quasar SDSS J153259.96−003944.1
We report optical Cousins R and I band monitoring observations of the high redshift (z = 4.67) QSO SDSS J153259.96−003944.1 that does not show detectable emission lines in its optical spectrum. We show this object varies with a maximum amplitude of ∼0.4 mag during a year and three months of monitoring. Combined with two other epochs of photometric data available in the literature, we show the o...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2003
ISSN: 0035-8711
DOI: 10.1046/j.1365-2966.2003.07102.x