منابع مشابه
PKS 0241 + 011 : the largest quasar ?
We have made a radio and optical study of the radio source PKS 0241+011 associated with a quasar at z = 1.40. In earlier radio maps this source appears as a large triple radio source with an angular extent of 400 arcsec (2.4h −1 Mpc; H 0 = 100h km s −1 Mpc −1 , q 0 = 0.0). If the triple radio structure seen in radio maps represents a single object, PKS 0241+011 would be the largest radio quasar...
متن کاملA Rapid X-ray Flare in the Radio-loud Narrow Line Quasar Pks 0558-504
We report the detection of a very short time scale flare in the radio-loud narrow line quasars PKS 0558-504 by using ASCA. The X-ray count rates increased and decreased by a factor of two in 33 minutes, and possibly by 40% in as short as two minutes during this flare, confirming that such flare event does occur in this object with imaging detectors. The implied largest rate of change in luminos...
متن کاملSub - arcsecond imaging and spectroscopy of the radio - loud highly polarized quasar PKS 1610 – 771 ⋆
We report on imaging and spectroscopic observations of the radio-loud, highly polarized quasar PKS 1610–771 (z = 1.71). Our long-slit spectroscopy of the companion 4.55 NW of the quasar confirms the stellar nature of this object, so ruling out the previously suspected gravitationally lensed nature of this system. PKS 1610–771 looks fuzzy on our sub-arcsecondR and I images and appears located in...
متن کاملFermi /lat Discovery of Gamma-ray Emission from the Flat-spectrum Radio Quasar Pks 1454-354
We report the discovery by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope of high-energy γ−ray (GeV) emission from the flat-spectrum radio quasar PKS 1454-354 (z = 1.424). On 4 September 2008 the source rose to a peak flux of (3.5±0.7)×10 ph cm s (E > 100 MeV) on a time scale of hours and then slowly dropped over the following two days. No significant spectral change...
متن کاملLoud Quasar Lobe Dominated Radio Loud Quasar Radio Galaxy Broad
In this second paper, in a series of two, we determine the properties of the stellar torus that we showed in the first paper to result as a product of two merging black holes. If the surrounding stellar cluster is as massive as the binary black hole, the torque acting on the stars ejects a fraction which extracts the binary’s angular momentum. After the black holes coalesced on scales of ∼ 10 y...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1997
ISSN: 0004-637X
DOI: 10.1086/311001