Results 121 to 130 of about 771 (176)
Broad band energy distribution of ROSAT detected quasars. Pt. 2 Radio-quiet objects
, 1997 A database of radio-quiet quasers detected with ROSAT is presented containing 846 quasars seen in the All-Sky Survey and/or in pointed PSPC observations. About #propor to#70% of the objects have been detected in X-rays for the first time.
Siebert, J. +4 more
core
UEG Week 2024 Moderated Posters
United European Gastroenterology Journal, Volume 12, Issue S8, Page 201-664, October 2024.
wiley +1 more source
Radio imaging of gravitationally lensed radio-quiet quasars
Monthly Notices of the Royal Astronomical SocietyABSTRACT We present 6 GHz Very Large Array radio images of 70 gravitational lens systems at 300 mas resolution, in which the source is an optically selected quasar, and nearly all of which have two lensed images. We find that about in half of the systems (40/70, with 33/70 secure), one or more lensed images are detected down to our ...
Neal Jackson +5 more
openaire +5 more sources
Evidence for Higher Black Hole Spin in Radio-loud Quasars
, 2017 One of the major unsolved questions concerning the understanding of the active galactic nucleus population is the origin of the dichotomy between radio-quiet and radio-loud quasars.
Lu, Youjun +9 more
core +1 more source
UEG Week 2024 Oral Presentations
United European Gastroenterology Journal, Volume 12, Issue S8, Page 9-200, October 2024.
wiley +1 more source
The prevalence of FRI radio quasars
, 2007 We present deep, multi-VLA-configuration radio images for a set of 18 quasars, having redshifts between 0.36 and 2.5, from the 7C quasar survey. Approximately one quarter of these quasars have FRI-type twin-jet structures and the remainder are a broad ...
Blundell, Katherine +7 more
core +1 more source
The Astrophysical JournalWe perform milliarcsecond X-ray astrometry of the quadruply lensed radio-quiet quasar GraL J065904.1+162909 (J0659). This z _s = 3.083 quasar is lensed into four images and was discovered with the second Data Release of the Gaia Space Observatory (Gaia ...
Júlia M. Sisk-Reynés +4 more
doaj +1 more source
The Astrophysical JournalWe present new Chandra/ACIS-S imaging spectroscopy of two luminous type 2 quasars (QSO2s), FIRST J120041.4+314745 ( z = 0.116) and 2MASX J13003807+5454367 ( z = 0.088), and compare their X-ray emission with Hubble Space Telescope [O III ] λ 5007 ...
Anna Trindade Falcão +19 more
doaj +1 more source
X-Ray Emission Properties of a Compact Symmetric Object Sample
The Astrophysical JournalWe present a comprehensive analysis of the X-ray observations obtained from XMM-Newton and Chandra for a sample of bona-fide Compact Symmetric Objects (CSOs) to investigate their X-ray emission properties.
Ying-Ying Gan +4 more
doaj +1 more source
The Astrophysical JournalWe report the fastest quasar outflow first detected in the ultraviolet, via variable C iv and Si iv absorption at outflow velocities −77,000 km s ^−1 to at least −90,000 km s ^−1 , in the radio-quiet quasar SDSS J231854.31+243954.2 (J2318).
Lucas M. Seaton +22 more
doaj +1 more source