Results 141 to 150 of about 81,623 (245)
Highly Variable Quasar Candidates Selected from 4XMM-DR13 with Machine Learning
The Astrophysical JournalWe present a sample of 12 quasar candidates with highly variable soft X-ray emission, selected from the fourth XMM-Newton Serendipitous Source Catalog (4XMM-DR13), using random forest (RF).
Heng Wang +8 more
doaj +1 more source
Quasar Red Shifts: Can They Be Due to Implosion? [PDF]
, 1966 Banesh Hoffmann
openalex +1 more source
UEG Week 2025 Moderated Posters
United European Gastroenterology Journal, Volume 13, Issue S8, Page S189-S802, October 2025.
wiley +1 more source
Symposium - International Astronomical Union, 1987 If quasars are distributed cosmologically according to their red-shifts, then it is expected that their distribution on the sky will be very close to random, because it is in that case an average over an enormous range in distance. Most studies find no significant clustering.
openaire +1 more source
UEG Week 2025 Poster Presentations
United European Gastroenterology Journal, Volume 13, Issue S8, Page S803-S1476, October 2025.
wiley +1 more source
The Astrophysical JournalWe report integral field spectroscopy observations with the Near-Infrared Spectrograph on board the James Webb Space Telescope, targeting the 60 kpc environment surrounding the most luminous obscured quasar known at z = 4.6.
Andrey Vayner +20 more
doaj +1 more source