Results 1 to 10 of about 855,208 (176)
Astronomy & AstrophysicsAims. We study differences in the physical properties of quasar host galaxies using an optically selected sample of radio-loud (RL) and radio-quiet quasars (in the redshift range 0.15 ≤ z ≤ 1.9) that we have further cross-matched with the VLA-FIRST ...
Chakraborty Avinanda +6 more
doaj +1 more source
Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers
Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto +9 more
wiley +1 more source
The Astrophysical Journal Supplement SeriesWe present multifrequency and high-resolution studies of a sample of 24 radio transient sources discovered by comparing the NRAO VLA Sky Survey and the Very Large Array Sky Survey.
Magdalena Kunert-Bajraszewska +8 more
doaj +1 more source
Cosmic Supernova Neutrino and Gamma-Ray Backgrounds in the MeV Regime
The Astrophysical Journal, 2023 Cosmic multimessenger backgrounds include relic diffuse components created in the early universe and contributions from individual sources. Here, we study both type Ia supernovae (SNe Ia) and core-collapse supernovae (CCSNe) contributions to the diffuse ...
Samalka Anandagoda +6 more
doaj +1 more source
Medical Physics, Volume 51, Issue 4, Page 2354-2366, April 2024.Abstract Background Cardiac radioablation is a noninvasive stereotactic body radiation therapy (SBRT) technique to treat patients with refractory ventricular tachycardia (VT) by delivering a single high‐dose fraction to the VT isthmus. Cardiorespiratory motion induces position uncertainties resulting in decreased dose conformality.
Osman Akdag +6 more
wiley +1 more source
Probing the Low-radio-frequency Emission in PG Quasars with the uGMRT. II
The Astrophysical Journal Supplement SeriesWe present results from uGMRT 685 MHz observations of 87 QSOs belonging to the Palomar–Green (PG) quasar sample with z
Sanna Gulati +5 more
doaj +1 more source
Revealing the Physical Driver of the Baldwin Effect: Gas Density in the Broad-line Region
The Astrophysical JournalThe Baldwin effect—the inverse correlation between the equivalent width of emission lines and the continuum luminosity in active galactic nuclei (AGNs)—has been known for nearly five decades, yet its physical origin remains poorly understood.
Wen-Qiang Liang +10 more
doaj +1 more source
The Jet-Disk Coupling of Seyfert Galaxies from a Complete Hard X-ray Sample
Universe, 2020 We analyze the jet-disk coupling for different subsamples from a complete hard X-ray Seyfert sample to study the coupling indices and their relation to accretion rate.
Xiang Liu +3 more
doaj +1 more source
Discovery of spectacular quasar-driven superbubbles in red quasars. [PDF]
Sci Adv, 2023 Shen L +9 more
europepmc +1 more source
FROM GALACTIC TO EXTRAGALACTIC JETS: A REVIEW
Acta Polytechnica, 2013 An analysis of the data that have recently become available from observing campaigns, including VLA, VLBA, and satellite instruments, shows some remarkable similarities and significant differences in the data from some epochs of galactic microquasars ...
James H. Beall
doaj +1 more source