Results 71 to 80 of about 2,377,761 (195)
Discerning Misclassified Flat-spectrum Radio Quasars from Low-frequency-peaked BL Lacertae Objects
The Astrophysical Journal Supplement SeriesA sample of 312 low-frequency-peaked BL Lacertae objects (LBLs) and 694 flat-spectrum radio quasars (FSRQs) with the parameters of both redshift and gamma-ray photon spectral index (Γ _γ ) is compiled from the Fourth Catalog of Active Galactic Nuclei ...
S. Liang +3 more
doaj +1 more source
Unraveling the Variation Mechanism of CTA 102: A Combined Spectral and Polarization Investigation
The Astrophysical JournalThe variation mechanism of blazars has been a longstanding question. As a target exhibiting extreme variability, CTA 102 offers a unique window into this puzzle.
Chen-Li Ma, Jun-Hao Deng, Yun-Guo Jiang
doaj +1 more source
Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.ABSTRACT The discovery of radio‐quiet, x‐ray thermally emitting isolated neutron stars (XINSs) in the ROSAT All‐Sky Survey revealed a previously overlooked component of the neutron star population. Advancements in x‐ray instrumentation and the availability of deep, wide‐area optical surveys now enable us to explore XINSs at fainter x‐ray fluxes and ...
Adriana Mancini Pires +11 more
wiley +1 more source
First results from high redshift quasar searches in VIKING [PDF]
, 2012 This thesis presents the discovery of the first luminous z & 6.5 quasars in the VISTA kilo-degree Infrared Galaxy Survey (VIKING). After some basic quality control, quasar selection is investigated via use of initial data supplementedwith ...
Findlay, Joseph
core +4 more sources
The Astrophysical JournalBlazars are active galactic nuclei known for their extreme variability, offering unique opportunities to study jet physics and high-energy emission mechanisms.
TianFang Zhang +21 more
doaj +1 more source
Neural interfaces: Bridging the brain to the world beyond healthcare
Exploration, Volume 4, Issue 5, October 2024.This perspective explores diverse neural interfaces in the brain, offering transformative possibilities for engaging with our environment and enhancing communication. Emphasis is placed on the role of both non‐invasive and invasive neural interfaces in transforming practical applications beyond the realm of healthcare, emphasizing the promising ...
Shumao Xu +3 more
wiley +1 more source
B2 1308+326: A Changing-look Blazar or Not?
The Astrophysical JournalIn our previous study, we identified a shift in the synchrotron peak frequency of the blazar B2 1308+326 from 10 ^12.9 to 10 ^14.8 Hz during a flare, suggesting it could be a changing-look blazar (CLB).
Ashwani Pandey +8 more
doaj +1 more source
The Oscillation in Evolution of Changing-look Blazar OQ 334
The Astrophysical JournalWe investigate the evolution of a changing-look blazar (CLB) on long timescales and expect to trace the state change of a CLB. Three morphological types, including a flat spectrum radio quasar (FSRQ) state, transition state, and BL Lacertae (BL Lac ...
S. S. Ren +3 more
doaj +1 more source
Spectrophotometry of 2 complete samples of flat radio spectrum quasars [PDF]
, 1983 Spectrophotometry of two complete samples of flat-spectrum radio quasars show that for these objects there is a strong correlation between the equivalent width of the CIV wavelength 1550 emission line and the luminosity of the underlying continuum ...
Baldwin, J. A. +3 more
core
Jet collimation and acceleration in the flat spectrum radio quasar 1928+738
Astronomy & AstrophysicsUsing time-resolved multifrequency Very Long Baseline Array data and new KaVA (KVN and VERA Array) observations, we study the structure and kinematics of the jet of the flat spectrum radio quasar (FSRQ) 1928+738. We find two distinct jet geometries as a function of distance from the central black hole, with the inner jet having a parabolic shape ...
Kunwoo Yi +4 more
openaire +2 more sources