Results 11 to 20 of about 16,751 (259)
Multi-messenger emission characteristics of blazars [PDF]
Frontiers in Astronomy and Space SciencesMulti-messenger observations and theories of astrophysical objects are rapidly becoming a critical research area in the astrophysics scientific community. In particular, point-like objects such as BL Lacertae (BL Lac) objects, flat-spectrum radio quasars
Ronald Gamble +10 more
doaj +5 more sources
The RoboPol Program: Optical Polarimetric Monitoring of Blazars
Galaxies, 2019 After three years of polarimetric monitoring of blazars, the RoboPol project has uncovered several key characteristics of polarimetric rotations in the optical for these most variable sources.
Vasiliki Pavlidou, Dmitry Blinov
exaly +3 more sources
Fermi-LAT Stacking Analysis Technique: An Application to Extreme Blazars and Prospects for their CTA Detection [PDF]
Astrophysical Journal, 2019 We present a likelihood profile stacking technique based on the Fermi-Large Area Telescope (LAT) data to explore the γ-ray characteristics of Fermi-LAT undetected astrophysical populations.
V. Paliya +4 more
semanticscholar +3 more sources
General Physical Properties of Fermi Blazars [PDF]
The Astrophysical Journal Supplement Series, 2023 We study the general physical properties of Fermi blazars using the Fermi fourth source catalog data (4FGL-DR2). The quasi-simultaneous multiwavelength data of Fermi blazars are fitted by using the one-zone leptonic model to obtain some physical ...
Yongyun Chen +8 more
doaj +2 more sources
X-ray properties of z > 4 blazars [PDF]
Monthly notices of the Royal Astronomical Society, 2019 We present the X-ray analysis of the largest flux-limited complete sample of blazar candidates at z > 4 selected from the Cosmic Lens All Sky Survey (CLASS).
L. Ighina +8 more
semanticscholar +4 more sources
Long-Term Optical Monitoring of Blazars [PDF]
Galaxies, 2019 Systematic monitoring of specific targets in the optical regime was historically applied on a very narrow sample of known variable stars. The discovery of blazars in the 20th century brought to the foreground the need for new global sky surveys, covering
Kosmas Gazeas
doaj +2 more sources
Source Count Distribution of Fermi LAT Gamma-Ray Blazars Using Novel Nonparametric Methods
UniverseWe utilized a sample from the Fermi-LAT 14-year Source Catalog by adjusting the flux detection threshold, enabling us to derive the intrinsic source count distribution dN/dF25 of extragalactic blazars using nonparametric, unbinned methods developed by ...
Houdun Zeng
exaly +3 more sources
Journal of High Energy Astrophysics, 2015 I will review recent advances in the field of blazars, highlighting the contribution of Swift. Together with other operating satellites (most notably Fermi, but also AGILE, WISE, Planck) and ground based facilities such as Cherenkov telescopes, Swift was (and is) crucial for improving our understanding of blazars.
Ghisellini, Gabriele
openaire +4 more sources
Leptohadronic multi-messenger modeling of 324 gamma-ray blazars [PDF]
Astronomy & Astrophysics, 2023 The origin of the diffuse astrophysical neutrino flux observed by the IceCube experiment is still under debate. Multiple associations have been reported between high-energy neutrino events and individual blazars, such as the source TXS 0506+056, which ...
X. Rodrigues +5 more
semanticscholar +1 more source
Correlating High-energy IceCube Neutrinos with 5BZCAT Blazars and RFC Sources [PDF]
Astrophysical Journal Letters, 2023 We investigate the possibility that blazars in the Roma-BZCAT Multifrequency Catalogue of Blazars (5BZCAT) are sources of the high-energy astrophysical neutrinos detected by the IceCube Neutrino Observatory, as recently suggested by Buson et al. Although
C. Bellenghi +3 more
semanticscholar +1 more source