D. Israyelyan
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View article: Very-high-energy observations of the Seyfert galaxy NGC 4151 with MAGIC -- Indication of another gamma-ray obscured candidate neutrino source
Very-high-energy observations of the Seyfert galaxy NGC 4151 with MAGIC -- Indication of another gamma-ray obscured candidate neutrino source Open
Seyfert galaxies are emerging as a promising source class of high-energy neutrinos. The Seyfert galaxies NGC 4151 and NGC 1068 have come up respectively as the most promising counterparts of a 3$σ$ and of a 4.2$σ$ neutrino excesses detecte…
View article: Very high-energy gamma-ray detection and long-term multiwavelength view of the flaring blazar B2 1811+31
Very high-energy gamma-ray detection and long-term multiwavelength view of the flaring blazar B2 1811+31 Open
Context. Among the blazars whose emission has been detected up to very high-energy (VHE; 100 GeV< E <100 TeV) γ rays, intermediate synchrotron-peaked BL Lacs (IBLs) are quite rare. The IBL B2 1811+31 ( z = 0.117) exhibited intense flaring …
View article: Markarian Multiwavelength Data Center (MMDC): A Tool for Retrieving and Modeling Multitemporal, Multiwavelength, and Multimessenger Data from Blazar Observations
Markarian Multiwavelength Data Center (MMDC): A Tool for Retrieving and Modeling Multitemporal, Multiwavelength, and Multimessenger Data from Blazar Observations Open
The Markarian Multiwavelength Data Center ( MMDC ) is a web-based tool designed for accessing and retrieving multiwavelength and multimessenger data from blazar observations. MMDC facilitates the construction and interactive visualization …
View article: The Remarkable Predictive Power of Infrared Data of Blazars
The Remarkable Predictive Power of Infrared Data of Blazars Open
Blazars are the brightest and most abundant persistent sources in the extragalactic γ -ray sky. Due to their significance, they are often observed across various energy bands, where the data of which can be used to explore potential correl…
View article: Firmamento: A Multimessenger Astronomy Tool for Citizen and Professional Scientists
Firmamento: A Multimessenger Astronomy Tool for Citizen and Professional Scientists Open
Firmamento ( https://firmamento.hosting.nyu.edu ) is a new-concept, web-based, and mobile-friendly data analysis tool dedicated to multifrequency/multimessenger emitters, as exemplified by blazars. Although initially intended to support a …
View article: Broad-band study of gamma-ray blazars at redshifts <i>z</i> = 2.0–2.5
Broad-band study of gamma-ray blazars at redshifts <i>z</i> = 2.0–2.5 Open
High redshift blazars are among the most powerful non-explosive sources in the Universe and play a crucial role in understanding the evolution of relativistic jets. To understand these bright objects, we performed a detailed investigation …
View article: Broadband Study of Gamma-Ray Blazars at Redshifts $z=2.0-2.5$
Broadband Study of Gamma-Ray Blazars at Redshifts $z=2.0-2.5$ Open
High redshift blazars are among the most powerful non-explosive sources in the Universe and play a crucial role in understanding the evolution of relativistic jets. To understand these bright objects, we performed a detailed investigation …
View article: The remarkable predictive power of infrared data in Blazars
The remarkable predictive power of infrared data in Blazars Open
Blazars are the brightest and most abundant persistent sources in the extragalactic gamma-ray sky. Due to their significance, they are often observed across various energy bands to explore potential correlations between emissions at differ…
View article: Origin of multiwavelength emission from flaring high redshift blazar PKS 0537−286
Origin of multiwavelength emission from flaring high redshift blazar PKS 0537−286 Open
The high redhsift blazars powered by supermassive black holes with masses exceeding 109 M⊙ have the highest jet power and luminosity and are important probes to test the physics of relativistic jets at the early epochs of the Universe. We …
View article: Modelling the time variable spectral energy distribution of the blazar CTA 102 from 2008 to 2022
Modelling the time variable spectral energy distribution of the blazar CTA 102 from 2008 to 2022 Open
We present long-term multiwavelength observations of blazar CTA 102 ($z$ = 1.037). Detailed temporal and spectral analyses of γ-ray, X-ray, and UV/optical data observed by Fermi-LAT, Swift XRT, NuSTAR, and Swift-UVOT over a period of 14 yr…
View article: Multiwavelength Monitoring Of Blazars Pks 2155-304 And S5 0716+71
Multiwavelength Monitoring Of Blazars Pks 2155-304 And S5 0716+71 Open
The study of multiwavelength emission properties of blazar jets has the potential to shed light on the particle acceleration and emission mechanisms taking place in them. The emission of PKS 2155-304 (z = 0.116) and S5 0716+71 (z = 0.31) b…
View article: X-ray spectra, light curves and SEDs of blazars frequently observed by Swift
X-ray spectra, light curves and SEDs of blazars frequently observed by Swift Open
Blazars research is one of the hot topics of contemporary extragalactic astrophysics. That is because these sources are the most abundant type of extragalactic γ-ray sources and are suspected to play a central role in multimessenger astrop…
View article: Multiwavelength study of high-redshift blazars
Multiwavelength study of high-redshift blazars Open
High-redshift blazars are among the most powerful objects in the Universe. The spectral and temporal properties of 33 distant blazars (z > 2.5) detected in the high-energy γ-ray band are investigated by analysing the Fermi-LAT and Swift…