18 citations · 48 across the 13 of their papers we have counts for
12 papers · 1 filter
Testing X-ray Periodicity and Long-Term Trend in PG 1553+113 via Targeted Swift-XRT Monitoring
P. Peñil, N. Torres-Albà, L. Marcotulli +5
PG~1553+113 is the blazar with the most-significantly detected periodic patter in its multiwavelength (MWL) emission, making it one of the most promising candidates for hosting a s…
Distortions in Periodicity Analysis of Blazars II: The Impact of Gaps
P. Peñil, N. Torres-Albà, A. Rico +4
Time series analysis is fundamental to characterizing the variability inherent in multi-wavelength emissions from blazars. However, a major observational challenge lies in the need…
Extensive Analysis of gamma-Ray Periodicity in Jetted AGN from the 4FGL Catalog Using Fermi-LAT Observations
P. Peñil, A. Domínguez, S. Buson +3
The quest to uncover periodic patterns within the -ray emissions of jetted active galactic nuclei (AGN) has recently emerged as a focal point in astrophysics. One of the primary…
Transient QPOs of Fermi-LAT blazars under the Curved Jet Model
P. Penil, J. Otero-Santos, A. Banerjee +4
This study explores transient quasi-periodic oscillations (QPOs) in the -ray emission of two blazars, PMN J05314827 and PKS 1502+106, using over a decade of Fermi Large Area…
Transient QPOs of Fermi-LAT blazars with Linearly Multiplicative Oscillations
P. Penil, J. Otero-Santos, A. Circiello +5
We present a study on the detection and characterization of transient quasi-periodic oscillations (QPOs) in the -ray emission of blazars 4C +31.03, MG1 J123931+0443, and PKS 162…
Search for Kink Events in Variable Fermi-LAT Blazars
P. Peñil, H. Zhang, J. Otero-Santos +10
This study explores the detection of Quasi-Periodic Oscillations (QPOs) in blazars as a method to identify kink events within their jets, utilizing both -ray and polarized light…
Distortions in Periodicity Analysis of Blazars: The Impact of Flares
Pablo Peñil, Nuria Torres-Albà, Alba Rico +3
Blazars, a unique class of active galactic nuclei, exhibit highly variable emission across the electromagnetic spectrum. This variability frequently manifests as intense flaring ev…
Systematic Search for Long-Term Trends in Fermi-LAT Jetted Active Galactic Nuclei
P. Penil, A. Domínguez, S. Buson +3
Jetted Active Galactic Nuclei (AGN) exhibit variability across a wide range of time scales. Traditionally, this variability can often be modeled well as a stochastic process. Howev…
Singular Spectrum Analysis of Fermi-LAT Blazar Light Curves: A Systematic Search for Periodicity and Trends in the Time Domain
Alba Rico, A. Domínguez, P. Peñil +4
A majority of blazars exhibit variable emission across the entire electromagnetic spectrum, observed over various time scales. In particular, discernible periodic patterns are dete…
Decade-long periodicity study of 2FHL blazars with historical optical data
Sagar Adhikari, Pablo Peñil, Alberto Domínguez +3
In our recent investigation, we utilized a century's worth of archival optical data to search for a decade-long periodicity from the blazar PG 1553+113, finding a hint of a 22-yr p…
Constraining the PG 1553+113 binary hypothesis: interpreting hints of a new, 22-year period
Sagar Adhikari, Pablo Penil, John Ryan Westernacher-Schneider +5
PG 1553+113 is a well-known blazar exhibiting evidence of a -yr quasi-periodic oscillation (QPO) in radio, optical, X-ray, and -ray bands. Since QPO mechanisms often…
Search for Periodic Variability in -ray Blazars Using \textit{Fermi}-LAT
P. Peñil, M. Ajello, S. Buson +5
Blazars are known to exhibit variability across a broad range of timescales. This behavior can include periodicity in their -ray emission, whose clear detection remains an ongoi…