18 citations · 58 across the 15 of their papers we have counts for
15 papers
Profile Analysis of the Multiwavelength 2.1-year Oscillations of PG 1553+113
P. Peñil, N. Torres-Albà, A. Rico +5
We investigate the morphology of the oscillation profiles of the blazar PG~1553+113 in relation to its well-known 2.1 yr periodicity. We identify individual cycles in the …
Morphology-aware periodicity searches in Fermi-LAT blazars
Aaron A. Maldonado, Alberto Domínguez, Adithiya Dinesh +4
Standard periodicity searches in active galactic nuclei assume sinusoidal modulation, whereas gamma-ray blazar emission often features asymmetric flares and localized bursts. We in…
Gamma-Ray Periodicity in Jetted AGN: Revisiting Periodicity Candidates with >17 years of Fermi-LAT Data
P. Peñil, A. Rico, A. Domínguez +3
We reanalyze previously reported gamma-ray periodicity candidates in jetted active galactic nuclei using more than 17 years of Fermi-LAT observations. The updated data provide a ro…
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…
The Alma catalogue of OB stars. III. A cross-match with Gaia DR3 and an extension based on new spectral classifications
M. Pantaleoni González, J. Maíz Apellániz, R. H. Barbá +4
We present the third installment of the Alma Luminous Star (ALS) catalogue, aimed at creating the most comprehensive and clean sample of Galactic massive stars. This update extends…
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…