23 citations · 101 across the 9 of their papers we have counts for
8 papers
PKS 2155-304: Long-Term Optical Photometric Monitoring and Variability Analysis
J. L. Weiss, I. Andruchow, E. J. Marchesini +6
Through the detailed study of the optical flux behaviour in blazars over time, it is possible to infer the conditions responsible for their observed emission. PKS 2155-304, a BL La…
Optical monitoring in southern blazars. Analysis of variability and spectral colour behaviours
L. Zibecchi, I. Andruchow, E. Ej. Marchesini +2
We present the results of the optical monitoring of 18 southern blazars in the V and R Johnson-Cousins bands. Our main objective is to study the variations in the optical flux and…
Multi-band behaviour of the TeV blazar PG 1553+113 in optical range on diverse timescales
A. Agarwal, B. Mihov, I. Andruchow +11
Context. The TeV BL Lac object PG 1553+113 is one of the primary candidates for a binary supermassive black hole system. Aims. We study the flux and spectral variability of PG 1553…
Microvariability in AGNs: study of different statistical methods II. Light curves from simulated images
L. Zibecchi, I. Andruchow, S. A. Cellone +1
In a previous paper, we studied two statistical methods used to analyse the variability of active galactic nuclei (AGNs): the C and F statistics. Applying them to observed differen…
Indications for transit timing variations in the exo-Neptune HAT-P-26b
C. von Essen, S. Wedemeyer, M. S. Sosa +8
From its discovery, the low density transiting Neptune HAT-P-26b showed a 2.1-sigma detection drift in its spectroscopic data, while photometric data showed a weak curvature in the…
Multiwavelength monitoring of a very active dwarf nova AX J1549.85416 with an unusually high duty cycle
Guobao Zhang, Joseph D. Gelfand, David M. Russell +5
We present the results of our analysis of new optical, ultraviolet (UV) and X-ray observations of a highly variable source AX J1549.85416. Both the detection of several fast…
Microvariability in AGNs: study of different statistical methods - I. Observational analysis
L. Zibecchi, I. Andruchow, S. A. Cellone +3
We present the results of a study of different statistical methods currently used in the literature to analyse the (micro)variability of active galactic nuclei (AGNs) from ground-b…
Optical flux behaviour of a sample of Fermi blazars
E. J. Marchesini, I. Andruchow, S. A. Cellone +7
Aims: We aim at investigating the time-behaviour of a sample of gamma-ray blazars. We present the results from a 13 month-long optical photometry monitoring campaign of the blazars…