Nine years of multi-frequency monitoring of the blazar PKS 0048-097: spectral and temporal variability

Abstract

Blazars are highly variable, radio-loud active galactic nuclei with jets oriented at a small angle to the line of sight. The observed emission of these sources covers the whole electromagnetic spectrum from radio frequencies up to the high or even very high energy gamma-ray range. To understand the complex physics of these objects, multi-wavelength observations and studies on the variability and correlations between different wavelengths are therefore essential. The long-term multi-frequency observations of PKS 0048-097 are analysed here to investigate its spectral and temporal features. The studies includes nine years of observations of the blazar, which is well studied in the optical and radio domain, but not in the other frequencies. Multi-wavelength data collected with OVRO, KAIT, Catalina, Swift/UVOT, Swift/XRT and Fermi/LAT were studied. The performed analysis revealed strong variability in all wavelengths that is most clearly manifested in the X-ray range. The correlation studies do not exhibit any relation between different wavelengths, except for the very strong positive correlation between the optical emission in V and R bands.

11 pages, 7 figures, published in A&A

References in corpus (13)

• Fermi Large Area Telescope Bright Gamma-ray Source List
• Modeling the Emission Processes in Blazars
• X-ray spectral evolution of TeV BL Lac objects: eleven years of observations with BeppoSAX, XMM-Newton and SWIFT satellites
• Swift and infra-red observations of the blazar 3C~454.3 during the giant X-ray flare of May 2005
• Superorbital variability of X-ray and radio emission of Cyg X-1 - II. Dependence of the orbital modulation and spectral hardness on the superorbital phase
• A Large Sample of BL Lacs from SDSS and FIRST
• Longterm Optical Monitoring of Bright BL Lacertae Objects with ATOM: Spectral Variability and Multiwavelength Correlations
• Temporal Correlations Between Optical and Gamma-ray Activity in Blazars
• Flux upper limits for 47 AGN observed with H.E.S.S. in 2004-2011
• Discovery of very high energy gamma-ray emission from the BL Lac object PKS 0301-243 with H.E.S.S
• Long-term monitoring of PKS 2155$-$304 with ATOM and H.E.S.S.: investigation of optical/$\gamma$-ray correlations in different spectral states
• Swift XRT and UVOT deep observations of the high energy peaked BL Lac object PKS 0548-322 close to its brightest state
• Simultaneous multi-wavelength observations of the TeV Blazar Mrk 421 during February - March 2003: X-ray and NIR correlated variability

Cited by in corpus (4)

• Characterizing long-term optical, ultraviolet and X-ray variability in different activity states of OJ 287
• H.E.S.S. Monitoring of PKS 2155-304 in 2015 and 2016
• Constraining X-ray emission in HBL blazars using multiwavelength observations
• 20 years of monitoring: PKS 2155-304 and PKS 1510-089 in the eyes of Swift and Fermi. I. The case of PKS 2155-304