English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

New data and results on the optical behaviour of the blazar PKS 0735+178 arepresented. In addition the whole historical light curve, and a new photometriccalibration of comparison stars are reported. Optical spectral indexes arecalculated and studied on years scales, while several methods for time-seriesanalysis are applied to the whole historical series and to each observingseason of our data set. This allowed to search and identify optical variabilitymodes, characteristic timescales and the signal power spectrum over 3 decadesin time. In the last 10 years the optical flux of PKS 0735+178 exhibited arather achromatic long-term behaviour and a variability mode resembling theshot-noise. The brightness level was in an intermediate/low state with a mildflaring activity and a superimposition/succession of rapid and slower flares,with no extraordinary/isolated outbursts but, at any rate, characterized by 1major active phase in 2001. Several mid-term scales (days, weeks) were found,the more common falling into values of about 27-28 days, 50-56 days and 76-79days. The rapid variability in the historical curve appear to be modulated by ageneral, slower and rather oscillating trend, where typical timescales of about4.5, 8.5 and 11-13 years can be identified. This spectral and temporalanalysis, accompanying our data publication, suggests the occurrence ofdistinctive variability signatures at days/weeks scales, that can likely be oftransitory nature. On the other hand the possible pseudo-cyclical ormulti-component modulations at long times could be more stable, recurrent andcorrelated to the bimodal radio flux behaviour and the twisted radio structureobserved by many years in this blazar

Ten-year optical monitoring of PKS 0735+178: historical comparison, multiband behavior, and variability timescales