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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

To determine the location of the intra-day variable (IDV) emission regionwithin the jet of the BL Lac object S5 0716+714, a multi-epoch VSOPpolarization experiment was performed in Autumn 2000. To detect, image, andmonitor the short term variability of the source, three space-VLBI experimentswere performed with VSOP at 5 GHz, separated in time by six days and by oneday. Quasi-contemporaneous flux density measurements with the Effelsberg 100 mradio telescope during the VSOP observations revealed variability of about 5%in total intensity and up to 40% in linear polarization in less than one day.Analysis of the VLBI data shows that the variations are located inside the VLBIcore component of 0716+714. In good agreement with the single-dishmeasurements, the VLBI ground array images and the VSOP images, both show adecrease in the total flux density of ~20 mJy and a drop of ~5 mJy in thelinear polarization of the VLBI core. During the observing interval, thepolarization angle rotated by about 15 degrees. No variability was found in thejet. The high angular-resolution VSOP images are not able to resolve thevariable component and set an upper limit of <0.1 mas to the size of the corecomponent. From the variability timescales we estimate a source size of a fewmicro-arcseconds and brightness temperatures exceeding 10^15 K. We discuss theresults in the framework of source-extrinsic (interstellar scintillationinduced) and source-intrinsic IDV models.Comment: 15 pages, 10 figures, A&A in press, minor language editing to match  the final versio

Space-VLBI polarimetry of the BL Lacertae object S5 0716+714: rapid polarization variability in the VLBI core