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

With the upgrade from GRAVITY to GRAVITY$^+$ the instrument will evolve intoan all-sky interferometer that can observe faint targets, such as high redshiftAGN. Observing the faintest targets requires reducing the noise sources inGRAVITY as much as possible. The dominant noise source, especially in the bluepart of the spectrum, is the backscattering of the metrology laser light ontothe detector. To reduce this noise we introduce two new metrology modes. With acombination of small hardware changes and software adaptations, we can dim themetrology laser during the observation without losing the phase referencing.For single beam targets, we can even turn off the metrology laser for themaximum SNR on the detector. These changes lead to an SNR improvement of over afactor of two averaged over the whole spectrum and up to a factor of eight inthe part of the spectrum currently dominated by laser noise.

GRAVITY faint: reducing noise sources in GRAVITY$^+$ with a fast metrology attenuation system