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

We performed a detailed timing study of the Atoll source 4U 1705-44 in orderto understand the accretion disk geometry. Cross correlation function (CCF)studies were performed between soft (3-5 keV) and hard energy (15-30 keV) bandsusing the AstroSat LAXPC data. We detected hard as well as soft lags of theorder of few ten to hundred seconds. A dynamical CCF study was performed in thesame energy bands for one of the light curves and we found smaller lags of fewtens of seconds ($<$ 50 s) suggesting that the variation is probablyoriginating from the corona. We found a broad noise component around $\sim$ 13Hz in the 3-10 keV band which is absent in 10-20 keV band. We interpret theobserved lags as the readjustment timescales of the corona or a boundary layeraround the neutron star and constrain the height of this structure to few tensof km. We independently estimated the coronal height to be around 15 kmassuming that the 13 Hz feature in the PDS is originating from the oscillationof the viscous shell around the neutron star.

Investigating the coronal structure by studying time lags in the Atoll source 4U 1705-44 using AstroSat