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

We have observed the BL Lac object 1ES2344+514 (z = 0.044) in Very HighEnergy (VHE) gamma-ray and near-infrared wavelength bands with TACTIC and MIROtelescopes respectively. The observations were made from 18th October to 9thDecember 2004 and 27th October 2005 to 1st January 2006. Detailed analysis ofthe TACTIC data indicates absence of a statistically significant gamma-raysignal both in overall data and on a nightly basis from the source direction.We estimate an upper limit of I($\geq$1.5 TeV)$\leq 3.84 \times 10^{-12}$photons cm$^{-2}$ s$^{-1}$ at a 3$\sigma$ confidence level on the integrated$\gamma$-ray flux. In addition, we have also compared TACTIC TeV light curveswith those of the RXTE ASM (2-12keV) for the contemporary period and find thatthere are no statistically significant increases in the signal strengths fromthe source in both these energy regions. During 2004 IR observations,1ES2344+514 shows low level (~0.06 magnitude) day-to-day variation in both, J &H bands. However, during 2005 observation epoch, the source brightens up byabout 0.41 magnitude from its October 2005 level J magnitude= 12.64 to J =12.23 on December 6, 2005. It then fades by about 0.2 magnitude during 6 to 10December, 2005. The variation is seen in both, J & H, bands simultaneously. Thelight travel time arguments suggest that the emission region size is of theorder of $10^{17}$ cms.

Very High Energy $\gamma$-ray and Near Infrared observations of 1ES2344+514 during 2004-05