We examine the gravitational lensing eeect of a foreground galaxy cluster on the number count statistics of background X-ray sources. The lensing produces a deecit in the number of resolved sources in a ring close to the critical radius of the cluster. This deecit could be detected at the 3 level with the AXAF-ACIS camera.

We report on Chandra ACIS observations of the ultracompact AM CVn binary ES Cet. This object has a 10.3 minute binary period and is the most compact of the confirmed AM CVn systems. We have, for the first time, unambiguously detected the X-ray counterpart to ES Cet. In a 20 ksec ACIS-S image a point-like X-ray source is found within 1 " of the catalogued optical position. The mean countrate in ...

Penglibatan dan daya tarikan bidang keusahawanan semakin meningkat ekoran daripada kemajuan teknologi yang turut memberi kesan positif kepada dunia perniagaan melalui platform digital seperti Alibaba, Shopee, Lazada sebagainya. Budaya pembelian secara atas talian popular dalam kalangan pengguna, menjadikan fokus para peniaga mula teralih menjalankan digital. Bagi mengimbangi kehendak semasa keu...

Within the solar system, X-ray emissions have been detected from every planet except Ice Giants: Uranus and Neptune. We analyze three archival Chandra observations of (each 24–30 ks duration) to date: a stand-alone Advanced CCD Imaging Spectrometer (ACIS) observation on August 7, 2002 two High Resolution Camera (HRC) November 11 12, 2017 coordinated with optical observations. For earlier ACIS o...

Complex agriculture projects directly affect the welfare of over half world’s population, are a key Sustainable Development Goal (SDG), and account for single most extensive human activity across 40% surface. Furthermore, they highly susceptible to environmental, social, economic pressures such as climate change, cyclical pandemics, market disruptions, diminishing arable land. These issues also...

Abstract We show the ACIS trap maps developed for the CTI correction algorithm can be applied to the GRADED mode data. The technique uses the fltgrade information available in the GRADED mode telemetry, and average 3 × 3 PHAS images for each fltgrade pre-calibrated using the FAINT mode data. The results (recovery of photon energies and energy resolution) are nearly identical to those from the C...