Results 111 to 120 of about 15,217 (172)
, 2008 We review VLBI observations of supernovae over the last quarter century and discuss the prospect of imaging future supernovae with space VLBI in the context of VSOP-2. From thousands of discovered supernovae, most of them at cosmological distances, ~50 have been detected at radio wavelengths, most of them in relatively nearby galaxies. All of the radio
openaire +2 more sources
Lunar Observations and Geodetic VLBI – A Simulation Study [Elektronisk resurs]
, 2017 The recent OCEL (Observing the Chang’E Lander with VLBI) sessions allow the geodetic VLBI community to gain new experience concerning observations of an artificial lunar radio source.
Klopotek, Grzegorz, +2 more
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GSFC VLBI Analysis Center [PDF]
, 2013 This report presents the activities of the GSFC VLBI Analysis Center during 2012. The GSFC VLBI Analysis Center analyzes all IVS sessions, makes regular IVS submissions of data and analysis products, and performs research and software development aimed ...
Ma, Chopo +6 more
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Software Design for Kunming VLBI Station
, 2007 经过大量研究与论证，利用VLBI测量技术完成我国绕月卫星的精密测角（测轨）是完全可行的。为达到预定目标，上海天文台负责对昆明VLBI观测站进行软硬件改造，连同上海、北京、乌鲁木齐站，组成我国自有的VLBI网，共同完成对绕月卫星的测轨、定位及数据接收任务。 S3数据采集系统是昆明VLBI观测站的重要组成部分，对其终端系统的自动化控制是正确、迅速地监控、记录、实时传送相关数据的保证，进而确保整个昆明站能顺利完成VLBI测轨分系统安排的任务。2005年之前，在DOS操作系统环境下编写的非标准软件控制终端 ...
王涛
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On the Integration of VLBI Observations to GENESIS into Global VGOS Operations
Remote SensingThe upcoming European Space Agency (ESA) satellite mission GENESIS is an Earth-orbiting satellite carrying instruments of all four space geodetic techniques.
David Schunck +2 more
doaj +1 more source
Monitoring of multi-frequency polarization of gamma-ray bright AGNs
EPJ Web of Conferences, 2013 We started two observing programs with the Korean VLBI Network (KVN) monitoring changes in the flux density and polarization of relativistic jets in gamma-ray bright AGNs simultaneously at 22, 43, 86, 129 GHz.
Lee Sang-Sung +7 more
doaj +1 more source
Prospects of Detecting a Jet in Sagittarius A* with Very-long-baseline Interferometry
The Astrophysical JournalEvent Horizon Telescope (EHT) images of the horizon-scale emission around the Galactic center supermassive black hole Sagittarius A* (Sgr A*) favor accretion flow models with a jet component. However, this jet has not been conclusively detected.
Erandi Chavez +5 more
doaj +1 more source
Combining VLBI and GPS for inter-continental frequency transfer [Elektronisk resurs]
, 2015 For decades the Global Positioning System (GPS) has been the only space geodetic technique routinely used for inter-continental frequency transfer applications. In the past VLB) has also been considered for this purpose and the method's capabilities were
Haas, Rüdiger, +3 more
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Automated Modeling with AAP-Imfit: Astrometry and Photometry via CASA
The Astrophysical JournalVery long baseline interferometry (VLBI) provides the highest-resolution radio intensity maps, crucial for detailed studies of compact sources like active galactic nuclei (AGNs) and their relativistic jets.
Alfredo Amador-Portes +5 more
doaj +1 more source
Astronomy & AstrophysicsContext. Our previous work identified a class of SDSS quasars with multiple Gaia detections, classifying them as candidates for various astrophysical systems, such as quasar–star pairs, dual quasars, and gravitationally lensed quasars.
Zhang Y. +7 more
doaj +1 more source