• 제목/요약/키워드: radio

검색결과 9,490건 처리시간 0.034초

VSOP: SPACE VLBI PROJECT

  • MAKOTO INOUE
    • 천문학회지
    • /
    • 제29권spc1호
    • /
    • pp.419-420
    • /
    • 1996
  • The VLBI Space Observatory Program (VSOP) is a worldwide project of one radio telescope in space with many ground radio telescopes. The concerted space VLBI network enables us to reveal high resolution and high quality images of radio sources. The space radio telescope is anticipated to be launched in January/February 1997, and collaborative observations have been coordinated. The basic parameters of the system and present status are given.

  • PDF

POLARIZATION OBSERVATIONS OF RADIO SOURCES IN THE FIELD CONTAINING ABELL 695

  • Kim, Kwang-Tae
    • 천문학회지
    • /
    • 제21권2호
    • /
    • pp.117-132
    • /
    • 1988
  • Multi-frequency polarization observations of Abell 695 are reported here. The brightest radio source 0838+325, which was previously classified as a wide angled head-tail radio source, is, in the present observations, resolved into two separable sources, a head-tail source 0838+325 AB and a diffuse one 0838+325C. The radio-tail shows high degree of linear polarization(${\sim}50$-25%) along the radio-tail, suggesting that the interaction with its surrounding intracluster medium (ICM) is not highly turbulent. With the present data, thermal particle densities at the locations of these sources are estimated to be n > $10^{-5}\;cm^{-3}$.

  • PDF

HVDC 컨버터 시스템에서 라디오 장해에 대한 대책 (Reduction Method of Radio Interference in HVDC Converter System)

  • 김찬기;최순호
    • 전기학회논문지
    • /
    • 제61권6호
    • /
    • pp.833-837
    • /
    • 2012
  • In HVDC System, the rapid voltage breakdown between anodes and cathodes during valve firing causes radio interference in HVDC converter station. These voltage breakdown causes steep current pulse and inject current in system. As a result, harmonic frequencies are generated from valve, switchyard. In this paper, theoretical background of radio interference in HVDC converter is discussed and its reduction method for radio interference is proposed.

Morphology of radio relics in galaxy clusters

  • Fernandez, Paola Dominguez
    • 천문학회보
    • /
    • 제46권1호
    • /
    • pp.36.1-36.1
    • /
    • 2021
  • Galaxy clusters host Mpc-scale diffuse radio emission giving us evidence of large-scale magnetic fields in the Universe. It is relevant to understand magnetic field amplification processes occurring at the center and outskirts of galaxy clusters. Each of these processes are believed to give rise to observed radio haloes and radio relics, respectively. In this work, we focus on studying the continuum and polarised emission in radio relics. We use threedimensional magnetohydrodynamical simulations of merger shock waves propagating through a magnetized, turbulent intracluster medium. Our model includes the diffusive shock acceleration (DSA) of cosmic ray electrons, their spatial advection and energy losses at run-time. We discuss the relation between the mock observation features and the underlying morphology of the magnetic field.

  • PDF