文章基本信息

标题：Additional Calibration of the Ultraviolet Imaging Telescope on Board AstroSat
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作者：S.N.Tandon ; J.Postma ; P.Joseph 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：159
期号：4
页码：2139-2149
DOI：10.3847/1538-3881/ab72a3
语种：English
出版社：American Institute of Physics
摘要：Results of the initial calibration of the Ultra-Violet Imaging Telescope (UVIT) were reported earlier by Tandon et al.The results reported earlier were based on the ground calibration as well as the first observations in orbit.Some additional data from the ground calibration and data from more in-orbit observations have been used to improve the results.In particular, extensive new data from in-orbit observations have been used to obtain (a) new photometric calibration that includes (i) zero points, (ii) flat fields, and (iii) saturation; (b) sensitivity variations; (c) spectral calibration for the near ultraviolet (NUV; 2000–3000 Å) and far ultraviolet (FUV; 1300–1800 Å) gratings; (d) point-spread function; and (e) astrometric calibration including distortion.Data acquired over the last three years show continued good performance of UVIT with no reduction in sensitivity in both UV channels.
关键词：Ultraviolet astronomy;Ultraviolet telescopes;Astronomical instrumentation;Ultraviolet photometry;Spectroscopy