In-orbit Performance of UVIT and First Results
S. N. Tandon, J. B. Hutchings, S. K. Ghosh, A. Subramaniam, G. Koshy,, V. Girish V, P. U. Kamath, s. Kathiravan, A. Kumar, J. P. Lancelot, P. K., Mahesh, R. Mohan, J. Murthy, S. Nagabhushana, A. K. Pati A, J. Postma, N., Kameswara Rao, K. Sankarasubramanian, P. Sreekumar
TL;DR
This paper reports on the in-orbit performance of the UVIT telescope on ASTROSAT, showing it meets or exceeds expected sensitivity and resolution, and demonstrates the potential of high-resolution multi-band UV observations.
Contribution
It provides the first in-orbit performance assessment of UVIT, comparing it with ground calibrations and showcasing high-resolution UV imaging capabilities.
Findings
Sensitivity within ~15% of ground estimates
Spatial resolution exceeds design value in NUV
High-resolution images reveal detailed UV structures
Abstract
The performance of the ultraviolet telescope (UVIT) on-board ASTROSAT is reported. The performance in orbit is also compared with estimates made from the calibrations done on the ground. The sensitivity is found to be within ~15% of the estimates, and the spatial resolution in the NUV is found to exceed significantly the design value of 1.8 arcsec and it is marginally better in the FUV. Images obtained from UVIT are presented to illustrate the details revealed by the high spatial resolution. The potential of multi-band observations in the ultraviolet with high spatial resolution is illustrated by some results.
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