Astrosat's Ultraviolet Imaging Telescope Success

Astronomical Milestone: 10 Years of the Ultraviolet Imaging Telescope (UVIT)

Background & Development:

• The Ultraviolet Imaging Telescope (UVIT) is a primary payload aboard Astrosat, India’s first dedicated space observatory.
• Launched by ISRO on September 28, 2015, it marks the culmination of significant technological advances in astronomical observations.

Operational Highlights:

• UVIT successfully completed 10 years of operation, celebrating its contributions to astronomy both in India and internationally.
• It observes a broad wavelength range: near-ultraviolet (NULV; 200-300 nm), visible (320-550 nm), and far-ultraviolet (FUV; 130-180 nm).
• Over the last decade, UVIT has observed a total of 1,451 celestial targets.

Scientific Contributions:

• Approximately 300 research articles and 19 PhD theses have been produced from data acquired via UVIT.
• Significant findings include:
  • Discovery of hot compact stars around B stars and blue straggler stars.
  • Stellar formation in the Andromeda galaxy.
  • Feedback effects from novae in active galactic nuclei.
  • Discovery of extended UV disks in dwarf galaxies and planetary nebulae.
  • Detection of emissions from distant galaxies at a redshift of 1.42.
  • Relationships between UV and X-ray emissions from active galactic nuclei.
  • Young star formation characteristics in galaxies.

Technical Specifications:

• UVIT features a large field of view and superior spatial resolution (better than 1.5 arcseconds), making it unique globally alongside the Hubble Space Telescope.
• A specialized laboratory, the MGK Menon Laboratory, was established for operating sensitive components to prevent contamination.

Collaborations & Leadership:

• The UVIT project involved collaborations with several institutes, including IUCAA (Pune), TIFR (Mumbai), and ISRO's various centers.
• IIA (Indian Institute of Astrophysics), the leading institution, played a pivotal role in design, assembly, testing, and delivery with continual operations managed at the Payload Operation Center (POC).

Future Prospects:

• Based on two decades of experience, plans to develop a next-generation space facility, the Indian National Spectroscopic and Imaging Space Telescope (INSIST), have been initiated.
• An academic workshop is scheduled for December 4, 2025, to discuss future UV telescope functionalities and missions.

Significance for International Astronomy:

• UVIT’s unique capabilities contribute significantly to global astronomical research, with Indian and international astronomers actively utilizing its data for various studies.

This milestone embodies India's growing capabilities in space science and technology, facilitated by the Department of Science and Technology (DST) and ISRO. It showcases India's commitment to advancing scientific knowledge and contributing to the global scientific community.