A5069402046- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Photocathodes and Microchannel Plates
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Astronomy and Astrophysical Research
- Photorefractive and Nonlinear Optics
- Phase-change materials and chalcogenides
- Astronomical Observations and Instrumentation
- Glass properties and applications
- Gamma-ray bursts and supernovae
- Atmospheric Ozone and Climate
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Quantum optics and atomic interactions
- CCD and CMOS Imaging Sensors
- Spectroscopy and Laser Applications
- Spacecraft Design and Technology
- Astro and Planetary Science
- Inertial Sensor and Navigation
- Solid-state spectroscopy and crystallography
- Mineralogy and Gemology Studies
- Quantum Information and Cryptography
Indian Institute of Astrophysics
2008-2024
Government of Kerala
2018-2024
Remote Sensing Application Center
2022
Sensors (United States)
2019
National Centre for Radio Astrophysics
2016
Indian Space Research Organisation
2016
Tata Institute of Fundamental Research
2016
National Research Council Canada
2016
Indian Institute of Science Education and Research Kolkata
2016
Indian Institute of Science Bangalore
1980-2013
Abstract The Ultra-Violet Imaging Telescope (UVIT) is one of the payloads in ASTROSAT, first Indian Space Observatory. UVIT instrument has two 375 mm telescopes: for far-ultraviolet (FUV) channel (1300–1800 Å), and other near-ultraviolet (NUV) (2000–3000 Å) visible (VIS) (3200–5500 Å). primarily designed simultaneous imaging ultraviolet channels with spatial resolution better than 1.″8, along provisions slit-less spectroscopy NUV FUV channels. results in-orbit calibrations are presented this paper.
ASTROSAT is India's first astronomy satellite that will carry an array of instruments capable simultaneous observations in a broad range wavelengths: from the visible, near ultraviolet (NUV), far-UV (FUV), soft X-rays to hard X-rays. There be five principal scientific payloads aboard satellite: (i) Soft X-ray Telescope (SXT), (ii) three Large Area Xenon Proportional Counters (LAXPCs), (iii) Cadmium-Zinc-Telluride Imager (CZTI), (iv) two Ultra-Violet Imaging Telescopes (UVITs) one for visible...
Results of the initial calibration Ultra-Violet Imaging Telescope (UVIT) were reported earlier by Tandon et al. (2017). The results based on ground as well first observations in orbit. Some additional data from and more in-orbit have been used to improve results. In particular, extensive new obtain (a) photometric which includes (i) zero-points (ii) flat fields (iii) saturation, (b) sensitivity variations (c) spectral for near Ultra Violet (NUV; 2000 - 3000 Angstroms) far (FUV; 1300 1800...
Jellyfish are cluster galaxies that experience strong ram-pressure effects strip their gas. Their Hα images reveal ionized gas tails up to 100 kpc, which could be hosting ongoing star formation. Here, we report the ultraviolet (UV) imaging observation of jellyfish galaxy JO201 obtained at a spatial resolution ∼1.3 kpc. The intense burst formation happening in tentacles is focus this study. 'UV-brightest galaxy' Abell 85 (z ∼ 0.056) with knots and streams UV. We identify star-forming both...
ABSTRACT We present early results from the Ultra-Violet Imaging Telescope (UVIT) on board ASTROSAT observatory. report discovery of a hot companion associated with one blue straggler stars (BSSs) in old open cluster, NGC 188. Using fluxes measured four filters UVIT’s far-UV (FUV) channel, and two near-UV (NUV) we have constructed spectral energy distribution (SED) star WOCS-5885, after combining flux measurements GALEX , Ultraviolet Telescope, Optical SPITZER WISE several ground-based...
We present the in-orbit performance and first results from ultra-violet Imaging telescope (UVIT) on ASTROSAT. UVIT consists of two identical 38cm coaligned telescopes, one for FUV channel (130-180nm) other NUV (200-300nm) VIS (320-550nm) channels, with a field view 28 $arcmin$. The detectors are operated in high gain photon counting mode whereas detector is low integration mode. channels have filters gratings, has filters. ASTROSAT was launched 28th September 2015. verification carried out...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass transitions in arsenic-selenium glassesK. J. Rao and R. MohanCite this: Phys. Chem. 1980, 84, 15, 1917–1919Publication Date (Print):July 1, 1980Publication History Published online1 May 2002Published inissue 1 July 1980https://pubs.acs.org/doi/10.1021/j100452a010https://doi.org/10.1021/j100452a010research-articleACS PublicationsRequest reuse permissionsArticle Views165Altmetric-Citations28LEARN ABOUT THESE METRICSArticle Views are the...
Abstract We present the UV photometry of globular cluster NGC 1851 using images acquired with Ultraviolet Imaging Telescope (UVIT) onboard ASTROSAT satellite. Point-spread function fitting photometric data derived from in two far-UV (FUV) filters and one near-UV (NUV) filter are used to construct color–magnitude diagrams (CMDs), combination HST ground-based optical photometry. In FUV, we detect only bluest part horizontal branch (HB); NUV, full extent HB, including red blue a small number RR...
In ultraviolet (UV) astronomical observations, photons from the sources are very few compared to visible or infrared (IR) wavelength ranges. Detectors operating in UV usually employ a photon-counting mode of operation. These detectors have an image intensifier sensitive and readout mechanism that employs photon counting. The development readouts for these is resource-intensive expensive. this paper, we describe low-cost detector processing unit Raspberry Pi with its built perform Our system...
We have developed a lightweight low-cost attitude sensor, based on Raspberry Pi, built with readily available commercial components. It can be used in experiments where weight and power are constrained, such as high- altitude balloon flights. This sensor will major building block closed-loop control system driver motors to stabilize point cameras telescopes for astronomical observations from balloon-borne payload.
Some post-merger galaxies are known to undergo a starburst phase that quickly depletes the gas reservoir and turns it into red-sequence galaxy, though details still unclear. Here we explore pattern of recent star formation in central region galaxy NGC7252 using high resolution UV images from UVIT on ASTROSAT. The with 1.2 1.4 arcsec FUV NUV used construct FUV-NUV colour map region. pixel for this canonical reveals blue circumnuclear ring diameter $\sim$ 10 " (3.2 kpc) bluer patches located...
Context. The tidal tails of post-merger galaxies exhibit ongoing star formation far from their disks. study such systems can be useful for our understanding gas condensation in diverse environments. Aims. the directly studied ultraviolet (UV) imaging observations. Methods. post merger galaxy NGC7252 (“Atoms-for-Peace” galaxy) is observed with Astrosat UV telescope (UVIT) broadband NUV and FUV filters to isolate star-forming regions spatial variation rates. Results. Based on observations, we...
Context. NGC 40 is a planetary nebula with diffuse X-ray emission, suggesting an interaction of the high speed wind from WC8 central star (CS) nebula. It shows strong Civ 1550 Å emission that cannot be explained by thermal processes alone. We present here first map this in C IV using broad band filters on UVIT. Aims. To hot emitting gas and its correspondence soft (0.3-8 keV) regions, order to study shock ISM. This also illustrates potential UVIT for nebular studies. Methods. Morphological...
The high excitation planetary nebula, NGC 6302, has been imaged in two far-ultraviolet (FUV) filters, F169M (Sapphire; {\lambda}$_{\rm eff}$: 1608 {\AA}) and F172M (Silica; 1717 NUV N219M (B15; 2196 N279N (N2; 2792 with the Ultra Violet Imaging Telescope (UVIT). FUV image shows faint emission lobes that extend to about 5 arcmin on either side of central source. Faint orthogonal collimated jet-like structures are present through These not filters nor filter. Optical IR images 6302 show bright...
Optimum-designed footwear with polyurethane (PU) material for comfort is an important requirement obese. Investigations on compressive behavior of varied designed using 120 D PU have been carried out. The energy absorption primarily depends heel height, slope angle and load applied or body mass index Statistical analysis has used to formulate the prediction absorbed wherein a height 30 mm 20-degree provides optimum value incorporation material. A coefficientof- determination (R2) 0.9406...