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Browsing by Author "Joseph, P"

Browsing by Author "Joseph, P"

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  • In-orbit Calibrations of the Ultraviolet Imaging Telescope 
    Tandon, S. N; Subramaniam, A; Girish, V; Postma, J; Sankarasubramanian, K; Sriram, S; Stalin, C. S; Mondal, Chayan; Sahu, S; Joseph, P; Hutchings, J; Ghosh, S. K; Barve, Indrajit V; George, K; Kamath, P. U; Kathiravan, S; Kumar, A; Lancelot, J. P; Leahy, D; Mahesh, P. K; Mohan, Rekhesh; Nagabhushana, S; Pati, A. K; Kameswara Rao, N; Sreedhar, Yuvraj Harsha; Sreekumar, P (IOP Publishing, 2017-09)
    The Ultra-Violet Imaging Telescope (UVIT) is one of the payloads in ASTROSAT, the first Indian Space Observatory. The UVIT instrument has two 375 mm telescopes: one for the far-ultraviolet (FUV) channel (1300–1800 Å), ...
  • In-orbit performance of UVIT over the past 5 years 
    Ghosh, S. K; Joseph, P; Kumar, A; Postma, J; Stalin, C. S; Subramaniam, A; Tandon, S. N; Barve, Indrajit V; Devaraj, A; George, K; Girish, V; Hutchings, J. B; Kamath, P. U; Kathiravan, S; Lancelot, J. P; Leahy, D; Mahesh, P. K; Mohan, R; Nagabhushana, S; Pati, A. K; Kameswara Rao, N; Sankarasubramanian, K; Sreekumar, P; Sriram, S (Indian Academy of Sciences, 2021-10)
    Over the last 5 years, UVIT has completed observations of more than 500 proposals with ∼800 unique pointings. In addition, regular planned monitoring observations have been made and from their analysis various key parameters ...
  • Insights on bar quenching from a multiwavelength analysis: the case of messier 95 
    George, K; Joseph, P; Mondal, Chayan; Subramanian, S; Subramaniam, A; Paul, K. T (EDP Sciences, 2019-01)
    The physical processes related to the effect of bars in the quenching of star formation in the region between the nuclear/central sub-kiloparsec region and the ends of the bar (bar region) of spiral galaxies is not fully ...
  • Long-term ultraviolet variability of Seyfert galaxies 
    Sukanya, N; Stalin, C. S; Joseph, P; Rakshit, S; Praveen, D; Damle, R (Indian Academy of Sciences, 2018-12)
    Flux variability is one of the defining characteristics of Seyfert galaxies, a class of active galactic nuclei (AGN). Although these variations are observed over a wide range of wavelengths, results on their flux variability ...
  • Long-term ultraviolet variability of Seyfert galaxies 
    Sukanya, N; Stalin, C. S; Joseph, P; Rakshit, S; Praveen, D; Damle, R (Indian Academy of Sciences, 2018-12)
    Flux variability is one of the defining characteristics of Seyfert galaxies, a class of active galactic nuclei (AGN). Although these variations are observed over a wide range of wavelengths, results on their flux variability ...
  • More insights into bar quenching: Multi-wavelength analysis of four barred galaxies 
    George, K; Joseph, P; Mondal, C; Subramanian, S; Subramaniam, A; Paul, K. T (EDP Sciences, 2020-12)
    The underlying nature of the process of star formation quenching in the central regions of barred disc galaxies that is due to the action of stellar bar is not fully understood. We present a multi-wavelength study of four ...
  • Performance of the UVIT Level-2 pipeline 
    Ghosh, S. K; Tandon, S. N; Joseph, P; Devaraj, A; Shelat, D. S; Stalin, C. S (Indian Academy of Sciences, 2021-10)
    Performance of the Level-2 pipeline, which translates the UVIT data created by the ISRO’s ground segment processing systems (Level-1) into astronomer ready scientific data products, is described. This pipeline has evolved ...
  • Search for low-mass objects in the globular cluster M4. I. detection of variable stars 
    Safonova, M; Mkrtichian, D; Hasan, P; Sutaria, F. K; Brosch, N; Gorbikov, E; Joseph, P (IOP Publishing, 2016-02)
    With every new discovery of an extrasolar planet, the absence of planets in globular clusters ( GCs ) becomes more and more conspicuous. Null detection of transiting hot Jupiters in GCs 47 Tuc, ω Cen, and NGC 6397 ...
  • Smallest Scale Clumpy Star Formation in Stephan's Quintet Revealed from UV and IR Imaging 
    Joseph, P; George, K; Subramanian, S; Mondal, C; Subramaniam, A (IOP Publishing, 2022-09)
    The spatial distribution and physical sizes of star-forming clumps at the smallest scales provide valuable information on hierarchical star formation (SF). In this context, we report the sites of ongoing SF at ∼120 pc along ...
  • UVIT Observations of the Small Magellanic Cloud: Point-source Catalog 
    Devaraj, A; Joseph, P; Stalin, C. S; Tandon, S. N; Ghosh, S. K (American Astronomical Society, 2023-04-01)
    Three fields in the outskirts of the Small Magellanic Cloud were observed by the UltraViolet Imaging Telescope (UVIT) on board AstroSat, between 2017 December 31 and 2018 January 1. The observations were carried out on a ...
  • UVIT observations of the star-forming ring in NGC 7252: Evidence of possible AGN feedback suppressing central star formation 
    George, K; Joseph, P; Mondal, Chayan; Devaraj, A; Subramaniam, A; Stalin, C. S; Cote, P; Ghosh, S. K; Hutchings, J. B; Mohan, Rekhesh; Postma, J; Sankarasubramanian, K; Sreekumar, P; Tandon, S. N (EDP Sciences, 2018-05)
    Context. Some post-merger galaxies are known to undergo a starburst phase that quickly depletes the gas reservoir and turns it into a red-sequence galaxy, though the details are still unclear. Aims. Here we explore the ...
  • UVIT view of Centaurus A: a detailed study on positive AGN feedback 
    Joseph, P; Sreekumar, P; Stalin, C. S; Paul, K. T; Mondal, Chayan; George, Koshy; Mathew, Blesson (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)
    Supermassive black holes at the centre of active galactic nuclei (AGNs) produce relativistic jets that can affect the star formation characteristics of the AGN hosts. Observations in the ultraviolet (UV) band can provide ...

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