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Browsing by Author "Stalin, C. S"

Browsing by Author "Stalin, C. S"

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  • The sharpest ultraviolet view of the star formation in an extreme environment of the nearest Jellyfish Galaxy IC 3418 
    Hota, Ananda; Devaraj, A; Pradhan, A. C; Stalin, C. S; George, Koshy; Mohapatra, Abhisek; Rey, Soo-Chang; Ohyama, Youichi; Vaddi, Sravani; Pechetti, Renuka; Ramya, S; Jose, Jessy; Roy, Jayashree; Konar, Chiranjib (Indian Academy of Sciences, 2021-10)
    We present the far ultraviolet (FUV) imaging of the nearest Jellyfish or Fireball galaxy IC3418/VCC 1217, in the Virgo cluster of galaxies, using Ultraviolet Imaging Telescope (UVIT) onboard the AstroSat satellite. The ...
  • Simultaneous MITSuME g'RCIC monitoring of S5 0716+714 
    Stalin, C. S; Kawabata, K. S; Uemura, M; Yoshida, M; Kawai, N; Yanagisawa, K; Shimizu, Y; Kuroda, D; Nagayama, S; Toda, H (Blackwell Publishing, 2009-11)
    We present the results of our intra-night optical flux monitoring observations of S5 0716+714 done simultaneously in g',RC and IC filters. The observations were done using the Multicolor Imaging Telescopes for Survey and ...
  • Site characterization for the UPSO-TIFR telescope 
    Sagar, R; Uddin, W; Pandey, A. K; Stalin, C. S; Mohan, V; Sanwal, B. B; Gupta, S. K; Yadav, R. K. S; Durgapal, A. K; Joshi, S; Kumar, B; Gupta, A. C; Joshi, Y; Srivastava, J. B; Chaubey, U. S; Singh, M; Pant, P; Gupta, K. G; Padalia, T. D (Astronomical Society of India, 2000)
    The Uttar Pradesh State Observatory, Naini Tal and Tata Institute of Fundamental Research, Mumbai plan to install jointly a 3 metre size optical telescope at Devasthal located east of Naini Tal about 50 km by road. The ...
  • Solar log gf values for the spectral lines in the range λ λ 6209-6273 Å 
    Stalin, C. S; Sinha, K; Sanwal, B. B (Astronomical Society of India, 1997)
    Utilizing Lieze solar atlas and solar photospheric models, we derived log gf values for the spectral lines in the wavelength range λλ 6209 - 6273 Å. These values, intended for use in a future study of high resolution reticon ...
  • Solar log gf values in the infrared J and H bands 
    Stalin, C. S; Trivedi, C; Sinha, K; Sanwal, B. B (Astronomical Society of India, 1997)
    Solar IR spectra have been utilized to derive log gf values for atomic lines due to 17 chemical elements. From a recent publication in Astronomy and Astrophysics Supplement, we selected unblended solar lines in the infrared ...
  • Spectral properties of quasars from sloan digital sky survey data release 14: the catalog 
    Rakshit, S; Stalin, C. S; Kotilainen, J (IOP Publishing, 2020-07)
    We present measurements of the spectral properties for a total of 526,265 quasars, out of which 63% have a continuum signal-to-noise ratio > 3 pixel−1, selected from the fourteenth data release of the Sloan Digital Sky ...
  • Spectroscopic reverberation mapping of Quasar PKS 0736 + 017: broad-line region and black-hole mass 
    Pandey, Shivangi; Rakshit, Suvendu; Woo, Jong-Hak; Stalin, C. S (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)
    To understand the mass distribution and co-evolution of supermassive black holes with their host galaxy, it is crucial to measure the black hole mass of AGN. Reverberation mapping is a unique tool to estimate the black ...
  • Star Formation in the Dwarf Seyfert Galaxy NGC 4395: Evidence for Both AGN and SN Feedback? 
    Nandi, Payel; Stalin, C. S; Saikia, D. J; Muneer, S; Mountrichas, George; Wylezalek, D; Sagar, R; Patig, M. K (American Astronomical Society, 2023-06-20)
    We present a detailed multiwavelength study of star formation in the dwarf galaxy NGC 4395, which hosts an active galactic nucleus (AGN). From our observations with the Ultra-Violet Imaging Telescope, we have compiled a ...
  • Strong lens time delay challenge. II. results of TDC1 
    Liao, K; Treu, T; Marshall, P; Fassnacht, C. D; Rumbaugh, N; Dobler, G; Aghamousa, A; Bonvin, V; Courbin, F; Hojjati, A; Jackson, N; Kashyap, V; Rathna Kumar, S; Linder, Eric; Mandel, Kaisey; Meng, Xiao-Li; Meylan, G; Moustakas, L. A; Prabhu, T. P; Romero-Wolf, A; Shafieloo, A; Siemiginowska, A; Stalin, C. S; Tak, H; Tewes, M; van Dyk, D (IOP Publishing, 2015-02-20)
    We present the results of the first strong lens time delay challenge. The motivation, experimental design, and entry level challenge are described in a companion paper. This paper presents the main challenge, TDC1, which ...
  • Study of correlation between optical flux and polarization variations in BL Lac objects 
    Rajput, Bhoomika; Pandey, Ashwani; Stalin, C. S; Mathew, Blesson (Oxford University Press on behalf of Royal Astronomical Society, 2022-12)
    Polarized radiation from blazars is one key piece of evidence for synchrotron radiation at low energy, which also shows variations. We present here our results on the correlation analysis between optical flux and polarization ...
  • Study of X-ray variability and coronae of Seyfert galaxies using NuSTAR 
    Priyanka Rani; Stalin, C. S; Goswami, K. D (Oxford University Press on behalf of the Royal Astronomical Society, 2019-04)
    The primary X-ray emission in active galactic nuclei (AGNs) originates in a compact region called the corona located very close to the supermassive black hole and the accretion disc. The knowledge of the cut-off energy ...
  • Surface photometry of three Wolf-Rayet galaxies 
    Singh, M; Sanwal, B. B; Stalin, C. S (Astronomical Society of India, 2001)
    CCD photometric observations of the Wolf-Rayet galaxies NGC 1741, IIZw40 and IRAS 01003-2238 were taken with 104 cm telescope of the U.P. State Observatory NainiTal using 1024 x 1024 CCD camera in B V R I and H? filters. ...
  • Temporal correlation between the optical and γ-ray flux variations in the blazar 3C 454.3 
    Rajput, Bhoomika; Stalin, C. S; Sahayanathan, S; Rakshit, S; Amit Kumar Mandal (Oxford University Press on behalf of the Royal Astronomical Society, 2019-06)
    Blazars show optical and γ-ray flux variations that are generally correlated, although there are exceptions. Here we present anomalous behaviour seen in the blazar 3C 454.3 based on an analysis of quasi-simultaneous data ...
  • Tests and calibration on ultra violet imaging telescope (UVIT) 
    Amit Kumar; Ghosh, S. K; Kamath, P. U; Postma, Joe; Kathiravan, S; Mahesh, P. K; Nagbhushana, S; Navalgund, K. H; Rajkumar, N; Rao, M. N; Sarma, K. S; Sriram, S; Stalin, C. S; Tandon, S. N (SPIE--The International Society for Optical Engineering, 2012-09)
    Ultra Violet Imaging Telescope on ASTROSAT Satellite mission is a suite of Far Ultra Violet (FUV; 130 – 180 nm), Near Ultra Violet (NUV; 200 – 300 nm) and Visible band (VIS; 320–550nm) imagers. ASTROSAT is a first ...
  • Tracking galaxy evolution through low-frequency radio continuum observations using SKA and citizen-science research using multi-wavelength data 
    Hota, A; Konar, C; Stalin, C. S; Vaddi, Sravani; Mohanty, Pradeepta K; Dabhade, Pratik; Arun, Sai; Bhoga, Dharmik; Rajoria, Megha; Sethi, Sagar (Indian Academy of Sciences, 2016-12)
    We present a brief review of progress in the understanding of general spiral and elliptical galaxies, through merger, star formation and AGN activities. With reference to case studies performed with the GMRT, we highlight ...
  • TXS 1206 + 549: a new γ -ray-detected narrow-line Seyfert 1 galaxy at redshift 1.34? 
    Rakshit, S; Schramm, Malte; Stalin, C. S; Tanaka, I; Paliya, Vaidehi S; Pal, Indrani; Kotilainen, Jari; Shin, Jaejin (Oxford University Press on behalf of the Royal Astronomical Society, 2021-06)
    Radio and γ-ray loud narrow-line Seyfert 1 galaxies (NLS1s) are unique objects to study the formation and evolution of relativistic jets, as they are believed to have high accretion rates and powered by low mass black holes ...
  • TXS 1433+205: The most distant gamma-ray emitting FR II radio galaxy 
    Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S (Oxford University Press on behalf of Royal Astronomical Society, 2023-03)
    The orientation of the jet axis to the line of sight of the observer plays a major role in explaining the phenomena observed from blazars and radio galaxies. In the γ -ray band, only a handful of radio galaxies have been ...
  • Ultraviolet Imaging Telescope on AstroSat 
    Tandon, S. N; Ghosh, S. K; Hutchings, J; Stalin, C. S; Subramaniam, A (Current Science Association, 2017-08)
    The AstroSat satellite is designed for multiwavelength astronomy for observations covering a spectral range from soft and hard X-rays to the ultraviolet. The Ultraviolet Imaging Telescope (UVIT) is the only non-X-ray ...
  • Ultraviolet Imaging Telescope on AstroSat 
    Tandon, S. N; Ghosh, S. K; Hutchings, J; Stalin, C. S; Subramaniam, A (Current Science Association, 2017-04)
    Solar coronagraph mimics total solar eclipse by blocking the solar disk and enabling the observation of extended coronal atmosphere of the Sun. Visible Emission Line Coronagraph (VELC), on-board Aditya-L1 space mission, ...
  • Unravelling the unusually curved X-ray spectrum of RGB J0710 + 591 using AstroSat observations 
    Goswami, Pranjupriya; Sinha, Atreyee; Chandra, Sunil; Misra, Ranjeev; Chitnis, Varsha; Gogoi, Rupjyoti; Sahayanathan, Sunder; Stalin, C. S; Singh, K. P; Yada, J. S (Oxford University Press on behalf of the Royal Astronomical Society, 2020-02)
    We report the analysis of simultaneous multiwavelength data of the high-energy-peaked blazar RGB J0710 + 591 from the Large Area X-ray Proportional Counters, Soft X-ray focusing Telescope, and Ultraviolet Imaging ...

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