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Browsing by Author "Stalin, C. S"

Browsing by Author "Stalin, C. S"

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  • The peculiar radio-loud narrow line seyfert 1 galaxy 1H 0323+342 
    Paliya, Vaidehi S; Sahayanathan, S; Parker, M. L; Fabian, A. C; Stalin, C. S; Anjum, A; Pandey, S. B (IOP Publishing, 2014-07-10)
    We present a multi-wavelength study of the radio-loud narrow line Seyfert 1 galaxy (NLSy1), 1H 0323+342, detected by Fermi Gamma Ray Space Telescope. Multi-band light curves show many orphan X-ray and optical flares having ...
  • 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 ...
  • Polarimetric and spectroscopic study of radio quiet weak emission line quasars 
    Kumar, P; Chand, H; Srianand, R; Stalin, C. S; Petitjean, P; Gopal-Krishna (Oxford University Press on behalf of the Royal Astronomical Society, 2018-10)
    A small subset of optically selected radio-quiet quasars showing weak or no emission lines may turn out to be the elusive radio-quiet BL Lac objects, or simply be radio-quiet QSOs with a still-forming/shielded broad line ...
  • Properties of Narrow line Seyfert 1 galaxies 
    Rakshit, S; Stalin, C. S; Chand, H; Zhang, X (Bulletin de la Societe Royale des Sciences de Liege, 2018-04)
    Narrow line Seyfert 1 (NLSy1) galaxies constitute a class of active galactic nuclei characterized by the full width at half maximum (FWHM) of the Hα broad emission line <2000 km s-1 and the flux ratio of [O III] to Hα ...
  • Quasar catalogue for the astrometric calibration of the forthcoming ILMT survey 
    Mandal, A. K; Pradhan, Bikram; Surdej, Jean; Stalin, C. S; Sagar, R; Mathew, B (Indian Academy of Sciences, 2020-12)
    Quasars are ideal targets to use for astrometric calibration of large scale astronomical surveys as they have negligible proper motion and parallax. The forthcoming 4-m International Liquid Mirror Telescope (ILMT) will ...
  • RAD@home citizen science discovery of an active galactic nucleus spewing a large unipolar radio bubble on to its merging companion galaxy 
    Hota, Ananda; Dabhade, Pratik; Vaddi, Sravani; Konar, Chiranjib; Pal, Sabyasachi; Gulati, Mamta; Stalin, C. S; Avinash, Ck; Kumar, Avinash; Rajoria, Megha; Purohit, Arundhati (Oxford University Press on behalf of Royal Astronomical Society, 2022-11)
    Active galactic nucleus (AGN) feedback during galaxy merger has been the most favoured model to explain black hole–galaxy co-evolution. However, how the AGN-driven jet/wind/radiation is coupled with the gas of the merging ...
  • Rare Finding of a 100 Kpc Large, Double-lobed Radio Galaxy Hosted in the Narrow-line Seyfert 1 Galaxy SDSS J103024.95+551622.7 
    Rakshit, S; Stalin, C. S; Hota, A; Konar, C (IOP Publishing, 2018-12)
    Among the many varieties of active galactic nuclei (AGNs) known, narrow-line Seyfert 1 (NLSy1) galaxies are a puzzling class, particularly after the discovery of γ-ray emission in a handful of them using observations from ...
  • REMAP: Determination of the inner edge of the dust torus in AGN by measuring time delays 
    Mandal, A. K; Rakshit, S; Pal, I; Stalin, C. S; Sagar, R; Mathew, B. (Societe Royale des Sciences de Liege, 2019-10)
    Active galactic nuclei (AGN) are high luminosity sources powered by accretion of matter onto super-massive black holes (SMBHs) located at the centres of galaxies. According to the Unification model of AGN, the SMBH is ...
  • Reverberation mapping of the Seyfert 1.5 galaxy H 0507+164 
    Jeyakumar, S; Stalin, C. S; Coziol, R (Instituto de Astronomia, UNAM, 2011-10)
    Light curves of the continuum at 5100 °A and Hβ line are obtained from spectroscopic monitoring observations of the Seyfert 1.5 galaxy H 0507+164. The mass of the black hole is calculated based on cross-correlation ...
  • Search for coronal temperature variation in Seyfert galaxies 
    Pal, Indrani; Stalin, C. S (Oxford University Press on behalf of Royal Astronomical Society, 2023-01)
    While the temperature of the X-ray corona (kTe) in active galactic nuclei (AGNs) is known for many sources, its variation if any is limited to a handful of objects. This is in part due to the requirement of good signal-to-noise ...
  • Seeing and microthermal measurements near Devasthal top 
    Stalin, C. S; Sagar, R; Pant, P; Mohan, V; Kumar, B; Joshi, Y. C; Yadav, R. K. S; Joshi, S; Chandra, R; Durgapal, A. K; Uddin, W (Astronomical Society of India, 2001)
    Results of the seeing measurements carried out near Devasthal top on 43 nights during March to April 1999 are presented. Open air seeing measurements were carried out with a differential image motion monitor (DIMM) using ...
  • 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 ...

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