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Browsing by Author "Srianand, R"

Browsing by Author "Srianand, R"

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  • High-resolution spectroscopy of the relatively hydrogen-poor metal-rich giants in the globular cluster ω centauri 
    Hema, B. P; Pandey, G; Srianand, R (IOP Publishing, 2018-09)
    High-resolution optical spectra are analyzed for two of the four metal-rich, mildly hydrogen-poor or helium-enhanced giants discovered by Hema & Pandey, along with their comparison normal (hydrogen-rich) giants. The strengths ...
  • India-TMT project—science instrumentation program 
    Sivarani, T; Ramya, S; Sriram, S; Divakar, Devika; Surya, Arun; Varshney, Hari Mohan; Kambala, Sudarshan; Hasan, Amirul; Prakash, A; Govinda, K. V; Viswanatha; Anupama, G. C; Maheswar, G; Ojha, D; Pandey, S. B; Pandey, J; Puravankara, M; Ramaprakash, A. N; Reddy, B. E; Shah, Sarang; Srianand, R; Subramaniam, A; Subramanian, S (Indian Academy of Sciences, 2022-12)
    The future of astronomy in the coming decades will be shaped by the upcoming three extremely large optical telescopes, the Thirty Meter Telescope (TMT), the Giant Magellan Telescope (GMT) and the European Large Telescope ...
  • Multi-epoch intranight optical monitoring of eight radio-quiet BL Lac candidates 
    Kumar, P; Gopal-Krishna; Stalin, C. S; Chand, H; Srianand, R; Petitjean, P (Oxford University Press on behalf of the Royal Astronomical Society, 2017-10)
    For a new sample of eight weak-line quasars (WLQs) we report a sensitive search in 20 intranight monitoring sessions, for blazar-like optical flux variations on hour-like and longer time-scale (day/month/year-like). The ...
  • Obscured and powerful AGN and starburst activities at z ~ 3.5 
    Polletta, M; Omont, A; Berta, S; Bergeron, J; Stalin, C. S; Petitjean, P; Giorgetti, M; Trinchieri, G; Srianand, R; McCracken, H. J; Pei, Y; Dannerbauer, H (EDP Sciences, 2008-12)
    Aims. Short phases of coeval powerful starburst and AGN activity during the lifetimes of the most massive galaxies are predicted by various models of galaxy formation and evolution. In spite of their recurrence and high ...
  • Optical identification of XMM sources in the Canada-France-Hawaii telescope legacy survey 
    Stalin, C. S; Petitjean, P; Srianand, R; Fox, A. J; Coppolani, F; Schwope, A (Blackwell Publishing, 2010-01)
    We present optical spectroscopic identifications of X-ray sources in similar to 3 deg2 of the XMM-Large Scale Structure survey (XMM-LSS), also covered by the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS), obtained ...
  • 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 ...
  • Probing the central engine and environment of AGN using ARIES 1.3-m and 3.6-m telescopes 
    Chand, H; Rakshit, S; Jalan, P; Ojha, V; Srianand, R; Vivek, M; Mishra, S; Omar, A; Kumar, P; Joshi, R; Gopal Krishna; Kumar, R (Societe Royale des Sciences de Liege, 2018-04)
    : We discuss three long term observational programmes to probe the central engine and environment of active galactic nuclei (AGN) using the recently installed ARIES 1.3-m and 3.6-m telescopes. The first programme is on ...
  • Science with IUCAA telescope 
    Srianand, R; Gupta, R; Kembhavi, A; Ramaprakash, A. N; Tandon, S. N (Astronomical Society of India, 2002-09)
    We present a brief overview of the proposed astronomical observations using the first light instrument !FOSC for the WCAA 2 m telescope.
  • Study of quasar broad emission region from spectroscopy of multiple images 
    Narasimha, D; Srianand, R (Astronomical Society of India, 2000)
    Using the high resolution radio observations and analysis of the broad emission lines as well as continum in the optical spectra of the multiple images of quasars, we provide a method to probe the structure and dynamics ...
  • The WIRCAM Deep Infrared Cluster Survey I. Groups and clusters at z  ≳  1.1 
    Bielby, R. M; Finoguenov, A; Tanaka, M; McCracken, H. J; Daddi, E; Hudelot, P; Ilbert, O; Kneib, J. P; Le Fèvr, O; Mellier, Y; Nandra, K; Petitjean, P; Srianand, R; Stalin, C. S; Willott, C. J (EDP Sciences, 2010-12)
    We use a combination of CFHTLS deep optical data, WIRcam Deep Survey (WIRDS) near-infrared data and XMM-Newton survey data to identify z ≳ 1.1 clusters in the CFHTLS D1 and D4 fields. Counterparts to such clusters can not ...
  • X-ray and optical properties of broad absorption line quasars in the Canada–France–Hawaii Telescope Legacy Survey 
    Stalin, C. S; Srianand, R; Petitjean, P (Wiley-Blackwell, 2011-05)
    We study the X-ray and optical properties of 16 broad absorption line (BAL) quasars detected in a ≈3 deg2 region common to the wide synoptic (W-1) component of the Canada–France–Hawaii Telescope Legacy Survey (CFHTLS) and ...

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