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Browsing by Author "Goyal, A."

Browsing by Author "Goyal, A."

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  • Further evidence for intra-night optical variability of radio-quiet quasars 
    Goyal, A.; Krishna, G.; Sagar, R.; Anupama, G. C.; Sahu, D. K. (2007)
    Although well established for BL Lac objects and radio-loud quasars, the occurrence of intra-night optical variability (INOV) in radio-quiet quasars is still debated, primarily since only a handful of INOV events with ...
  • Improved characterization of intranight optical variability of prominent AGN classes 
    Goyal, A.; Gopal-Krishna; Witta, P. J.; Stalin, C. S.; Sagar, R. (Oxford University Press, 2013)
    The incidence of intranight optical variability (INOV) is known to differ significantly among different classes of powerful active galactic nuclei (AGN). A number of statistical methods have been employed in the literature ...
  • Intra-night optical variability of core dominated radio quasars: the role of optical polarization 
    Goyal, A.; Gopal-Krishna; Witta, P. J; Anupama, G. C.; Sahu, D. K.; Sagar, R.; Joshi, S. (2012)
    Context. Rapid variations in optical flux are seen in many quasars and all blazars. The amount of variability in different classes of active galactic nuclei has been studied extensively but many questions remain ...
  • Optical variability of radio-intermediate quasars 
    Goyal, A.; Krishna-Gopal; Joshi, S.; Sagar, R.; Wiita, P. J.; Anupama, G. C. (2010)
    We report the results of our intensive intranight optical monitoring of eight optically bright ‘radio-intermediate quasars’ (RIQs) having flat or inverted radio spectra. The monitoring was carried out in R band on ...
  • Prolonged intranight optical quiescence of the classical BL Lac object PKS 0735+178 
    Goyal, A.; Gopal-Krishna; Anupama, G. C.; Sahu, D. K.; Sagar, R.; Britzen, S.; Karazous, M.; Aller, M. F.; Aller, H. D. (2009)
    We report our extensive intranight optical monitoring of the well known low-energy peaked (LBL) BL Lac object PKS 0735+178. This long-term follow-up consists of R-band monitoring for a minimum duration of ∼ 4 hours, on 17 ...
  • Rapid optical variability of TeV blazars 
    Gopal-Krishna; Goyal, A.; Joshi, S.; Karthick, C.; Sagar, R.; Wiita, P. J.; Anupama, G. C.; Sahu, D. K. (2011)
    In this first systematic attempt to characterize the intranight optical variability (INOV) of TeVdetected blazars, we have monitored a well-defined set of nine TeV blazars on total 26 nights during 2004–10. In this R- or ...
  • Unusual optical quiescence of the classical BL Lac object PKS 0735+178 on intranight time-scale 
    Goyal, A.; Krishna-Gopal; Anupama, G. C.; Sahu, D. K.; Sagar, R.; Britzen, S.; Karouzos, M.; Aller, M. F.; Aller, H. D. (2009)
    We present the result of our extensive intranight optical monitoring of the well-known low- energy peaked BL Lac (LBL) object PKS 0735+178. This long-term follow-up consists of R-band monitoring for a minimum duration ...
  • Young stellar population and ongoing star formation in the H II complex Sh2-252 
    Jose, J.; Pandey, A. K.; Samal, M. R.; Ojha, D. K.; Ogura, K.; Kim, J. S.; Kobayashi, N.; Goyal, A.; Chauhan, N.; Easwaraia, C. (Wiley Online, 2013-07-11)
    In this paper, an extensive survey of the star-forming complex Sh2-252 has been undertaken with an aim to explore its hidden young stellar population as well as to understand the structure and star formation history for ...

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