• Characterizing Optical Variability of OJ 287 in 2016–2017 

  Gupta, Alok C. et al.; Gaur, Haritma; Pandey, A. (The Astronomical Journal, 2019-03)

  We report on a recent multiband optical photometric and polarimetric observational campaign of the blazar OJ 287 that was carried out during 2016 September–2017 December. We employed nine telescopes in Bulgaria, China, ...
• Aerosol and pollutant characteristics in Delhi during a winter research campaign 

  Dumka, Umesh C. et al. (Environmental Science and Pollution Research, 2019-02)

  Urban areas in developing countries are major sources of carbonaceous aerosols and air pollutants, pointing out the need for a detailed assessment of their levels and origin close to the source. A multi-instrument research ...
• Optical Flux and Spectral Variability of the TeV Blazar PG 1553+113 

  Pandey, Ashwani; Gupta, Alok C.; Wiita, Paul J.; Tiwari, S. N. (The Astrophysical Journal, 2019-02)

  We present the results of our optical (VRI) observations of the TeV blazar PG 1553+113 over eight nights in 2016 April. We monitored the blazar quasi-simultaneously in V and R bands each night and examined the light ...
• General relativistic two-temperature accretion solutions for spherical flows around black holes 

  Sarkar, Shilpa; Chattopadhyay, Indranil (International Journal of Modern Physics D, 2019-02)

  Matter falling onto black holes is hot, fully ionized and has to be necessarily transonic. Since the electrons are responsible for radiative cooling via processes like synchrotron, bremsstrahlung and inverse-Compton, the ...
• Intra-night optical monitoring of three γ -ray detected narrow-line Seyfert 1 galaxies 

  Ojha, Vineet; Krishna, Gopal-; Chand, Hum (Monthly notices of the Royal Astronomical Society, 2019-03)

  For three radio-loud γ -ray detected narrow-line Seyfert 1 (γ -ray NLSy1) galaxies, we report optical variability on intra-night and/or week-like time-scales, based on five ≥ 3 h long monitoring sessions for each galaxy. ...

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