126 citations · 1.8k across the 84 of their papers we have counts for
7 papers · 1 filter
Magnetohydrodynamic turbulence in supernova remnants
Nirupam Roy, Somnath Bharadwaj, Prasun Dutta +1
We present estimates of the angular power spectra of the synchrotron radiation intensity fluctuations at 6 and 20 cm for the shell type supernova remnant Cas A and the filled-centr…
Turbulence measurements from HI absorption spectra
Nirupam Roy, Leshma Peedikakkandy, Jayaram N. Chengalur
We use the millennium Arecibo 21 cm absorption-line survey measurements to examine the issue of the non-thermal contribution to the observed Galactic HI line widths. If we assume a…
HI aperture synthesis and optical observations of the pair of galaxies NGC 6907 and 6908
S. Scarano, Felipe R. H. Madsen, Nirupam Roy +1
NGC 6908, a S0 galaxy situated in direction of NGC 6907, was only recently recognized as a distinct galaxy, instead of only a part of NGC 6907. We present 21 cm radio synthesis obs…
Occultation observation to probe the turbulence scale size in the plasma tail of comet Schwassmann-Wachmann 3-B
Nirupam Roy, P. K. Manoharan, Pavan Chakraborty
We present the occultation observation of compact radio source B0019-000 through the plasma tail of comet Schwassmann-Wachmann 3-B. The observation was made with the Ooty Radio Tel…
Critical properties of spherically symmetric accretion in a fractal medium
Nirupam Roy, Arnab K. Ray
Spherically symmetric transonic accretion of a fractal medium has been studied in both the stationary and the dynamic regimes. The stationary transonic solution is greatly sensitiv…
On spherically symmetrical accretion in fractal media
Nirupam Roy
We use fractional integrals to generalize the description of hydrodynamic accretion in fractal media. The fractional continuous medium model allows the generalization of the equati…