230 citations · 1.1k across the 22 of their papers we have counts for
29 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…
HI and star formation in the most metal-deficient galaxies
Ekta, Jayaram N. Chengalur, S. A. Pustilnik
We present Giant Metrewave Radio Telescope (GMRT) observations for three (viz., DDO 68, SDSS J2104-0035 and UGC 772) of the six most metal-deficient actively star-forming galaxies…
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…
FIGGS: Faint Irregular Galaxies GMRT Survey - Overview, observations and first results
Ayesha Begum, Jayaram N. Chengalur, I. D. Karachentsev +2
The Faint Irregular Galaxies GMRT Survey (FIGGS) is a Giant Metrewave Radio Telescope (GMRT) based HI imaging survey of a systematically selected sample of extremely faint nearby d…
Baryonic Tully-Fisher Relation for Extremely Low Mass Galaxies
Ayesha Begum, Jayaram N. Chengalur, I. D. Karachentsev +1
We study Tully-Fisher relations for a sample that combines extremely faint (M_B > -14.0) galaxies along with bright (i.e. L_*) galaxies. Accurate (~ 10%) distances, I band photomet…
Foregrounds for redshifted 21 cm studies of reionization: GMRT 153 MHz observations
SK. Saiyad Ali, Somnath Bharadwaj, Jayaram N. Chengalur
Foreground subtraction is the biggest challenge for future redshifted 21 cm observations to probe reionization. We use a short GMRT observation at 153 MHz to characterize the stati…