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- Center for Excellence in Basic SciencesIN83 papers
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11 papers · 1 filter
The spectral and temporal properties of an Ultra-Luminous X-ray source in NGC 6946
A. Senorita Devi, R. Misra, K. Shanthi +1
We report variability of the X-ray source, X-7, in NGC 6946, during a 60 ksec Chandra observation when the count rate decreased by a factor of ~1.5 in ~5000 secs. Spectral fitting…
Solar rotation rate and its gradients during cycle 23
H. M. Antia, Sarbani Basu, S. M. Chitre
Available helioseismic data now span almost the entire solar activity cycle 23 making it possible to study solar-cycle related changes of the solar rotation rate in detail. In this…
Zonal Velocity Bands and the Solar Activity Cycle
K. R. Sivaraman, H. M. Antia, S. M. Chitre +1
We compare the zonal flow pattern in subsurface layers of the Sun with the distribution of surface magnetic features like sunspots and polar faculae. We demonstrate that in the act…
Temporal Variations in the Sun's Rotational Kinetic Energy
H. M. Antia, S. M. Chitre, D. O. Gough
AIM: To study the variation of the angular momentum and the rotational kinetic energy of the Sun, and associated variations in the gravitational multipole moments, on a timescale o…
GMRT observations of the field of INTEGRAL X-ray sources- II (newly discovered hard X-ray sources)
M. Pandey, A. P. Rao, R. Manchanda +2
We have conducted low-frequency radio observations with the Giant Metrewave Radio Telescope (GMRT) of 40 new hard X-ray sources discovered by the INTEGRAL satellite. This survey wa…
GMRT observations of the field of INTEGRAL X-ray sources- I
M. Pandey, R. K. Manchanda, A. P. Rao +2
The INTEGRAL observatory has discovered a variety of hard X-ray sources in the Galactic plane since its launch. Using GMRT, we have made repeated observations of these sources to s…