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Polarimetric imaging with the GMRT
Sanhita Joshi, Jayaram Chengalur
We present the first set of polarimetric images made with the GMRT. These were obtained as part of the program to commission the polarization mode at the telescope. We find that th…
GMRT observation towards detecting the Post-reionization 21-cm signal
Abhik Ghosh, Somnath Bharadwaj, Sk. Saiyad Ali +1
We have analyzed 610 MHz GMRT observations towards detecting the redshifted 21-cm signal from z=1.32. The multi-frequency angular power spectrum C_l(Delta nu) is used to characteri…
Probing fundamental constant evolution with redshifted conjugate-satellite OH lines
Nissim Kanekar, Jayaram N. Chengalur, Tapasi Ghosh
We report Westerbork Synthesis Radio Telescope and Arecibo Telescope observations of the redshifted satellite OH-18cm lines at towards PKS1413+135. The "conjugate" n…
Turbulence in the Harassed Galaxy NGC 4254
Prasun Dutta, Ayesha Begum, Somnath Bharadwaj +1
Galaxy harassment is an important mechanism for the morphological evolution of galaxies in clusters. The spiral galaxy NGC 4254 in the Virgo cluster is believed to be a harassed ga…
A search for the 55 MHz OH line
Visweshwar Ram Marthi, Jayaram N. Chengalur
The OH molecule, found abundantly in the Milky Way, has four transitions at the ground state rotational level(J = 3/2) at cm wavelengths. These are E1 transitions between the F+ an…
When are extremely metal-deficient galaxies extremely metal-deficient?
B. Ekta, Jayaram N. Chengalur
Extremely metal-deficient (XMD) galaxies, by definition, have oxygen abundances \le 1/10 solar, and form a very small fraction of the local gas-rich, star-forming dwarf galaxy popu…