A High Galactic Latitude HI 21cm-line Absorption Survey using the GMRT: I. Observations and Spectra
Abstract
We have used the Giant Meterwave Radio Telescope (GMRT) to measure the Galactic HI 21-cm line absorption towards 102 extragalactic radio continuum sources, located at high (|b| >15deg.) Galactic latitudes. The Declination coverage of the present survey is Decl. ~ -45deg.. With a mean rms optical depth of ~0.003, this is the most sensitive Galactic HI 21-cm line absorption survey to date. To supplement the absorption data, we have extracted the HI 21-cm line emission profiles towards these 102 lines of sight from the Leiden Dwingeloo Survey of Galactic neutral hydrogen. We have carried out a Gaussian fitting analysis to identify the discrete absorption and emission components in these profiles. In this paper, we present the spectra and the components. A subsequent paper will discuss the interpretation of these results.
Cite
@article{arxiv.astro-ph/0410626,
title = {A High Galactic Latitude HI 21cm-line Absorption Survey using the GMRT: I. Observations and Spectra},
author = {Rekhesh Mohan and K. S. Dwarakanath and G. Srinivasan},
journal= {arXiv preprint arXiv:astro-ph/0410626},
year = {2009}
}
Comments
46 pages, Accepted for publication in Journal of Astrophysics & Astronomy