A high galactic latitude HI 21 cm-line absorption survey using the GMRT: I. Observations and spectra |
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| Authors: | Rekhesh Mohan K S Dwarakanath G Srinivasan |
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| Institution: | (1) Raman Research Institute, 560 080 Bangalore, India;(2) Present address: Indian Institute of Astrophysics, 560 034 Bangalore, India |
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| 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| > 15°) Galactic latitudes. The Declination coverage of the present survey is δ}> - 45°. 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. |
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| Keywords: | ISM: clouds kinematics and dynamics radio lines: ISM |
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