Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..828c&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
In this talk I will discuss the science that can be done with high resolution spectroscopy at low radio frequencies. The discussion will be illustrated using applications drawn from recent observations of (1) extremely small (i.e. fainter than -12 (B) magnitudes as well as total HI mass less than ~ 107 solar masses) dwarf irregular galaxies and (2) highly redshifted atomic and molecular lines from damped lyman-alpha systems (DLAS). The high resolution observations of the the kinematics of extremely faint dwarf galaxies allows one to determine the structure of their dark matter halos which in turn has implications for hierarchical models of galaxy formation. For the high redshift systems the usefulness of high resolution observations for determining the physical conditions of the neutral atomic gas as well as for testing for variations in the values of fundamental constants will be highlighted. Most of the talk will focus on observations using the Giant Meterwave Radio Telescope but I will also briefly touch upon the potential for such observations with future more sensitive telescopes.
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