Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541511p&link_type=abstract
American Astronomical Society, AAS Meeting #215, #415.11; Bulletin of the American Astronomical Society, Vol. 42, p.262
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a summary of existing observations of Galactic radio recombination lines (RRLs) at low ( MHz) frequencies, and discuss prospects for future studies with planned low frequency instruments including the Long Wavelength Array (LWA), Low Frequency Array (LOFAR), Square Kilometer Array (SKA-lo), and the Lunar Radio Array (LRA). RRLs at these frequencies appear in absorption, and contain a wealth of information on physical conditions in the absorbing clouds. They are thought to be associated with low-density regions of the ionized interstellar medium, but existing observations have not established the overall distribution or strength of these absorbers within the Galaxy. Further study is warranted as they may represent a frequency-dependent foreground for next-generation experiments trying to detect the H I signal from the Universe's Epoch of Reionization or Dark Ages (so-called "21-cm cosmology" observations).
Basic research in radio astronomy at the Naval Research Laboratory is funded by 6.1 Base funding.
Clarke Tracy
Kassim Namir
Lazio Joe
Peters Wendy M.
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