Physics
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..261k&link_type=abstract
NOAO Proposal ID #2000A-0261
Physics
Scientific paper
We propose to investigate the detailed ionization state of gas in two matched samples of Compact Steep-Spectrum (CSS) and Gigahertz-Peaked Spectrum (GPS) radio galaxies, in order to determine the extent to which the radio jets are interacting with dense gas in the host galaxies of these sources. The compact size of these sources makes them an ideal probe of the physical processes that occur as the radio jets propagate through the host galaxy. Currently it is unclear whether these sources are intrinsically young, or are relatively old and confined by a dense medium. Understanding the extent to which the jets are interacting with the gas in the host galaxy is crucial in addressing this issue. We will use the R-C Spectrograph + T2KB detector on the KPNO 4-m telescope with the BL250 grating to obtain spectrophotometry of important diagnostic lines including high-ionization species such as [NeV]3426. We aim to investigate an intriguing possible relationship recently found between the gas ionization state and the radio properties, specifically the spectral turnover frequency, which correlates with the radio source size. Confirming or denying this type of relationship will provide a clear indication of how the jets interact with the gas as they propagate through the host galaxy ISM, thereby leading to a better understanding of how radio galaxies evolve and interact with their environments.
Baum Stefi
Koekemoer Anton
O'Dea Chris
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