Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20311618d&link_type=abstract
American Astronomical Society Meeting 203, #116.18; Bulletin of the American Astronomical Society, Vol. 35, p.1399
Astronomy and Astrophysics
Astronomy
Scientific paper
Mixed (E/S0+S) pairs are the simplest examples of the galaxy interaction phenomenon because in principle they involve one gas rich fast rotator with a gas poor slow rotator. Such pairs offer an ideal opportunity to explore, not simply the interaction enhancement process, but the possibility of cross stimulation of the early-type component through transfer of gas from the spiral. If the early-type components are truly slow rotators then we might expect an active nucleus enhancement signature. Recent evidence from ISO/H-alpha studies of mixed pairs point toward an abundance of AGN/LINER/starbursts in the early-type components (Domingue et al. 2003).
Radio continuum surveys offer a special opportunity to study the signature in more detail because they resolve most of the pairs. We search for the presence of a radio enhancement in a large sample of mixed pairs using the NVSS(1.4Ghz) survey. Early-type components show radio detections in 29% of our pair sample. We also examine the radio/optical and radio/FIR flux distributions for the detected components as indicators of nuclear activity. The statistical significance of the detection fraction and luminosity ratios is evaluated in the light of results from a matching survey of radio emission for a sample of isolated early-type galaxies.
Domingue Donovan L.
Durbala Adriana
Sulentic Jack W.
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