Morphology and Evolution of Ultraluminous IR Galaxies

Details Morphology and Evolution of Ultraluminous IR Galaxies Morphology and Evolution of Ultraluminous IR Galaxies

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ap%26ss.269..399s&link_type=abstract

Astrophysics and Space Science, v. 269/270, p. 399-402 (1999).

Astronomy and Astrophysics

Astrophysics

Scientific paper

Ultraluminous infrared galaxies (ULIRGs) are probably the local analogues of a major mode of galaxy formation in the early universe. Here we give a brief progress report on our on-going programme to study the nature and evolution of ULIRGs. Our near-IR imaging of a large sample of these highly disturbed merger systems provides a data base of morphological parameters like tidal features or projected separation of the nuclei. Together with ISO Mid-IR spectroscopy these morphological parameters allow us to explore the merger dynamics and evolution of ULIRGs as they may progress from starburst to buried AGN to exposed QSO. We find that the fraction of ULIRGs predominantly powered by AGNs increases with luminosity above ~ 3 × 10^12 L_solar, but that there is no obvious trend for ULIRGs to be more AGN-like with more advanced merger phase.

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