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- W3100811206 abstract "We use neutral hydrogen (H I) and optical spectroscopic observations to compare the timescales of a merger event, starburst episode and radio-AGN activity in the radio galaxy B2 0648+27. We detect a large ring-like structure of H I in emission around the early-type host galaxy of B2 0648+27 (, diameter = 190 kpc). We interpret this as the result of a major merger that occurred ≳1.5 Gyr ago. From modelling optical long-slit spectra we find that a young stellar population of 0.3 Gyr, indicative of a past starburst event, dominates the stellar light throughout the galaxy. The off-set in time between the merger event and the starburst activity in B2 0648+27 suggests that the starburst was triggered in an advanced stage of the merger, which can be explained if the gas-rich progenitor galaxies contained a bulge. Although the exact age of the radio source remains uncertain, there appears to be a significant time-delay between the merger/starburst event and the current episode of radio-AGN activity. We also observe an outflow of emission-line gas in this system, which is likely related to superwinds driven by the stars that formed during the starburst event. We argue that the radio galaxy B2 0648+27 is a link in the evolutionary sequence between Ultra-Luminous Infrared Galaxies (ULIRGs) and genuine early-type galaxies." @default.
- W3100811206 created "2020-11-23" @default.
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- W3100811206 date "2006-07-01" @default.
- W3100811206 modified "2023-10-16" @default.
- W3100811206 title "Timescales of merger, starburst and AGN activity in radio galaxy B2 0648+27" @default.
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- W3100811206 doi "https://doi.org/10.1051/0004-6361:20054753" @default.
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