Extended H-alpha emission from IRAS F10214 + 4724 - Starburst or active galactic nucleus?

Astronomy and Astrophysics – Astronomy

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Active Galactic Nuclei, H Alpha Line, Infrared Astronomy, Starburst Galaxies, Astronomical Models, Galactic Evolution, Star Formation

Scientific paper

We present a narrow-band image of H-alpha emission from the ultraluminous galaxy IRAS F 10214 + 4724. The H-alpha-emitting region is extended over 1.8 arcsec. From a comparison with other data, we conclude that the FWHM of the bulk of the H-alpha is at most about 450 km/s, though we cannot rule out a much weaker broad component. These results suggest the presence of a global starburst in IRAS F10214 + 4724. The H-alpha, radio continuum and bolometric luminosity can be explained by a starburst with a normal IMF but an enormous star formation rate. The inferred burst duration, total mass of stars formed during the burst and measured extent of the Ha emission support the view of IRAS F10214 + 4724 as a primeval galaxy undergoing its initial starburst. We also examine the implications of our results for AGN interpretations of IRAS F 10214 + 4724. IRAS F 10214 + 4724 provides evidence for the continuity in properties of AGN as the luminosity increases from Seyfert to QSO.

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