NGC 1614 - an IR-luminous merger but not (yet?) an active galaxy

Astronomy and Astrophysics – Astronomy

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Active Galaxies, Infrared Sources (Astronomy), Active Galactic Nuclei, Charge Coupled Devices, Cosmic Dust, H Alpha Line, Infrared Astronomy Satellite, Very Large Array (Vla)

Scientific paper

New observations of the merging galaxy NGC 1614 are described. The system has a nuclear region of QSO-like luminosity, but shows no direct evidence for an active nucleus. It is heavily and unevenly reddened across its nucleus, while infrared imaging also shows a 'ridge' of dust. The inner spiral structure of the galaxy has normal rotation for an inclined disk, as indicated by the H-alpha emission. A linear 'tail' to the S and extended arms to the E have more positive velocities, and probably are the remains of an interacting companion and the tidal plume(s) caused by the collision. The only H I seen in emission appears to coincide with bright knots of H-alpha and forbidden O III emission of the base of the tail. The lack of direct evidence for an active nucleus indicates that if NGC 1614 is a precursor to a Seyfert-like system the AGN has not yet turned on.

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