Far-infrared spectroscopy and near-infrared imaging of Mrk 231

Physics

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Galaxies: Starburst, Active, Infrared: Galaxies, Infrared: Ism: Lines And Bands

Scientific paper

We present far-infrared spectroscopy of the ultraluminous infrared Seyfert 1 galaxy Mrk 231 obtained with the ISO Long Wavelength Spectrometer. These far-infrared observations reveal a far-infrared spectrum different from classical starburst galaxies and lower luminosity infrared bright galaxies. Like the prototypical ultraluminous infrared galaxy Arp 220, the far-infrared spectrum shows weak or absent far-infrared emission lines and many strong absorption lines. Near-infrared 3.3 μm dust feature observations for this source also reveal a LFIR/L3.3μ m ratio that is higher than that of M82, the prototypical starburst galaxy. We combine these near-infrared imaging observations with the ISO spectroscopy and discuss the origin of the dominant luminosity source in the galaxy.

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