H2 emission arises outside photodissociation regions in ultraluminous infrared galaxies

Nadia L. Zakamska ()
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Nadia L. Zakamska: Institute for Advanced Study, Einstein Drive, Princeton, New Jersey 08540, USA

Nature, 2010, vol. 465, issue 7294, 60-63

Abstract: Thinking outside the galaxy Spitzer Space Telescope observations of ultraluminous infrared galaxies show that the molecular hydrogen (H2) emission in these objects — often considered an indicator of star formation — originates not from starburst activity deep within the galaxies but from outside the galaxies' dusty central regions. These objects are among the most luminous in the local Universe and are thought to be powered by intense star formation. These observations by Nadia Zakamska point to an alternative origin for the H2, however. Zakamska proposes that the H2 emission is produced by shocks in the surrounding material, which are excited by interactions with nearby galaxies.

Date: 2010
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DOI: 10.1038/nature09037

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