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Oxford SWIFT IFS and multi-wavelength observations of the Eagle galaxy at z=0.77

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arxiv 1107.2931 v1 pith:73JSUJ3L submitted 2011-07-14 astro-ph.CO astro-ph.IM

Susan A. Kassin , L. Fogarty , T. Goodsall , F. J. Clarke , R. W. C. Houghton , G. Salter , N. Thatte , M. Tecza
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Roger L. Davies Benjamin J. Weiner C. N. A. Willmer Samir Salim Michael C. Cooper Jeffrey A. Newman Kevin Bundy C. J. Conselice A. M. Koekemoer Lihwai Lin Leonidas A. Moustakas Tao Wang
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keywords eagleaegisbrightextendedgalaxiesgalaxymulti-wavelengthoxford
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The `Eagle' galaxy at a redshift of 0.77 is studied with the Oxford Short Wavelength Integral Field Spectrograph (SWIFT) and multi-wavelength data from the All-wavelength Extended Groth strip International Survey (AEGIS). It was chosen from AEGIS because of the bright and extended emission in its slit spectrum. Three dimensional kinematic maps of the Eagle reveal a gradient in velocity dispersion which spans 35-75 +/- 10 km/s and a rotation velocity of 25 +/- 5 km/s uncorrected for inclination. Hubble Space Telescope images suggest it is close to face-on. In comparison with galaxies from AEGIS at similar redshifts, the Eagle is extremely bright and blue in the rest-frame optical, highly star-forming, dominated by unobscured star-formation, and has a low metallicity for its size. This is consistent with its selection. The Eagle is likely undergoing a major merger and is caught in the early stage of a star-burst when it has not yet experienced metal enrichment or formed the mass of dust typically found in star-forming galaxies.

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