Stellar Velocity Profiles and Line-Strengths out to Four Effective Radii in the Early-Type Galaxy NGC 3379

1); (2) Oxford; (3) ESO; (4) CRAL/Observatoire de Lyon; (5) ESTEC; (6) Gemini Observatory; (7) University of Texas at Austin; (8) IAS Princeton); A. Weijmans (1); E. Emsellem (4)

arxiv: 0811.2840 · v1 · submitted 2008-11-18 · 🌌 astro-ph

Stellar Velocity Profiles and Line-Strengths out to Four Effective Radii in the Early-Type Galaxy NGC 3379

A. Weijmans (1) , M. Cappellari (2) , P.T. de Zeeuw (3 , 1) , E. Emsellem (4) , J. Falcon-Barroso (5) , H. Kuntschner (3) , R.M. McDermid (6)

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R.C.E. van den Bosch (7) G. van de Ven (8) ((1) Sterrewacht Leiden (2) Oxford (3) ESO (4) CRAL/Observatoire de Lyon (5) ESTEC (6) Gemini Observatory (7) University of Texas at Austin (8) IAS Princeton)

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keywords line-strengthsradiistellarearly-typeeffectivefourgalaxyvelocity

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We describe a new technique to measure stellar kinematics and line-strengths at large radii in nearby galaxies. Using the integral-field spectrograph SAURON as a 'photon-collector', we obtain spectra out to four effective radii (Re) in the early-type galaxy NGC 3379. By fitting orbit-based models to the extracted stellar velocity profile, we find that ~40% of the total mass within 5 Re is dark. The measured absorption line-strengths reveal a radial gradient with constant slope out to 4 Re.

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Stellar Velocity Profiles and Line-Strengths out to Four Effective Radii in the Early-Type Galaxy NGC 3379

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