Stellar velocity profiles and line-strengths out to four effective radii in the early-type Galaxy NGC 3379

Anne Marie Weijmans, Michele Cappellari, P. T. Zeeuw, Eric Emsellem, J. Falcon-Barroso, Harald Kuntschner, R. M. McDermid, R. C E Van Den Bosch, Glenn van de Ven

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

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 similar to 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.

Original languageEnglish
Title of host publicationGalaxy evolution
Subtitle of host publicationemerging insights and future challenges
EditorsS Jogee, Marinova, L Hao, GA Blanc
Place of PublicationSan Francisco, CA
PublisherASTRONOMICAL SOC PACIFIC
Pages179-182
Number of pages2
Volume419
ISBN (Electronic)9781583817193
ISBN (Print)9781583817186
Publication statusPublished - 2009
Externally publishedYes
EventInternational Conference on Galaxy Evolution: Emerging Insights and Future Challenges - Austin
Duration: 11 Nov 200814 Nov 2008

Publication series

NameAstronomical Society of the Pacific Conference Series
PublisherASTRONOMICAL SOC PACIFIC
Volume419

Conference

ConferenceInternational Conference on Galaxy Evolution
CityAustin
Period11/11/0814/11/08

Keywords

  • SAURON PROJECT
  • LENTICULAR GALAXIES
  • MODELS
  • HALOS

Cite this

Weijmans, A. M., Cappellari, M., Zeeuw, P. T., Emsellem, E., Falcon-Barroso, J., Kuntschner, H., ... de Ven, G. V. (2009). Stellar velocity profiles and line-strengths out to four effective radii in the early-type Galaxy NGC 3379. In S. Jogee, Marinova, L. Hao, & GA. Blanc (Eds.), Galaxy evolution: emerging insights and future challenges (Vol. 419, pp. 179-182). (Astronomical Society of the Pacific Conference Series; Vol. 419). San Francisco, CA: ASTRONOMICAL SOC PACIFIC.