Hostname: page-component-78c5997874-ndw9j Total loading time: 0 Render date: 2024-11-13T09:26:49.370Z Has data issue: false hasContentIssue false
  • English
  • Français

The Nature of Galactic Bulges from SAURON Absorption Line Strength Maps

Published online by Cambridge University Press:  01 December 2006

Reynier F. Peletier ,
Jesús Falcón-Barroso ,
Katia Ganda ,
Roland Bacon ,
Michele Cappellari ,
Roger L. Davies ,
P. Tim de Zeeuw ,
Eric Emsellem ,
Davor Krajnović  and
Harald Kuntschner
...Show all authors
Reynier F. Peletier
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, NL-9700 AV Groningen email: peletier@astro.rug.nl
Jesús Falcón-Barroso
Affiliation:
European Space Agency/ESTEC, Keplerlaan 1, NL-2200 AG Noordwijk
Katia Ganda
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, NL-9700 AV Groningen email: peletier@astro.rug.nl
Roland Bacon
Affiliation:
Observatoire de Lyon, 9 av. Charles André, F-69230 Saint-Genis Laval
Michele Cappellari
Affiliation:
Sub-Department of Astrophysics, University of Oxford, Oxford OX1 3RH, UK
Roger L. Davies
Affiliation:
Sub-Department of Astrophysics, University of Oxford, Oxford OX1 3RH, UK
P. Tim de Zeeuw
Affiliation:
Sterrewacht Leiden, University of Leiden, NL-2333 CA Leiden
Eric Emsellem
Affiliation:
Observatoire de Lyon, 9 av. Charles André, F-69230 Saint-Genis Laval
Davor Krajnović
Affiliation:
Sub-Department of Astrophysics, University of Oxford, Oxford OX1 3RH, UK
Harald Kuntschner
Affiliation:
ST-ECF, European Southern Observatory, D-85748 Garching bei München
Richard M. McDermid
Affiliation:
Sterrewacht Leiden, University of Leiden, NL-2333 CA Leiden
Marc Sarzi
Affiliation:
Centre for Astrophysics Research, University of Hertfordshire, Hatfield, UK
Glenn van de Ven
Affiliation:
Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540, USA
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We discuss SAURON absorption line strength maps of a sample of 24 early-type spirals, mostly Sa. From the Lick indices Hβ, Mgb and Fe 5015 we derive SSP-ages and metallicities. By comparing the scaling relations of Mg b and Hβ and central velocity dispersion with the same relation for the edge-on sample of Falcón-Barroso et al. (2002) we derive a picture in which the central regions of Sa galaxies contain at least 2 components: one (or more) thin, disc-like component, often containing recent star formation, and another, elliptical-like component, consisting of old stars and rotating more slowly, dominating the light above the plane. If one defines a bulge to be the component responsible for the light in excess of the outer exponential disc, then many Sa-bulges are dominated by a thin, disc-like component containing recent star formation.

Keywords

galaxies: spiralgalaxies: stellar contentgalaxies: bulges
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 485 - 488
Copyright
Copyright © International Astronomical Union 2007

References

Athanassoula, E. 2005, MNRAS, 358, 1477CrossRefGoogle Scholar
Bender, R., Burstein, D., & Faber, S. M., 1993, ApJ, 411, 153Google Scholar
de Zeeuw, P. T. 2002, MNRAS, 329, 513Google Scholar
Emsellem, E., Greusard, D., et al. , 2001, A&A, 368, 52Google Scholar
Emsellem, E., Cappellari, M.Krajnovic, D., et al. , 2007, MNRAS, submittedGoogle Scholar
Falcón-Barroso, J., Peletier, R. F., & Balcells, M., 2002, MNRAS, 335, 741, FB02CrossRefGoogle Scholar
Falcón-Barroso, J., et al. 2006, MNRAS, 369, 529Google Scholar
Ganda, K., Falcón-Barroso, J., Peletier, R. F., et al. , 2006, MNRAS, 367, 46Google Scholar
Jablonka, P., Martin, P., & Arimoto, N., 1996, AJ, 112, 1415Google Scholar
Jørgensen, I., Franx, M., & Kjaergaard, P., 1996, MNRAS, 280, 167CrossRefGoogle Scholar
Kormendy, J., & Kennicutt, R. C., 2004, ARA&A, 42, 603Google Scholar
Kuntschner, H., et al. , 2006, MNRAS, 369, 497Google Scholar
Moorthy, B. K., & Holtzman, J. A. 2006, MNRAS, 371, 583Google Scholar
Peletier, R. F., & Balcells, M. 1996, AJ, 111, 2238Google Scholar
Peletier, R. F., et al. , 2007, MNRAS, sbmitted.Google Scholar
Proctor, R. N., & Sansom, A. E., 2002, MNRAS, 333, 517Google Scholar
Prugniel, P., Maubon, G., & Simien, F., 2001, A&A, 366, 68Google Scholar
Sarzi, M., et al. 2006, MNRAS, 366, 1151CrossRefGoogle Scholar
Schweizer, F., Seitzer, P., et al. , 1990, ApJ, 364, L33Google Scholar
Terlevich, R., Davies, R. L., Faber, S. M., & Burstein, D. 1981, MNRAS, 196, 381Google Scholar
Trager, S. C., Faber, S. M., Worthey, G., & González, J. J., 2000, AJ, 119, 1645Google Scholar
Vazdekis, A. 1999, ApJ, 513, 224Google Scholar