Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-22T06:03:08.645Z Has data issue: false hasContentIssue false
  • English
  • Français

Regrowth of stellar disks in mature galaxies: The two component nature of NGC 7217 revisited with VIRUS-W†⋄

Published online by Cambridge University Press:  09 February 2015

Maximilian H. Fabricius ,
Lodovico Coccato ,
Ralf Bender ,
Niv Drory ,
Claus Gössl ,
Martin Landriau ,
Roberto P. Saglia ,
Jens Thomas  and
Michael J. Williams
Maximilian H. Fabricius
Affiliation:
Max Planck Institute for Extraterrestrial Physics, Giessenbachstraße, 85748 Garching, Germany University Observatory Munich, Scheinerstraße 1, 81679 Munich, Germany
Lodovico Coccato
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Straße 2, D-85748 Garching bei Muenchen, Germany
Ralf Bender
Affiliation:
Max Planck Institute for Extraterrestrial Physics, Giessenbachstraße, 85748 Garching, Germany University Observatory Munich, Scheinerstraße 1, 81679 Munich, Germany
Niv Drory
Affiliation:
McDonald Observatory, The University of Texas at Austin, 2515 Speedway, Stop C1402, Austin, Texas 78712-1206, USA
Claus Gössl
Affiliation:
University Observatory Munich, Scheinerstraße 1, 81679 Munich, Germany
Martin Landriau
Affiliation:
McDonald Observatory, The University of Texas at Austin, 2515 Speedway, Stop C1402, Austin, Texas 78712-1206, USA
Roberto P. Saglia
Affiliation:
Max Planck Institute for Extraterrestrial Physics, Giessenbachstraße, 85748 Garching, Germany
Jens Thomas
Affiliation:
Max Planck Institute for Extraterrestrial Physics, Giessenbachstraße, 85748 Garching, Germany
Michael J. Williams
Affiliation:
Max Planck Institute for Extraterrestrial Physics, Giessenbachstraße, 85748 Garching, Germany Department of Astronomy, Columbia University, New York 10027, 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 have obtained high spectral resolution (R ≈ 9000), integral field observations of the three spiral galaxies NGC 3521, NGC 7217 and NGC 7331 using the new fiber-based Integral Field Unit instrument VIRUS-W at the 2.7 m telescope of the McDonald Observatory in Texas. Our data allow us to revisit previous claims of counter rotation in these objects. A detailed kinematic decomposition of NGC 7217 shows that no counter rotating stellar component is present. We find that NGC 7217 hosts a low dispersion, rotating disk that is embedded in a high velocity dispersion stellar halo or bulge that is co-rotating with the disk. Due to the very different velocity dispersions (≈ 20 km s−1 vs. 150 km s−1) , we are further able to perform a Lick index analysis on both components separately which indicates that the two stellar populations are clearly separated in (Mgb,〈Fe〉) space. The velocities and dispersions of the faster component are very similar to those of the interstellar gas as measured from the [O iii] emission. Morphological evidence of active star formation in this component further suggests that NGC 7217 may be in the process of (re)growing a disk inside a more massive and higher dispersion stellar halo.

Keywords

galaxies: bulges — galaxies: evolution — galaxies: formation — galaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 81 - 84
Copyright
Copyright © International Astronomical Union 2015 

Footnotes

†

This paper includes data taken at The McDonald Observatory of The University of Texas at Austin.

⋄

This paper contains data obtained at the Wendelstein Observatory of the Ludwig-Maximilians University Munich.

References

Buta, R., van Driel, W., Braine, J., et al. 1995, ApJ, 450, 593Google Scholar
Coccato, L., Morelli, L., Corsini, E. M., et al. 2011, MNRAS, 412, L113Google Scholar
Coccato, L., Morelli, L., Pizzella, A., et al. 2013, A&A, 549, A3Google Scholar
Eliche-Moral, M. C., González-García, A. C., Balcells, M., et al. 2010, in AIP Conference Series, Vol. 1240, ed. Debattista, V. P. & Popescu, C. C., 237–238Google Scholar
Fabricius, M. H., Coccato, L., & Bender, R. 2014, MNRAS, 441, 2212Google Scholar
Fabricius, M. H., Grupp, F., Bender, R., et al. 2012, in SPIE Conference Series, Vol. 8446Google Scholar
Gorgas, J., Jablonka, P., & Goudfrooij, P. 2007, A&A, 474, 1081Google Scholar
Johnston, E. J., Aragón-Salamanca, A., Merrifield, M. R., & Bedregal, A. G. 2012, MNRAS, 422, 2590CrossRefGoogle Scholar
Mazzuca, L. M., Sarzi, M., Knapen, J. H., Veilleux, S., & Swaters, R. 2006, ApJ, 649, L79Google Scholar
Merrifield, M. R. & Kuijken, K. 1994, ApJ, 432, 575Google Scholar
Morelli, L., Pompei, E., Pizzella, A., et al. 2008, MNRAS, 389, 341CrossRefGoogle Scholar
Peng, C. Y., Ho, L. C., Impey, C. D., & Rix, H.-W. 2002, AJ, 124, 266CrossRefGoogle Scholar
Prada, F., Gutierrez, C. M., Peletier, R. F., & McKeith, C. D. 1996, ApJ, 463, L9+Google Scholar
Thomas, D., Maraston, C., & Bender, R. 2003, MNRAS, 343, 279Google Scholar
Thomas, D., Maraston, C., Bender, R., & Mendes de Oliveira, C. 2005, ApJ, 621, 673Google Scholar
Vergani, D., Pizzella, A., Corsini, E. M., et al. 2007, A&A, 463, 883Google Scholar
Zeilinger, W. W., VegaBeltrán, J. C. Beltrán, J. C., Rozas, M., et al. 2001, Ap&SS, 276, 643Google Scholar