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Structure and evolution of star-forming gas in late-type spiral galaxies

Published online by Cambridge University Press:  01 December 2006

Kambiz Fathi
Affiliation:
Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain email: fathi@iac.es Stockholm Observatory, AlbaNova University Center, 106 91 Stockholm, Sweden
John E. Beckman
Affiliation:
Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain email: fathi@iac.es Consejo Superior de Investigaciones Científicas (SCIC), Spain
Almudena Zurita
Affiliation:
Depto. de Física Teórica y del Cosmos, Universidad de Granada, 18071 Granada, Spain
Mónica Relaño
Affiliation:
Depto. de Física Teórica y del Cosmos, Universidad de Granada, 18071 Granada, Spain
Johan H. Knapen
Affiliation:
Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain email: fathi@iac.es Centre for Astrophysics Research, University of Hertfordshire, Hatfield, Herts AL10 9AB, UK
Göran Östlin
Affiliation:
Stockholm Observatory, AlbaNova University Center, 106 91 Stockholm, Sweden
Claude Carignan
Affiliation:
Université de Montréal, C.P. 6128 succ. centre ville, Montréal, QC, CanadaH3C 3J7
Laurent Chemin
Affiliation:
Observatoire de Paris, Section Meudon, GEPI, CNRS-UMR 8111, Meudon, France
Olivier Daigle
Affiliation:
Université de Montréal, C.P. 6128 succ. centre ville, Montréal, QC, CanadaH3C 3J7
Olivier Hernandez
Affiliation:
Université de Montréal, C.P. 6128 succ. centre ville, Montréal, QC, CanadaH3C 3J7
Corresponding
E-mail address:
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Abstract

We study two dimensional Fabry-Perot interferometric observations of the nearby face-on late-type spiral galaxy, NGC 628. We investigate the role of the individual Hii regions together with the large-scale gravitational mechanisms which govern star formation and overall evolution in spiral galaxies. Our kinematical analysis (reinforced by literature maps in HI and CO at lower angular resolution) enables us to verify the presence of an inner rapidly rotating inner disk-like component which we attribute to long term secular evolution of the large-scale spiral arms and oval structure. We find that gas is falling in from the outer parts towards the bluer central regions. This could be an early phase in the formation of a pseudo-bulge. We find signatures of radial motions caused by an m = 2 perturbation, which are likely to be responsible for the inflow of material forming the circumnuclear ring and the rapidly rotating inner structure.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

References

Fathi, K., van de Ven, G., Peletier, R.F. et al. 2005, MNRAS, 364, 773CrossRefGoogle Scholar
Fathi, K., Beckman, J.E., Zurita, A. et al. 2007, A&A, submittedGoogle Scholar
Hernandez, O., Gach, J-L., Carignan, C., & Boulesteix, J. 2003, SPIE, 4841, 1472Google Scholar
Zurita, A., Relaño, M., Beckman, J.E., & Knapen, J.H. 2004, A&A, 413, 73Google Scholar

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