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Annular Structure Analysis of the Starburst Spiral Galaxy NGC 7217

Published online by Cambridge University Press:  10 November 2010

G. Tenorio-Tagle
Affiliation:
Instituto de Astrofísica de Canarias, Tenerife
A. M. Varela
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea, E-38200 La Laguna, Tenerife, Spain
M. Prieto
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea, E-38200 La Laguna, Tenerife, Spain
A. K. Vivas
Affiliation:
Centro de Investigaciones de Astronomía, Apartado 264, Mérida, Estado de Mérida, Venezuela
C. Muñoz-Tuñon
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea, E-38200 La Laguna, Tenerife, Spain
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Summary

Circumnuclear starbursts can occur in galaxies with no notable companions. One of the consequences of this mechanism is to sweep out the star-forming gas from the few inner kiloparsec around the nucleus causing annular structures. Repeated starbursts (and perhaps the initial starburst itself) require a mechanism to feed new gas towards the axis of rotation. A dynamical process for this refuelling is based on the effects of departures from axisymmetry in the gravitational potential of the bulge, which can cause a net gaseous inflow, seen at its densest along a bar or bar-like structure, but also present for more generalized oval distortion. In an initial phase of the present work we have analysed the bulge component of a sample of spiral galaxies obtained using the 4.2-m WHT and the 2.5-m INT at the Observatorio del Roque de los Muchachos (La Palma). These galaxies present a starburst signature or exhibit evidence of residual phenomena from a previous starburst (see Beckman et al. 1991; Varela 1992). Seeing values oscillated between 0″·5 to 1″·4. Data reduction was performed using FIGARO and IRAF standard programs. We carried out a photometric analysis which enable us to perform a bulge/disc emission decomposition, in order to reconstruct that associated only with the bulge (Prieto et al. 1992a,b; Varela 1992).

Type
Chapter
Information
Violent Star Formation
From 30 Doradus to QSOs
, pp. 277 - 278
Publisher: Cambridge University Press
Print publication year: 1994

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  • Annular Structure Analysis of the Starburst Spiral Galaxy NGC 7217
    • By A. M. Varela, Instituto de Astrofísica de Canarias, Vía Láctea, E-38200 La Laguna, Tenerife, Spain, M. Prieto, Instituto de Astrofísica de Canarias, Vía Láctea, E-38200 La Laguna, Tenerife, Spain, A. K. Vivas, Centro de Investigaciones de Astronomía, Apartado 264, Mérida, Estado de Mérida, Venezuela, C. Muñoz-Tuñon, Instituto de Astrofísica de Canarias, Vía Láctea, E-38200 La Laguna, Tenerife, Spain
  • G. Tenorio-Tagle, Instituto de Astrofísica de Canarias, Tenerife
  • Book: Violent Star Formation
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511600159.047
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  • Annular Structure Analysis of the Starburst Spiral Galaxy NGC 7217
    • By A. M. Varela, Instituto de Astrofísica de Canarias, Vía Láctea, E-38200 La Laguna, Tenerife, Spain, M. Prieto, Instituto de Astrofísica de Canarias, Vía Láctea, E-38200 La Laguna, Tenerife, Spain, A. K. Vivas, Centro de Investigaciones de Astronomía, Apartado 264, Mérida, Estado de Mérida, Venezuela, C. Muñoz-Tuñon, Instituto de Astrofísica de Canarias, Vía Láctea, E-38200 La Laguna, Tenerife, Spain
  • G. Tenorio-Tagle, Instituto de Astrofísica de Canarias, Tenerife
  • Book: Violent Star Formation
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511600159.047
Available formats
×

Send book to Google Drive

To send content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about sending content to Google Drive.

  • Annular Structure Analysis of the Starburst Spiral Galaxy NGC 7217
    • By A. M. Varela, Instituto de Astrofísica de Canarias, Vía Láctea, E-38200 La Laguna, Tenerife, Spain, M. Prieto, Instituto de Astrofísica de Canarias, Vía Láctea, E-38200 La Laguna, Tenerife, Spain, A. K. Vivas, Centro de Investigaciones de Astronomía, Apartado 264, Mérida, Estado de Mérida, Venezuela, C. Muñoz-Tuñon, Instituto de Astrofísica de Canarias, Vía Láctea, E-38200 La Laguna, Tenerife, Spain
  • G. Tenorio-Tagle, Instituto de Astrofísica de Canarias, Tenerife
  • Book: Violent Star Formation
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511600159.047
Available formats
×