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High resolution fabry-perot and multi-pupil spectral observations of the genuine blue compact dwarf galaxy IZW18

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Abstract

We present the observations of the BCDG IZW18 performed with a Fabry-Perot interferometer at the CFH 3.6 m telescope and with a multi-pupil spectrograph at the SAO (Russia) 6 m telescope. The morphological structure of the galaxy in emission lines and in continuum, the velocity field of the ionized gas, and [OIII]/H β ratio distribution along the NW component have been investigated. Besides the NW and SE HII components, we find a population of small HII regions. Continuum maps show that the peaks of the stellar light distribution are displaced with respect to the emission lines maxima. the velocity field shows peculiar motions superposed on an approximately regular background implying solid body rotation. Emission line profiles exhibit an asymmetric structure, except for the NW compact component. The [OIII]/H β ratio decreases from the center of the NW component to its edge with the gradient of 1.86 kpc−1.

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Authors and Affiliations

  1. Byurakan Astrophysical Observatory, Armenia

    A. R. Petrosian & T. Movsessian

  2. Marseille Observatory, France

    G. Comte, J. Boulesteix & E. Le Coarer

  3. Institut d'Astrophysique de Paris, France

    D. Kunth

  4. Special Astrophysical Observatory, Russia

    S. Dodonov & A. Burenkov

Authors
  1. A. R. Petrosian
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  2. G. Comte
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  3. J. Boulesteix
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  4. D. Kunth
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  5. T. Movsessian
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  6. S. Dodonov
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  7. E. Le Coarer
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  8. A. Burenkov
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Additional information

Published in Astrofizika, Vol. 38, No. 4, pp. 602–615, October–December, 1995.

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Petrosian, A.R., Comte, G., Boulesteix, J. et al. High resolution fabry-perot and multi-pupil spectral observations of the genuine blue compact dwarf galaxy IZW18. Astrophysics 38, 335–342 (1995). https://doi.org/10.1007/BF02044707

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  • DOI: https://doi.org/10.1007/BF02044707

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