NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T22:13:20 PDT
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For refcode 1992A&A...260..370C:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1992A&A...260..370C Density studies on giant extragalactic H II regions H.O. Castaneda, J.M. Vilchez, and M.V.F. Copetti Support Astronomy Group, Isaac Newton Group of Telescopes, Observatorio del Roque de los Muchachos, Spain Instituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, Spain Astronomy Centre, Sussex University, Falmer, Brighton BN 1 9QH, United Kingdom Universidade Federal de Santa Maria, Departamento de Matematica/NEPAE Received June 24, accepted November 26, 1991 Abstract. We report the results of a systematic study on the spatial variation of the electron density in a selected group of bright giant HII complexes in the galaxies M 101, M 51, and NGC 6822. Density values for the ionized gas of the regions have been obtained from the [S II] {lambda}6717/{lambda}6731 ratio, using long-slit spectrophotometry at high spectral and spatial resolution. Our study shows evidence that some of the regions present gradients in the distribution of the ionized gas, the brightest zones being associated with the maximum electron density values. For those cases where density variation is defined, different models that describe the internal gas density distribution have been considered and compared with the observations. We conclude that more realistic theoretical models of nebulae should take into account the internal density gradients within the regions. Key words: interestellar medium: H II regions: general
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