Free Access
Issue
Astron. Astrophys. Suppl. Ser.
Volume 128, Number 3, March II 1998
Page(s) 545 - 560
DOI https://doi.org/10.1051/aas:1998162
Published online 15 March 1998
DOI: 10.1051/aas:1998162

A&A Supplement series, Vol. 128, March II 1998, 545-560

Received September 16, 1996; accepted August 27, 1997

Physical properties of the ionized gas and brightness distribution in NGC4736gif

I. Rodriguestex2html_wrap645,gif - H. Dottoritex2html_wrap645 - J. Cepatex2html_wrap649,gif - J. Vilcheztex2html_wrap651,gif

Send offprint request: I. Rodrigues

tex2html_wrap653  Dep. de Astronomia, Instituto de Fı sica, Universidade Federal do Rio Grande do Sul, CP. 15051, Porto Alegre, 91501-970, RS, Brazil
e-mail: irapuan@if1.if.ufrgs.br; dottori@if1.if.ufrgs.br
tex2html_wrap655  Departamento de Astrofísica, Facultad de Física, Universidad de La Laguna, E-38071 La Laguna, Tenerife, Spain
tex2html_wrap657  Instituto de Astrofı sica de Canarias, E-38200 La Laguna, Tenerife, Spain
e-mail: jcn@iac.es; jvm@iac.es

Abstract:

In this work we study the galaxy NGC4736, using narrow band interference filters imaging centered at the emission lines [OII]tex2html_wrap_inline615, Htex2html_wrap_inline617 , [OIII]tex2html_wrap_inline619, Htex2html_wrap_inline621 , [SII]tex2html_wrap_inline623 and [SIII]tex2html_wrap_inline625 and nearby continua. We have obtained sizes, positions, emission line absolute fluxes, and continua intensities for 90 HII regions, mainly distributed in a ring-like structure of 3.2kpc in diameter. The Htex2html_wrap_inline621 luminosities are in the range tex2html_wrap_inline629. The HII regions size distribution presents a characteristic diameter tex2html_wrap_inline631 and verifies the relation tex2html_wrap_inline633. The temperature of the ionizing sources and the metallicity of the HII regions are respectively in the ranges tex2html_wrap_inline635K and tex2html_wrap_inline637. The masses of the ionizing clusters are in the range tex2html_wrap_inline639. The continua radial surface brightness distribution is better fitted by the superposition of a de Vaucouleurs', a thin and a thick exponential disk laws. The monochromatic colors show that outside the star forming ring the disk presents a younger stellar population than inside it.

keywords: galaxies: individual: NGC4736 -- galaxies: abundances -- galaxies: ISM -- galaxies: spiral -- galaxies: structure

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