Bibcode
DOI
García-Lorenzo, Begoña; Cairós, Luz M.; Caon, N.; Monreal-Ibero, Ana; Kehrig, Carolina
Referencia bibliográfica
The Astrophysical Journal, Volume 677, Issue 1, pp. 201-218.
Advertised on:
4
2008
Revista
Número de citas
33
Número de citas referidas
30
Descripción
We present results of integral field optical spectroscopy of five
luminous blue compact dwarf galaxies. The data were obtained using the
fiber system INTEGRAL attached to the William Herschel Telescope. The
galaxies Mrk 370, Mrk 35, Mrk 297, Mrk 314, and III Zw 102 were
observed. The central 33.6''×29.4'' regions
of the galaxies were mapped with a spatial resolution of 2.7"
spaxel-1, except for Mrk 314, in which we observed the
central 16''×12'' region with a resolution
of 0.9" spaxel-1. We use high-resolution optical images to
isolate the star-forming knots in the objects; line ratios, electron
densities, and oxygen abundances in each of these regions are computed.
We build continuum and emission-line intensity maps, as well as maps of
the most relevant line ratios: [O III] λ5007/Hβ, [N II]
λ6584/Hα, and Hα/Hβ, which allow us to obtain
spatial information on the ionization structure and mechanisms. We also
derive the gas velocity field from the Hα and [O III] λ5007
emission lines. We find that all five galaxies are in the high end of
the metallicity range of blue compact dwarfs with oxygen abundances
varying from Z~=0.3 to 1.5 Zsolar. The objects show H II-like
ionization in the whole field of view, except the outer regions of III
Zw 102, whose large [N II] λ6584/Hα values suggest the
presence of shocks. The five galaxies display inhomogeneous extinction
patterns, and three of them have high Hα/Hβ ratios,
indicative of a large dust content; all of the galaxies display complex,
irregular velocity fields in their inner regions.
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