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2013MNRAS.430..472L - Mon. Not. R. Astron. Soc., 430, 472-508 (2013/March-3)
Integral field spectroscopy of HII regions in M33.
LOPEZ-HERNANDEZ J., TERLEVICH E., TERLEVICH R., ROSA-GONZALEZ D., DIAZ A., GARCIA-BENITO R., VILCHEZ J. and HAGELE G.
Abstract (from CDS):
Local conditions within individual Hii regions are presented in the form of emission-line fluxes and physical conditions for each spatial resolution element (spaxel) and for segments with similar Hα surface brightness.
A clear dichotomy is observed when comparing the central to outer disc Hii regions. While the external Hii region has higher electron temperature plus larger Hβ equivalent width, size and excitation, the central region has higher extinction and metal content.
The dichotomy extends to the Baldwin-Phillips-Terlevich (BPT) diagnostic diagrams that show two orthogonal broad distributions of points. By comparing with pseudo-3D photoionization models, we conclude that the bulk of observed differences are probably related to a different ionization parameter and metallicity.
Wolf-Rayet (WR) features are detected in IC 132, and resolved into two concentrations whose integrated spectra were used to estimate the characteristic number of WR stars. No WR features were detected in the central Hii regions despite their higher metallicity.
Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
Journal keyword(s): ISM: abundances - Hii regions - galaxies: individual: M33
CDS comments: M33 X-8 = [TFP88] X-8
Simbad objects: 11
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