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2010MNRAS.408.2234G - Mon. Not. R. Astron. Soc., 408, 2234-2255 (2010/November-2)
Integral field spectroscopy of HII region complexes: the outer disc of NGC6946.
GARCIA-BENITO R., DIAZ A., HAGELE G.F., PEREZ-MONTERO E., LOPEZ J., VILCHEZ J.M., PEREZ E., TERLEVICH E., TERLEVICH R. and ROSA-GONZALEZ D.
Abstract (from CDS):
Wolf-Rayet (WR) features have been detected in three of the knots, leading to a derived total number of WR stars of 125, 22 and 5 for knots A, C and B, respectively. The ratios of the numbers of WR to O stars are consistent with the prediction of Starburst99 for individual bursts with an age about 4Myr. Knot D, with no WR features, shows weak Hα emission, low excitation and the lowest Hβ equivalent width, all of which points to a more evolved state.
The integrated spectrum of the whole PPak FOV shows high excitation and a relatively evolved age that does not correspond to the individual knot evolutionary stages. Some effects associated with the loss of spatial resolution are also evidenced by the higher ionizing temperature that is deduced from the η' parameter measured in the integrated PPak spectrum with respect to that of the individual knots.
Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s): techniques: spectroscopic - ISM: abundances - HII regions
Nomenclature: Fig. 3: [GDH2010] A (Nos A-D).
Simbad objects: 22