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http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1550| Integral field spectroscopy of HII region complexes. The outer disk of NGC 6946. | |
| Elena Kirilovsky Terlevich ROBERTO GIOVANNI TERLEVICH AFONSO DANIEL ROSA GONZALEZ | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| ISM: abundances H🇮🇮 regions | |
| Integral Field Spectroscopy obtained with PPak and the 3.5m telescope at the Calar Alto Observatory has been used to study an outer H🇮🇮 region complex in the well studied galaxy NGC 6946. This technique provides detailed maps of the region in different emission lines yielding spatially resolved information about the physical properties of the gas. The configuration was chosen to cover the whole spectrum from 3600 up to 10000 Å, allowing the measurement of the near infrared [S🇮🇮🇮] lines. We selected four luminous knots, to perform a detailed integrated spectroscopic analysis of these structures and of the whole PPak field-of-view (FOV). For all the knots the electron density has been found to be very similar and below 100 cm⁻³. The [OIII] electron temperature was measured in knots A, B, C and in the integrated PPak-field, and was found to be around 8000 K. The temperatures of [O🇮🇮] and [S🇮🇮🇮] were estimated in the four cases. The elemental abundances computed from the \direct method" are typical of high metallicity disk H🇮🇮 regions, with a mean value of 12+log(O/H)=8.65, comparable to what has been found in this galaxy by other authors for regions at similar galactocentric distance. Therefore, a remarkable abundance uniformity is found despite the di_erent excitations found throughout the nebula. However, due to the quality of the data, the electron temperatures and metallicities obtained, have associated errors comparable to the typical dispersion found in empirical calibrations. Wolf-Rayet 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 number of WR to O stars are consistent with the prediction of Starburst99 for individual bursts with an age about 4 Myr. 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 which does not correspond to the individual knot evolutionary stages. Some effects associated to the loss of spatial resolution could also be evidenced by the higher ionising temperature that is deduced from the η’ parameter measured in the integrated PPak spectrum with respect to that of the individual knots. | |
| Monthly Notices of the Royal Astronomical Society | |
| 2010 | |
| Artículo | |
| Inglés | |
| Estudiantes Investigadores Público en general | |
| García Benito, R., et al., (2010), Integral field spectroscopy of HII region complexes. The outer disk of NGC 6946, Monthly Notices of the Royal Astronomical Society, Vol. 408(4):2234 - 2255 | |
| ASTRONOMÍA Y ASTROFÍSICA | |
| Versión aceptada | |
| acceptedVersion - Versión aceptada | |
| Aparece en las colecciones: | Artículos de Astrofísica |
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