2010MNRAS.408.2234G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST06:58:33

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):

Integral field spectroscopy obtained with the Potsdam Multi-Aperture Spectrophotometer Fiber Package (PPak) and the 3.5-m telescope at the Calar Alto Observatory has been used to study an outer HII region complex in the well-studied galaxy NGC6946. 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 10000Å, allowing the measurement of the near-infrared [Siii] 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/cm3. The [Oiii] electron temperature was measured in knots A, B, C and in the integrated PPak field, and was found to be around 8000K. The temperatures of [Oii] and [Siii] were estimated in the four cases. The elemental abundances computed from the `direct method' are typical of high-metallicity disc HII 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 different 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 (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

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5134 1
2 NGC 604 HII 01 34 32.1 +30 47 01           ~ 544 0
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
5 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1734 1
6 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2544 2
7 NGC 5471 EmG 14 04 28.627 +54 23 52.84           ~ 230 1
8 Mrk 829 GiP 14 50 56.495 +35 34 18.27   14.5 14.83     ~ 194 0
9 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2234 2
10 HK NGC 6946 16 HII 20 35 21.133 +60 09 52.24           ~ 2 0
11 SN 1948B SN* 20 35 21.5 +60 10 16   14.0 14.0     SNIIP 68 1
12 HK NGC 6946 3 HII 20 35 25.1 +60 10 03           ~ 4 0
13 BD+28 4211 HS* 21 51 11.0220905905 +28 51 50.366090892 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 735 0
14 BD+17 4708 SB* 22 11 31.3751899315 +18 05 34.158392398 9.73 9.91 9.46 9.03 8.70 sdF8 535 0
15 HK NGC 6946 4 HII ~ ~           ~ 1 0
16 HK NGC 6946 2 HII ~ ~           ~ 1 0
17 HK NGC 6946 9 HII ~ ~           ~ 1 0
18 HK NGC 6946 6 HII ~ ~           ~ 1 0
19 HK NGC 6946 5 HII ~ ~           ~ 1 0
20 HK NGC 6946 13 HII ~ ~           ~ 1 0
21 HK NGC 6946 1 HII ~ ~           ~ 1 0
22 HK NGC 6946 14 HII ~ ~           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-06:58:33

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