2008A&A...477..813K


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.18CET06:02:34

2008A&A...477..813K - Astronomy and Astrophysics, volume 477, 813-822 (2008/1-3)

The interplay between ionized gas and massive stars in the HII galaxy IIZw70: integral field spectroscopy with PMAS.

KEHRIG C., VILCHEZ J.M., SANCHEZ S.F., TELLES E., PEREZ-MONTERO E. and MARTIN-GORDON D.

Abstract (from CDS):

We performed an integral field spectroscopic study for the HII galaxy IIZw70 to investigate the interplay between its ionized interstellar medium (ISM) and the massive star formation. Observations were taken in the optical spectral range from λ3700Å-6800Å with the Potsdam Multi-Aperture Spectrophotometer (PMAS) attached to the 3.5m telescope at Calar Alto Observatory. We created and analyzed maps of spatially distributed emission-lines (at different stages of excitation), continuum emission, and properties of the ionized ISM (ionization structure indicators, physical-chemical conditions, dust extinction, kinematics). We investigated the relation of these properties to the spatial distribution and evolutionary stage of the massive stars. For the first time we have detected Wolf-Rayet (WR) stars in this galaxy. The peak of the ionized gas emission coincides with both the location of the maximum of the stellar continuum emission and the WR bump. The region of the galaxy with lower dust extinction corresponds to the region that shows the lowest values of velocity dispersion and radial velocity. The overall picture suggests that the ISM of this region is being disrupted via photoionization and stellar winds, leading to a spatial decoupling between gas+stars and dust clouds. The bulk of dust appears to be located at the boundaries of the region occupied by the probable ionizing cluster. We also found that this region is associated to the nebular emission in HeIIλ4686 and to the intensity maximum of most emission lines. This indicates that the hard ionizing radiation responsible for the HeIIλ4686 nebular emission can be related to the youngest stars. Within ∼0.4x0.3kpc2 in the central burst, we derived oxygen abundances using direct determinations of Te[OIII]. We found abundances in the range 12+log(O/H)=7.65-8.05, yielding an error-weighted mean of 12+log(O/H)=7.86±0.05 that has been taken as the representative oxygen abundance for IIZw70.

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Journal keyword(s): techniques: spectroscopic - ISM: abundances - ISM: HII regions - galaxies: dwarf - galaxies: ISM - galaxies: abundances

Simbad objects: 12

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Number of rows : 12

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 NGC 1036 G 02 40 28.982 +19 17 49.48   13.5       ~ 106 0
2 SBSG 0335-052B G 03 37 44.04 -05 02 40.2   16.77 16.65   16.79 ~ 140 1
3 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1138 3
4 NGC 1705 SBG 04 54 13.500 -53 21 39.82 12.32 12.96 12.56 12.58 12.9 ~ 580 1
5 NGC 2363 G 07 28 29.83 +69 11 32.8   15.5       ~ 244 1
6 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 536 3
7 HZ 44 HS* 13 23 35.2632775627 +36 07 59.545982652 10.186 11.42 11.65 12.00 11.995 sdBN0VIIHe28 363 0
8 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1247 4
9 Mrk 829 GiP 14 50 56.495 +35 34 18.27   14.5 14.83     ~ 192 0
10 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1408 0
11 BD+28 4211 HS* 21 51 11.0220905905 +28 51 50.366090892 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 724 0
12 NAME Local Group GrG ~ ~           ~ 6679 0

    Equat.    Gal    SGal    Ecl

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2019.11.18-06:02:34

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