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3D Spectroscopy of the Blue Compact Dwarf Galaxies IZw18 and IIZw70

Published online by Cambridge University Press:  01 August 2006

C. Kehrig ,
J. M. Vílchez ,
S. F. Sanchez ,
L. Lopez-Martin ,
E. Telles  and
D. Martin-Gordón
C. Kehrig
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC) Camino Bajo de Huetor, Apartado 3004, 18080 Granada, Spain email: [email protected], [email protected] Observatório Nacional, Rua José Cristino, 77, E-20.921-400, Rio de Janeiro, Brazil
J. M. Vílchez
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC) Camino Bajo de Huetor, Apartado 3004, 18080 Granada, Spain email: [email protected], [email protected]
S. F. Sanchez
Affiliation:
Calar Alto Observatory (CAHA), Almería E-040004, Spain
L. Lopez-Martin
Affiliation:
Instituto de Astrofísica de Canarias, c/Vía Lctea s/n, 38200, La Laguna, Tenerife, Spain
E. Telles
Affiliation:
Observatório Nacional, Rua José Cristino, 77, E-20.921-400, Rio de Janeiro, Brazil
D. Martin-Gordón
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC) Camino Bajo de Huetor, Apartado 3004, 18080 Granada, Spain email: [email protected], [email protected]
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Abstract

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Blue compact dwarf (BCD) galaxies are low-metallicity objects undergoing violent star formation (Searle & Sargent 1972). We present our ongoing work on integral field spectroscopy (IFS) of the two prototypical BCD galaxies IIZw70 and IZw18 (Papaderos et al. 2002). Two-dimensional spectroscopy allows us to collect simultaneously the spectra of many different regions of an extended object, combining photometry and spectroscopy in the same data set. The great advantage of using IFS for the investigation of galaxies is that it allows us to obtain data on the galaxies' positions, velocity fields and star-forming properties all in one data cube. The observations were taken with the instruments INTEGRAL/WYFFOS at the WHT (ORM, La Palma) and PMAS installed on the 3.5m telescope at the CAHA, covering a spectral range from λ 3600 to 6800 Å. The data are mainly used to study the ionized gas and stellar clusters. Our main goal is to investigate the presence of spatial variations in ionization structure indicators, physical conditions and gaseous metal abundances, in these galaxies (Vílchez & Iglesias-Páramo 1998). We also study the kinematical properties of the ionized gas, as well as systematic variations of ionization structure and physical-chemical parameters as a function of the surface-brightness in Hα emission. Maps of the relevant emission lines are presented.

Keywords

ISM: ionization structureISM: HII regionsGalaxies: abundancesGalaxies: dwarf
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S237: Triggered Star Formation in a Turbulent ISM , August 2006 , pp. 433
Copyright
Copyright © International Astronomical Union 2007

References

Papaderos, P., Izotov, Y.I., Thuan, T.X. et al. 2002, A&A 393, 461Google Scholar
Searle, L. & Sargent, W.L.W. 1972, ApJ 173, 25CrossRefGoogle Scholar
V'ilchez, J.M. & Iglesias-Páramo, J. 1998, ApJ 508, 248CrossRefGoogle Scholar