Back to the Abstract

	1 Introduction
	2 Photoionization models for I Zw 18 NW
	3 Observations of I Zw 18
	4 New photoionization models for I Zw 18 NW
	5 Results
	6 Discussion
	7 Concluding remarks
	References
	Online Material
	Appendix A: Models for other GEHIIRs
	Appendix B: The gas distribution in GEHIIRs
	Appendix C: He II 4686, WR stars and SEDs
	Appendix D: Atomic data

	List of tables
	List of figures