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Properties of Massive Stars in Primitive GalaxiesAccording to R. Dave, the phases of galaxy formation are distinguished by their halo mass and governing feedback mechanism. Galaxies in the birth phase (our "primitive galaxies") have a low halo mass (M<10(exp 9) Msun); and star formation is affected by photoionizing radiation of massive stars. In contrast, galaxies in the growth phase (e.g. Lyman Break galaxies) are more massive (M=10(exp 9)-10(exp 12) Msun); star formation is fueled by cold accretion but modulated by strong outflows from massive stars. I Zw 18 is a local blue, compact dwarf galaxy that meets the requirements for a birth-phase galaxy: halo mass <10(exp 9) Msun, strong photo ionizing radiation, no galactic outflow, and very low metallicity, log(O/H)=7.2. We will describe the properties of massive stars in I Zw 18 based on analysis of ultraviolet spectra obtained with HST.
Document ID
20120012830
Acquisition Source
Goddard Space Flight Center
Document Type
Abstract
Authors
Heap, Sara (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 26, 2013
Publication Date
May 21, 2012
Subject Category
Astrophysics
Report/Patent Number
GSFC.ABS.6263.2012
Report Number: GSFC.ABS.6263.2012
Meeting Information
Meeting: First Stars IV: From Hayashi to the Future
Location: Kyoto
Country: Japan
Start Date: May 21, 2012
End Date: May 25, 2012
Sponsors: Kyoto Univ.
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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