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I zw 18, a template for star-forming, z is greater than 7 galaxies
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hubeny, Ivan Heap, Sara R. |
| Copyright Year | 2011 |
| Description | I Zw 18-NW, one of the most primitive nearby dwarf galaxies, is arguably the best template we have for star-forming, very high-redshift galaxies (z>7). We have therefore obtained a far-UV spectrum of I Zw 18-NW using Hubble's Cosmic Origins Spectrograph (COS). The spectrum indicates star-formation over the past approx.10 Myr, a very low stellar metallicity, log Z/Zsun approx. -1.7, and high average stellar rotation rate, Vsini approx.200 km/s. Stellar wind lines are very weak, and the edge velocity of wind lines is very low (approx.250 km/s). The overall properties of I Zw 18-NW are consistent with theories of very low metallicity, rapidly rotating stars, e.g. Meynet et al. (2006). |
| File Size | 26932 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110008569 |
| Archival Resource Key | ark:/13960/t22c40r7h |
| Language | English |
| Publisher Date | 2011-04-01 |
| Access Restriction | Open |
| Subject Keyword | Astronomy Stellar Winds Red Shift Star Formation Galaxies Dwarf Galaxies Metallicity Stars Templates Stellar Rotation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
