Galaxy Evolution: A Local Galaxian Mass-Metallicity ...

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Galaxy Evolution: A Local Galaxian Mass-Metallicity Relation

Name:Personal
Bagley, Megan M.
Role :Text(marcrelator)
creator

Name:Personal
Department of Astronomy and Physics; Dr. Chip Kobulnicky
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contributor

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still image
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Powerpoint/Pdf
Origin Information Place
Laramie, Wyoming

University of Wyoming
(keyDate="yes")
2008-04-26

Language:Text
Eng

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born digital

abstract
This project explores the luminosity-metallicity (L-Z) and mass-metallicity (M-Z) relations for a sample of local star-forming galaxies. Metallicity, the proportion of elements heavier than helium, is correlated with galaxy stellar mass, which underlies a more easily observable correlation with galaxy luminosity. It is thought that galaxian L-Z and M-Z relations evolve with redshift, but direct comparison between studies has been difficult because of the variety of methods used to derive metallicity and the lack of a secure estimate for these relations in the local universe. This local sample will therefore provide a basis for future studies of galaxy evolution. The results of four different calibrations between spectral emission line strengths and metallicity are evaluated, and local relations are presented using each. Luminosities and masses are derived from both optical B-band and Spitzer Infrared Array Camera 4.5 μm photometry. The M-Z relations have similar slopes and scatter for both wavelengths. However, we find that the choice of galaxy formation model used to derive stellar masses from photometric data can cause significant offsets in zero point, further emphasizing the need for uniformity of method in studies of the M-Z relation through cosmic time.
note
From - Undergraduate Research Day 2008 - Celebration of Research - Abstracts
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TBD

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Undergrauate Research Day 2008

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http://digital.uwyo.edu/copyright.html
Record Information languageOfCataloging :Text(ISO639-2B)
English
:Code(ISO639-2B)
eng