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What are the various values of metallicity of various known galaxies, like Milky Way, Large Magellanic Cloud, Small Magellanic Cloud, Andromeda and so on?

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  • $\begingroup$ You mean, local universe? $\endgroup$ – Py-ser Jun 27 '14 at 2:08
  • $\begingroup$ Ya, I mean the local group in this universe. $\endgroup$ – MycrofD Jun 27 '14 at 4:25
  • $\begingroup$ Do you need the exact values? And just out of curiosity: why? $\endgroup$ – Py-ser Jun 27 '14 at 5:00
  • $\begingroup$ yup. i think i need.Working on something. ;). Wikipedia says LMC is 40% of milky and SMC is 10% of milky.but a scientific paper assumes LMC's as 0.008 while for SMC as 0.004. Things that can't be connected. $\endgroup$ – MycrofD Jun 27 '14 at 5:07
  • $\begingroup$ post the wiki page please. $\endgroup$ – Py-ser Jun 27 '14 at 5:16
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metallicity is a complicated issue, and giving just one number (usually Z, but also 12+log(O/H), ...) is very rough. But, here are the standard values for the Magellanic clouds:

LMC: Z~1/2

SMC: Z~1/5

with Z=1 being the solar value. Practically, the values will vary across any given galaxy (the Milky Way also has a metallicity gradient).

Reference:

Madden et al. 2014, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 125:600–635, 2013 June http://adsabs.harvard.edu/abs/2013PASP..125..600M

The article is also available on astroPH

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