THE MASS–METALLICITY AND LUMINOSITY–METALLICITY RELATIONS FROM DEEP2 AT z ∼ 0.8

By H. Zahid, Lisa J. Kewley, F. Bresolin. 2010

153 citations recorded by the source corpus.

We present the mass–metallicity (MZ) and luminosity–metallicity (LZ) relations at z ∼ 0.8 from ∼1350 galaxies in the Deep Extragalactic Evolutionary Probe 2 survey. We determine stellar masses by fitting the spectral energy distribution inferred from photometry with current stellar population synthesis models. This work raises the number of galaxies with metallicities at z ∼0.8 by more than an order of magnitude. We investigate the evolution in the MZ and LZ relations in comparison with local MZ and LZ relations determined in a consistent manner using ∼21, 000 galaxies in the Sloan Digital Sky Survey. We show that high stellar mass galaxies (M ∼ 1010.6 M☉) at z ∼0.8 have attained the chemical enrichment seen in the local universe, while lower stellar mass galaxies (M ∼ 109.2 M☉) at z ∼0.8 have lower metallicities (Δlog(O/H) ∼ 0.15 dex) than galaxies at the same stellar mass in the local universe. We find that the LZ relation evolves in both metallicity and B-band luminosity between z ∼0.8 and z ∼ 0, with the B-band luminosity evolving as a function of stellar mass. We emphasize that the B-band luminosity should not be used as a proxy for stellar mass in chemical evolution studies of star-forming galaxies. Our study shows that both the metallicity evolution and the B-band luminosity evolution for emission-line galaxies between the epochs are a function of stellar mass, consistent with the cosmic downsizing scenario of galaxy evolution.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/24edaa8e26a3fb6ffc6aca7815fc7032af6cd1b9

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In Astronomy and Astrophysics

  1. Lisa J. Kewley
  2. M. Dopita
  3. T. Yuan
  4. M. Akiyama
  5. C. Maier
  6. K. Ohta
  7. K. Yabe
  8. L. Hernquist

In Instrumentation

  1. Lisa J. Kewley
  2. T. Yuan
  3. M. Dopita
  4. M. Akiyama
  5. Margaret J. Geller
  6. Sara L. Ellison
  7. David R. Patton
  8. Christy A. Tremonti

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