科研之友
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摘要
We present a sample of 22 blue [(B-V)(AB) < 0.45], luminous (M-B,M- (AB) < -18.9), metal-poor galaxies in the 0.69< z< 0.88 redshift range, selected from the DEEP2 galaxy redshift survey. Their spectra contain the [OIII]lambda 4363 auroral line, the [OII]lambda lambda 3726, 3729 doublet and the strong nebular [O III]lambda lambda 4959, 5007 emission lines. The ionized gas-phase oxygen abundances of these galaxies lie between 7.62 < 12 + logO/ H < 8.19, i. e., between 1/ 10 Z(circle dot) and 1/ 3Z(circle dot). We find that galaxies in our sample have comparablemetallicities to other intermediate-redshift samples, but are more metal poor than local systems of similar B-band luminosities and star formation activity. The galaxies here show similar properties to the green peas discovered at z similar or equal to 0.2-0.3, though our galaxies tend to be slightly less luminous.
- 出版日期2016-1-21
