%0 Generic %1 gao2017sample %A Gao, Yulong %A Lian, Jianhui %A Kong, Xu %A Lin, Zesen %A Hu, Ning %A Liu, Haiyang %A Wang, Enci %A Cao, Zihuang %A Hou, Yonghui %A Wang, Yuefei %A Zhang, Yong %D 2017 %K galaxies metal poor %T A sample of metal-poor galaxies identified from the LAMOST spectral survey %U http://arxiv.org/abs/1701.01011 %X We present a sample of 48 metal-poor galaxies at $ z < 0.14$ selected from 92,510 galaxies in the LAMOST survey. These galaxies are identified for their detection of the auroral emission line øiii$łambda$4363 above $3\sigma$ level, which allows a direct measurement of the electron temperature and the oxygen abundance. The emission line fluxes are corrected for internal dust extinction using Balmer decrement method. With electron temperature derived from øiii$łambdałambda4959,5007/øiiiłambda4363$ and electron density from $\siiłambda6731/\siiłambda6717$, we obtain the oxygen abundances in our sample which range from $\zoh= 7.63$ (0.09 $\Zsun$) to $8.46$ (0.6 $\Zsun$). We find an extremely metal-poor galaxy with $\zoh=7.63 0.01$. With multiband photometric data from FUV to NIR and $\ha$ measurements, we also determine the stellar masses and star formation rates, based on the spectral energy distribution fitting and $\ha$ luminosity, respectively. We find that our galaxies have low and intermediate stellar masses with $6.39 łe log(M/M_\sun)9.27$, and high star formation rates (SFRs) with $-2.18 log(SFR/M_\sun yr^-1) 1.95$. We also find that the metallicities of our galaxies are consistent with the local $T_e$-based mass-metallicity relation, while the scatter is about 0.28 dex. Additionally, assuming the coefficient of $=0.66$, we find most of our galaxies follow the local mass-metallicity-SFR relation, while a scatter about 0.24 dex exists, suggesting the mass-metallicity relation is weakly dependent on SFR for those metal-poor galaxies.

@misc{gao2017sample, abstract = {We present a sample of 48 metal-poor galaxies at $ z < 0.14$ selected from 92,510 galaxies in the LAMOST survey. These galaxies are identified for their detection of the auroral emission line \oiii$\lambda$4363 above $3\sigma$ level, which allows a direct measurement of the electron temperature and the oxygen abundance. The emission line fluxes are corrected for internal dust extinction using Balmer decrement method. With electron temperature derived from \oiii$\lambda\lambda4959,5007/\oiii\lambda4363$ and electron density from $\sii\lambda6731/\sii\lambda6717$, we obtain the oxygen abundances in our sample which range from $\zoh= 7.63$ (0.09 $\Zsun$) to $8.46$ (0.6 $\Zsun$). We find an extremely metal-poor galaxy with $\zoh=7.63 \pm 0.01$. With multiband photometric data from FUV to NIR and $\ha$ measurements, we also determine the stellar masses and star formation rates, based on the spectral energy distribution fitting and $\ha$ luminosity, respectively. We find that our galaxies have low and intermediate stellar masses with $\rm 6.39 \le log(M/M_{\sun})\le 9.27$, and high star formation rates (SFRs) with $\rm -2.18 \le log(SFR/M_{\sun} yr^{-1}) \le 1.95$. We also find that the metallicities of our galaxies are consistent with the local $T_e$-based mass-metallicity relation, while the scatter is about 0.28 dex. Additionally, assuming the coefficient of $\rm \alpha =0.66$, we find most of our galaxies follow the local mass-metallicity-SFR relation, while a scatter about 0.24 dex exists, suggesting the mass-metallicity relation is weakly dependent on SFR for those metal-poor galaxies.}, added-at = {2017-01-05T12:06:20.000+0100}, author = {Gao, Yulong and Lian, Jianhui and Kong, Xu and Lin, Zesen and Hu, Ning and Liu, Haiyang and Wang, Enci and Cao, Zihuang and Hou, Yonghui and Wang, Yuefei and Zhang, Yong}, biburl = {https://www.bibsonomy.org/bibtex/2f788c2ebc367f197d4629aa53248f35a/miki}, description = {[1701.01011] A sample of metal-poor galaxies identified from the LAMOST spectral survey}, interhash = {6ff1f98d89020a4c65a935a6e7dbd83b}, intrahash = {f788c2ebc367f197d4629aa53248f35a}, keywords = {galaxies metal poor}, note = {cite arxiv:1701.01011Comment: 17 pages, 6 figures, 1 table, accepted to RAA}, timestamp = {2017-01-05T12:06:20.000+0100}, title = {A sample of metal-poor galaxies identified from the LAMOST spectral survey}, url = {http://arxiv.org/abs/1701.01011}, year = 2017 }