论文标题
Almaquest调查：V。KPC规模的星星形成关系的非宇宙性及其驱动它们的因素
The ALMaQUEST Survey: V. The non-universality of kpc-scale star formation relations and the factors that drive them
论文作者
论文摘要
使用来自Alma-Manga淬火和恒星形成（Almaquest）的28个星系中的约15,000 kPC规模的恒星形成型Spaxels（Almaquest）调查，我们研究了“解决的” Schmidt-kenniCutt Relation的星系到脉冲变化（RSK; rsk; sigma_h2-sigma_h2-sigma_s sigma_s''s。 （rsfms; sigma_* - sigma_sfr）和`分子气体主序（rmgms; sigma_* -sigma_h2）。 RSK的关系，RSFM和RMGM都显示出形状和归一化的星系 - 到达式变化显着，表明这些关系都不是星系之间的普遍性。 RSFM显示出最大的星系到甘马度变化，而RMGMS最少。通过定义平均关系的“偏移”，我们计算每个星系的Delta_rsk，delta_rsfms，delta_rmgms，以研究与全局属性的相关性。我们发现以下具有至少2个Sigma意义的相关性：RSK在具有较高M_*，较大的Sersic指数和较低特异性SFR（SSFR）的星系中较低（即较低的星形形成效率）； RSFM较低（即较低的SSFR）在具有较高M_*和较大的鼠标索引的星系中； RMGM较低（即较低的SSFR的星系中的气体分数）。在所有15,000个数据点的合奏中，与RSFMS中较大的散射和较弱的相关性相比，RSK关系和RMGMS显示出同样紧密的散射和强相关系数。此外，虽然样本中的delta_rsk和delta_rmgms之间没有相关性，但Galaxy的RSFM的偏移确实与其他两个偏移相关。因此，我们的结果表明，RSK和RMGM是独立的关系，而RSFMS是它们组合的结果。
Using a sample of ~15,000 kpc-scale star-forming spaxels in 28 galaxies drawn from the ALMA-MaNGA QUEnching and STar formation (ALMaQUEST) survey, we investigate the galaxy-to-galaxy variation of the `resolved' Schmidt-Kennicutt relation (rSK; Sigma_H2 - Sigma_SFR), the `resolved' star forming main sequence (rSFMS; Sigma_* - Sigma_SFR) and the `resolved' molecular gas main sequence (rMGMS; Sigma_* - Sigma_H2). The rSK relation, rSFMS and rMGMS all show significant galaxy-to-galaxy variation in both shape and normalization, indicating that none of these relations is universal between galaxies. The rSFMS shows the largest galaxy-to-galaxy variation and the rMGMS the least. By defining an `offset' from the average relations, we compute a Delta_rSK, Delta_rSFMS, Delta_rMGMS for each galaxy, to investigate correlations with global properties. We find the following correlations with at least 2 sigma significance: the rSK is lower (i.e. lower star formation efficiency) in galaxies with higher M_*, larger Sersic index and lower specific SFR (sSFR); the rSFMS is lower (i.e. lower sSFR) in galaxies with higher M_* and larger Sersic index; the rMGMS is lower (i.e. lower gas fraction) in galaxies with lower sSFR. In the ensemble of all 15,000 data points, the rSK relation and rMGMS show equally tight scatters and strong correlation coefficients, compared with a larger scatter and weaker correlation in the rSFMS. Moreover, whilst there is no correlation between Delta_rSK and Delta_rMGMS in the sample, the offset of a galaxy's rSFMS does correlate with both of the other two offsets. Our results therefore indicate that the rSK and rMGMS are independent relations, whereas the rSFMS is a result of their combination.
