论文标题
恒星形成历史在HII星系的SFR-M关系中的影响
The effects of star formation history in the SFR-M relation of HII galaxies
论文作者
论文摘要
我们讨论假设不同的恒星形成历史（SFH）在恒星形成速率（SFR）与光谱能量分布拟合（SED）质量之间的关系中的含义。我们的分析着重于HII星系样本，矮星星系在SDSS DR13中以Z <0.4的强烈窄发射线进行了矮starburst星系，并与来自Galex，SDSS，Ukidss和Wise的光度计目录交叉匹配。我们对SED进行了建模并与COGALE一起使用SFH的不同描述。通过添加来自不同独立研究的信息，我们发现HII星系最好由情节性SFH来描述，其中包括旧的（10 Gyr），中级年龄（100-1000 MYR）和最近的人口小于10 MYR。 HII星系与本地恒星形成星系的SFR-M关系一致，并且仅当采用当前SFR而不是整个SFH的平均值时，才是超过这种关系。 SFR-M证明并不是提供有关HII星系SFH的其他信息的好工具，因为不同的SFH呈现出类似的行为，传播<0.1 DEX。
We discuss the implications of assuming different star formation histories (SFH) in the relation between star formation rate (SFR) and mass derived by the spectral energy distribution fitting (SED). Our analysis focuses on a sample of HII galaxies, dwarf starburst galaxies spectroscopically selected through their strong narrow emission lines in SDSS DR13 at z<0.4, cross-matched with photometric catalogs from GALEX, SDSS, UKIDSS and WISE. We modeled and fitted the SEDs with the code CIGALE adopting different descriptions of SFH. By adding information from different independent studies we find that HII galaxies are best described by episodic SFHs including an old (10 Gyr), an intermediate age (100-1000 Myr) and a recent population with ages < 10 Myr. HII galaxies agree with the SFR-M relation from local star-forming galaxies, and only lie above such relation when the current SFR is adopted as opposed to the average over the entire SFH. The SFR-M demonstrated not to be a good tool to provide additional information about the SFH of HII galaxies, as different SFH present a similar behavior with a spread of <0.1 dex.
