Lurking systematics in predicting galaxy cold gas masses using dust luminosities and star formation rates
Lurking systematics in predicting galaxy cold gas masses using dust luminosities and star formation rates
复制标题
利用尘埃光度和恒星形成率预测星系冷气体质量的潜伏系统
DOI：
10.1093/mnras/sty242
复制
发表时间：
2018
影响因子：
4.8
通讯作者：
A. Goodwin
中科院分区：
文献类型：
--
作者：
S. Janowiecki;L. Cortese;B. Catinella;A. Goodwin
我们使用赫歇尔参考巡天中的星系来评估冷气体质量的常用间接预测因子。我们使用红外尘埃发射和气体耗尽时间方法来校准冷中性原子和分子气体的预测，这些方法是自洽的并且具有约 20% 的准确度（在总冷气体质量的预测中具有最高的准确度）。然而，在所有校准中都发现了适度的系统残差依赖性，这些校准取决于分子气体和原子气体之间的分配，并且可以高估/低估气体质量高达 0.3dex。正如预期的那样，基于尘埃的估计最适合预测总气体质量，而基于耗尽时间的估计只能预测（恒星形成）分子气体质量。此外，我们建议在将这些预测应用于高 z 星系时要小心，因为当对主要气相做出错误的假设时，可能会出现显着的（0.5dex 或更多）错误。使用预测的气体质量导出的任何标度关系可能与所使用的校准的相关性比与实际观测的星系的相关性更密切。
We use galaxies from the Herschel Reference Survey to evaluate commonly used indirect predictors of cold gas masses. We calibrate predictions for cold neutral atomic and molecular gas using infrared dust emission and gas depletion time methods which are self-consistent and have ~20% accuracy (with the highest accuracy in the prediction of total cold gas mass). However, modest systematic residual dependences are found in all calibrations which depend on the partition between molecular and atomic gas, and can over/under-predict gas masses by up to 0.3dex. As expected, dust-based estimates are best at predicting the total gas mass while depletion time-based estimates are only able to predict the (star-forming) molecular gas mass. Additionally, we advise caution when applying these predictions to high-z galaxies, as significant (0.5dex or more) errors can arise when incorrect assumptions are made about the dominant gas phase. Any scaling relations derived using predicted gas masses may be more closely related to the calibrations used than to the actual galaxies observed.
DOI：
10.1088/0004-637x/768/1/74
发表时间：
2012-11
期刊：
The Astrophysical Journal
影响因子：
--
作者：
L. Tacconi;R. Neri;R. Genzel;F. Combes;A. Bolatto;M. Cooper;S. Wuyts;F. Bournaud;A. Burkert-
通讯作者：
L. Tacconi;R. Neri;R. Genzel;F. Combes;A. Bolatto;M. Cooper;S. Wuyts;F. Bournaud;A. Burkert-