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arXiv 1002.3172astro-ph.CO
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局部恒星形成率密度:用[ OII ]、Ha和UV光度评估校准

The local star-formation rate density: assessing calibrations using [OII], Ha and UV luminosities

David G. Gilbank, Ivan K. Baldry, Michael L. Balogh, Karl Glazebrook, Richard G. Bower

摘要:

我们利用斯隆数字巡天(SDSS)更深的275度^2条纹82子样本中的[OII]、Ha和u波段光度,结合银河演化探索者卫星(GALEX)的紫外数据,探索了简单恒星形成率(SFR)指标(例如可用于高红移星系巡天)在本宇宙中的应用。我们研究的一致性,这样的方法使用恒星形成率密度(SFRD)作为恒星质量的函数,在这个地方的体积,并量化的准确性,对各种指标的尘埃和金属丰度的校正。静止帧U波段有望成为一个特别好的SFR估计高红移的研究,因为它不需要一个特别大或敏感的消光校正,但产生的结果广泛一致的观测更昂贵的方法。我们认为,[OII]衍生的SFR,通常用于较高的红移(z~1),可以用来可靠地估计SFR的星系系综,但对于高质量星系(log(M*/Msun)>10),一个更大的校正比通常使用的是需要补偿的影响,金属丰度依赖和尘埃消光。我们为[OII]-SFR提供了一个新的经验质量相关校正。

英文摘要:

We explore the use of simple star-formation rate (SFR) indicators (such as may be used in high-redshift galaxy surveys) in the local Universe using [OII], Ha, and u-band luminosities from the deeper 275 deg^2 Stripe 82 subsample of the Sloan Digital Sky Survey (SDSS) coupled with UV data from the Galaxy Evolution EXplorer satellite (GALEX). We examine the consistency of such methods using the star-formation rate density (SFRD) as a function of stellar mass in this local volume, and quantify the accuracy of corrections for dust and metallicity on the various indicators. Rest-frame u-band promises to be a particularly good SFR estimator for high redshift studies since it does not require a particularly large or sensitive extinction correction, yet yields results broadly consistent with more observationally expensive methods. We suggest that the [OII]-derived SFR, commonly used at higher redshifts (z~1), can be used to reliably estimate SFRs for ensembles of galaxies, but for high mass galaxies (log(M*/Msun)>10), a larger correction than is typically used is required to compensate for the effects of metallicity dependence and dust extinction. We provide a new empirical mass-dependent correction for the [OII]-SFR.

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