A SINFONI integral field spectroscopy survey for galaxy counterparts to damped Lyman α systems – I. New detections and limits for intervening and associated absorbers*
A SINFONI integral field spectroscopy survey for galaxy counterparts to damped Lyman α systems – I. New detections and limits for intervening and associated absorbers*
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针对星系单元到阻尼莱曼 α 系统的 SINFONI 积分场光谱调查 – I. 干预和相关吸收体的新检测和限制*
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发表时间：
2010
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通讯作者：
Italy.
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作者：
C. Péroux;N. Bouché;V. Kulkarni;D. York;Giovanni Vladilo Observatoire Astronomique de Marseille;F. E. U. S. Barbara;Usa Univ. of South Carolina;U. Chicago;U. Trieste;Italy.
对阻尼和亚阻尼莱曼α系统（DLAs）的详细研究依赖于用更传统的方法确定吸收体的星系。积分场光谱学提供了一种有效的方法来探测明亮类星体附近的微弱星系，进一步提供立即的红移确认。在这里，我们报告的检测H α发射从DLA和一个子DLA星系之间的样本六个干预类星体吸收目标。我们导出F（H α）= 7.7 +/- 2.7 × 10（-17）erg s（-1）cm（-2）（SFR = 1.8 +/-0.6 M（圆点）yr（-1）），撞击参数B = 25 kpc，朝向类星体Q 0302 - 223，对于DLA，z（abs）= 1.009，F（H alpha）= 17.1 +/- 6.0 x 10（-17）erg s（-1）cm（-2）（SFR = 2.9 +/-1.0 M（圆点）yr（-1）），B = 39 kpc，朝向Q1009 - 0026，z（abs）= 0.887时，亚DLA。这些结果与以前文献中报道的类星体吸收体的低星星形成率一致。我们使用的[N II] λ 6585/H α的比率，以获得H II发射金属丰度和比较它们与中性气体HI吸收金属丰度来自高分辨率光谱。在一种情况下，实际上发现吸收金属度高于发射线金属度。对于其余的物体，我们实现了F（H α）级的3 σ极限通量，类似于10（-17）erg s（-1）cm（-2）（对应于SFR类似于0.1 M圆点yr（-1）在z类似于1和类似于1 M圆点yr（-1）在z类似于2），即在地面观测中可能的最低值之一。我们还介绍了另外两个星系与C IV系统和偶然发现在我们的数据。
Detailed studies of damped and sub-damped Lyman alpha systems (DLAs), the galaxies probed by the absorption they produce in the spectra of background quasars, rely on identifying the galaxy responsible for the absorber with more traditional methods. Integral field spectroscopy provides an efficient way of detecting faint galaxies near bright quasars, further providing immediate redshift confirmation. Here, we report the detection of H alpha emission from a DLA and a sub-DLA galaxy among a sample of six intervening quasar absorbers targeted. We derive F(H alpha) = 7.7 +/- 2.7 x 10(-17) erg s(-1) cm(-2) (SFR = 1.8 +/- 0.6M(circle dot) yr(-1)) at impact parameter b = 25 kpc towards quasar Q0302 - 223 for the DLA at z(abs) = 1.009 and F(H alpha) = 17.1 +/- 6.0 x 10(-17) erg s(-1) cm(-2) (SFR = 2.9 +/- 1.0M(circle dot) yr(-1)) at b = 39 kpc towards Q1009 - 0026 for the sub-DLA at z(abs) = 0.887. These results are in line with low star formation rates previously reported in the literature for quasar absorbers. We use the [N II]lambda 6585/H alpha ratio to derive the H II emission metallicities and compare them with the neutral gas HI absorption metallicities derived from high-resolution spectra. In one case, the absorption metallicity is actually found to be higher than the emission line metallicity. For the remaining objects, we achieve 3 sigma limiting fluxes of the order F(H alpha) similar to 10(-17) erg s(-1) cm(-2) (corresponding to SFR similar to 0.1 M-circle dot yr(-1) at z similar to 1 and similar to 1 M-circle dot yr(-1) at z similar to 2), i.e. among the lowest that have been possible with ground-based observations. We also present two other galaxies associated with C IV systems and serendipitously discovered in our data.