FDF和WHDF中场早型Galerkin的演化
The Evolution of Field Early-Type Galaxies in the FDF and WHDF
摘要：
我们利用从FORS深场和William Herschel深场中提取的样本，研究了从0.20<z<0.75到M_B<=-19.30的24个场早型星系的性质。高信噪比的中分辨率VLT光谱学由深高分辨率HST/ACS成像和额外的地基多波段测光补充。为了澄清在一些星系中检测到的低水平的恒星形成（SF），我们使用钱德拉和XMM-牛顿X射线巡天的存档数据来确定我们样本中活动星系核活动的数量。B和K波段Faber-Jackson关系和基本面显示了场早型星系的中等演化。透镜状（S 0）星系的平均特征是更强的光度演化和更蓝的静止框架颜色，这可以解释为与椭圆星系相比，它们包含更多样的恒星星族。FP的演化可以解释为我们星系动态质光比的平均变化：<Δ \log{(M/L_B)} /z>=-0.74 \pm 0.08。这些场星系的M/L演化表明，在最后5 Gyr的场早型星系的连续质量组装，得到了最近的研究支持的场星系z~1。最近SF活动的独立证据是由光谱（OII em.，HDdelta）和光度（静止帧颜色）诊断。基于H δ吸收特征，我们检测到一个微弱的剩余SF的星系，占这些星系的总恒星质量的5%-10%。我们星系的光度和质量的共同演化有利于缩小形成过程。我们发现一些证据表明，我们的星系经历了一段时间的SF淬火，可能触发活动星系核活动，这是在很好的协议与最近的结果在观测和理论方面。（节略）
英文摘要：
We explore the properties of 24 field early-type galaxies at 0.20<z<0.75 down to M_B<=-19.30 in a sample extracted from the FORS Deep Field and the William Herschel Deep Field. High S/N intermediate-resolution VLT spectroscopy was complemented by deep high-resolution HST/ACS imaging and additional ground-based multi-band photometry. To clarify the low level of star formation (SF) detected in some galaxies, we identify the amount of AGN activity in our sample using archive data of Chandra and XMM-Newton X-ray surveys. The B and K-band Faber-Jackson relations and the Fundamental Plane display a moderate evolution for the field early-type galaxies. Lenticular (S0) galaxies feature on average a stronger luminosity evolution and bluer rest-frame colours which can be explained that they comprise more diverse stellar populations compared to elliptical galaxies. The evolution of the FP can be interpreted as an average change in the dynamical mass-to-light ratio of our galaxies as <Δ\log{(M/L_B)}/z>=-0.74\pm0.08. The M/L evolution of these field galaxies suggests a continuous mass assembly of field early-type galaxies during the last 5 Gyr, that gets support by recent studies of field galaxies up to z~1. Independent evidence for recent SF activity is provided by spectroscopic (OII em., Hdelta) and photometric (rest-frame colors) diagnostics. Based on the Hdelta absorption feature we detect a weak residual SF for galaxies that accounts for 5%-10% in the total stellar mass of these galaxies. The co-evolution in the luminosity and mass of our galaxies favours a downsizing formation process. We find some evidence that our galaxies experienced a period of SF quenching, possible triggered by AGN activity that is in good agreement with recent results on both observational and theoretical side. (abridged)
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