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IMAGES II. A surprisingly low fraction of undisturbed rotating spiral disks at z~0.6: The morpho-kinematical relation 6 Gyrs ago

机译:图像II。令人惊讶的低比例的未受干扰的旋转螺旋   z~0.6的磁盘:6 Gyrs之前的形态运动关系

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摘要

We present a first combined analysis of the morphological and dynamicalproperties for the Intermediate MAss Galaxy Evolution Sequence (IMAGES) sample.It is a representative sample of 52 z~0.6 galaxies with Mstell from 1.5 to 1510^10Msun and possessing 3D resolved kinematics and HST deep imaging in atleast two broad band filters. We aim at evaluate robustly the evolution ofrotating spirals since z~0.6, as well as to test the different schemes forclassifying galaxies morphologically. We used all the information provided bymulti-band images, color maps and 2 dimensional light fitting to assign to eachobject a morphological class. We divided our sample between spiral disks,peculiar objects, compact objects and mergers. Using our morphologicalclassification scheme, 4/5 of identified spirals are rotating disks and morethan 4/5 of identified peculiar galaxies show complex kinematics, whileautomatic classification methods such as Concentration-Asymmetry and GINI-M20severely overestimate the fraction of relaxed disk galaxies. Using thismethodology, we find that the fraction of rotating spirals has increased by afactor ~ 2 during the last 6 Gyrs, a much higher fraction that found previouslybased on morphologies alone. These rotating spiral disks are forming stars veryrapidly, doubling their stellar masses over the last 6 Gyrs, while most oftheir stars have been formed few Gyrs earlier, which reveals the presence of alarge gas supply. Because they are likely the progenitors of local spirals, wecan conjecture how their properties are evolving. Their disks show someevidence for an inside-out growth and the gas supply/accretion is not maderandomly as the disk need to be stable in order to match the local diskproperties.
机译:我们首次对中间MAss星系演化序列(IMAGES)样本的形态和动力学性质进行了综合分析,它是52个z〜0.6星系的代表性样本,其Mstell从1.5到1510 ^ 10Msun,具有3D解析的运动学和HST深度在至少两个宽带滤波器中成像。我们旨在稳健地评估自z〜0.6以来的旋转旋涡的演变,并测试形态上分类星系的不同方案。我们使用多波段图像,彩色图和二维光拟合提供的所有信息为每个对象分配一个形态学类别。我们将样本分为螺旋盘,特殊对象,紧凑对象和合并。使用我们的形态学分类方案,发现的4/5的螺旋形是旋转盘,超过4/5的特定的星系显示出复杂的运动学,而自动分类方法(例如浓度-不对称性和GINI-M20)则严重高估了松弛盘状星系的比例。使用这种方法,我们发现在最后的6个Gyrs内,旋转螺旋的比例增加了约2倍,这是以前仅基于形态学发现的比例高得多。这些旋转的螺旋盘正在迅速形成恒星,在过去的6个Gyrs内其恒星质量翻了一番,而大多数恒星在更早的几个Gyrs上就形成了,这表明存在大量的天然气。因为它们可能是局部螺旋的祖先,所以我们可以推测它们的性质如何演变。他们的磁盘显示出由内而外增长的证据,并且气体供应/吸气不是随机的,因为磁盘需要稳定才能匹配本地磁盘属性。

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