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arXiv 1802.08451astro-ph.GA
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用MUSE观测z ~1强透镜星系的动力学、Turbulence和恒星形成

Kinematics, Turbulence and Star Formation of z ~1 Strongly Lensed Galaxies seen with MUSE

V. Patricio, J. Richard, D. Carton, T. Contini, B. Epinat, J. Brinchmann, K. B. Schmidt, D. Krajnovic, N. Bouche, P. M. Weilbacher, R. Pello, J. Caruana, M. Mas… 展开作者

V. Patricio, J. Richard, D. Carton, T. Contini, B. Epinat, J. Brinchmann, K. B. Schmidt, D. Krajnovic, N. Bouche, P. M. Weilbacher, R. Pello, J. Caruana, M. Maseda, H. Finley, F. E. Bauer, J. Martinez, G. Mahler, D. Lagattuta, B. Clement, G. Soucail, L. Wisotzki

摘要:

我们分析了用MUSE观测到的8个红移为0.6<z<1.5的高倍放大星系样本,探讨了这些星系在亚千秒差距尺度下的分辨特性。结合多波段HST测光和MUSE光谱,我们从多条星云谱线中计算了恒星质量、恒星形成率、消光和金属丰度,认为我们的样本是z~1恒星形成星系的代表。我们从[OII]发射中推导出这些星系的2D运动学,并用一种新的方法对其进行建模,该方法考虑了透镜效应并同时适合多个图像。我们使用这些模型来计算2D光束拖尾校正并推导出固有速度色散图。我们发现它们是相当均匀的,相对恒定的速度分散在15 - 80 km/s之间,基尼系数<0.3。我们没有发现任何证据表明,在明亮的恒星形成团块的位置较高(或较低)的速度色散。我们从样本中的两个物体的发射线得出尘埃衰减和衰减校正的恒星形成率的解析图。我们利用这些信息来研究恒星形成率和速度色散之间的关系。我们发现,这些数量是不相关的,和相对较低的恒星形成密度的高速色散似乎表明,在sub-kiloparsec尺度,在高Z光盘湍流主要是由引力不稳定性,而不是恒星反馈。

英文摘要:

We analyse a sample of 8 highly magnified galaxies at redshift 0.6<z<1.5 observed with MUSE, exploring the resolved properties of these galaxies at sub-kiloparsec scales. Combining multi-band HST photometry and MUSE spectra, we derive the stellar mass, global star formation rates, extinction and metallicity from multiple nebular lines, concluding that our sample is representative of z~1 star-forming galaxies. We derive the 2D kinematics of these galaxies from the [OII] emission and model it with a new method that accounts for lensing effects and fits multiple images simultaneously. We use these models to calculate the 2D beam-smearing correction and derive intrinsic velocity dispersion maps. We find them to be fairly homogeneous, with relatively constant velocity dispersions between 15 - 80 km/s and Gini coefficient of <0.3. We do not find any evidence for higher (or lower) velocity dispersions at the positions of bright star-forming clumps. We derive resolved maps of dust attenuation and attenuation-corrected star formation rates from emission lines for two objects in the sample. We use this information to study the relation between resolved star formation rate and velocity dispersion. We find that these quantities are not correlated, and the high-velocity dispersions found for relatively low star-forming densities seems to indicate that, at sub-kiloparsec scales, turbulence in high-z discs is mainly dominated by gravitational instability rather than stellar feedback.

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